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#1
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New Tung- Sol 6550?
So what's this thing, a MM repackaged Sovtek KT88? Might buy a quad for the
pretty boxes. |
#2
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Mark S wrote: So what's this thing, a MM repackaged Sovtek KT88? Might buy a quad for the pretty boxes. The plate is recycled from the Sovtek 6550WE. Of course, the plate is the *least* important part of a tube - anything that can withstand 1100 Kelvin without warping will work just fine, including a tunafish can. The stuff *inside* the plate of the new Reflektor-produciton Tung-Sol 6550 is *excellent*, however. This is a *good* tube, with Gm in the correct range, and it doesn't suffer from bias drift like the SED 6550C all you audiophools seem to be so in love with. The triple getter system is good, too, and will add considerable service lifetime. Botom line: Don't knock it until you've tried it. I have, and it's excellent - at least, in musical instrument amplification. Especially Leslies. Lord Valve Expert |
#3
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François Yves Le Gal wrote: On Thu, 07 Apr 2005 06:57:31 GMT, Lord Valve wrote: it doesn't suffer from bias drift like the SED 6550C all you audiophools seem to be so in love with. Yeah, coming from a Certified ****tard™ who does happen to have majored in bull****ting and who also happens to resell New Sensor products. Why don't you jump back on this special needs tricycle of yours, the one with the two added wheels for extra safety, and ride into oblivion, ****head? Tell you what, froggy - Prove I'm wrong. Otherwise, shove it up your snotty french ass. BTW, I sell the SEDs, too. I don't give a **** which kind people buy - I get paid either way. Figure it out, asswipe. Lord Valve Expert |
#4
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"Lord Valve" wrote in message ... Mark S wrote: So what's this thing, a MM repackaged Sovtek KT88? Might buy a quad for the pretty boxes. The plate is recycled from the Sovtek 6550WE. Of course, the plate is the *least* important part of a tube - anything that can withstand 1100 Kelvin without warping will work just fine, including a tunafish can. The stuff *inside* the plate of the new Reflektor-produciton Tung-Sol 6550 is *excellent*, however. This is a *good* tube, with Gm in the correct range, and it doesn't suffer from bias drift like the SED 6550C all you audiophools seem to be so in love with. The triple getter system is good, too, and will add considerable service lifetime. Botom line: Don't knock it until you've tried it. I have, and it's excellent - at least, in musical instrument amplification. Especially Leslies. Lord Valve Expert I guess I question the marketing. He has a well known & well regarded line of tubes in EH, why spend money on the rights to the Tung Sol & Mullard names, tooling up boxes ect. instead of just improving what he has? Or producting a 7591 with the correct size envelope. I'll probably give a quad a run anyway because, if nothing else, they're kool looking! ) By the way, how are the RM oysters these days? Mark S Jack of all trades, master of none. |
#5
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Lord Valve wrote: François Yves Le Gal wrote: On Thu, 07 Apr 2005 06:57:31 GMT, Lord Valve wrote: it doesn't suffer from bias drift like the SED 6550C all you audiophools seem to be so in love with. Yeah, coming from a Certified ****tard™ who does happen to have majored in bull****ting and who also happens to resell New Sensor products. Why don't you jump back on this special needs tricycle of yours, the one with the two added wheels for extra safety, and ride into oblivion, ****head? Tell you what, froggy - Prove I'm wrong. Otherwise, shove it up your snotty french ass. BTW, I sell the SEDs, too. I don't give a **** which kind people buy - I get paid either way. Figure it out, asswipe. Lord Valve Expert I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. I doubt US - French diplomatic relations will improve much if things get poked where you want to poke them, but we live in hope that a declaration of peace be at least drawn up and laid ready for signature soon. Patrick Turner. |
#6
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I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. Dear Patrick ! I just hope that you can imagine these 3 gals operating 9,600 watts six trays / 40 tubes each "machine" described in a catalogue. Also, note - there is no photo of "machine", just ugly cad drawing. About power tubes matching - who needs 1mA tolerance ? And who will swear that a pair of tubes will be within 1mA after say half of a year period ? In my opinion, method described in NS catalogue must be very expensive. Looking at prices one can think that they are getting tubes from manufacurers for free.. But if they managed to do it as described - my congradulations to NS folks ! But in any case Tung Sol KT66 ??!! sounds strange for my ears.. Best wishes, -- Igor http://www.arrakis.es/~igapop |
#7
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iga wrote: I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. Dear Patrick ! I just hope that you can imagine these 3 gals operating 9,600 watts six trays / 40 tubes each "machine" described in a catalogue. Also, note - there is no photo of "machine", just ugly cad drawing. About power tubes matching - who needs 1mA tolerance ? And who will swear that a pair of tubes will be within 1mA after say half of a year period ? In my opinion, method described in NS catalogue must be very expensive. Looking at prices one can think that they are getting tubes from manufacurers for free.. But if they managed to do it as described - my congradulations to NS folks ! But in any case Tung Sol KT66 ??!! sounds strange for my ears.. Best wishes, -- Igor http://www.arrakis.es/~igapop Well, you can be as sceptical as you like, and sure, the pics of the testing apparatus look a bit inaccurate and animated, and pics of the gals make them look sexier than they probably really are, and a its all a bit frivolous, but then Mike Mathews isn't going to show everyone his trade secrets, now is he? And if you can't understand the tech, then you can drool over tha gals. So he departs from the sombre and dull reporting style of 1959, and just carries on with the modern approach, keep em smiling, and let the tiny minority of customers who are tech heads like myself just keep guessing.. I have had good service from the New Sensor empire. If somebody wants my trade they gotta do it better and cheaper...... And methinks a pair of tubes matched for 1mA difference for the same applied g1 bias will drift less than a pair matched for 5 mA. Then there is gm, and matching for the same gm *and* the same bias current for the same g1 voltage would mean you have to get 2 parameters about a tube to match, rather than only 1. What happens to all the tubes which don't match any other? Well maybe there are not many, and those that cannot be matched fall outside the spec and are binned. All tubes still drift apart as they age, and an octet matched janGE6550A I had in an amp for 5 years sure got a bit different, with +/- 6 v difference in bias needed for the same Ia at idle. This is not a problem if you have a sensibly designed amp with separate fixed bias adjust pots for each tube, or if you have cathode bias for each tube. Doing it any other way is poor engineering imho, and if the best of NOS will drift so wildly as the NOS GE tubes I bought then we have to expect the russian tubes will also drift a fair bit. The info in the catalog provokes me to ask more questions. I'd like to see the close up pics of the tubes as they are made, in particular, I'd like to see the cathode metal etching process, and the way they apply the cathode emissive material, and you'd expect to se some plate curves to assist the designer. New Sensor is rather parsimonious about providing such information, and my guess is that they are not going to change because providing tubes is serious business, but nevertheless a fun thing, and most ppl who buy their tubes for replacements in guitar amps couldn't care less about the plate curves. NS probably think they have the quality control well enough worked out, because so few tubes are returned due to failure due to poor russian workmanship, ( or workwomanship, more likely ). If you want any data, find out about it by doing your own in house testing. I do my own tests, and I bet Audio Research and Conrad Johnson do their own to. Nevertheless, when I emailed NS this week for KT90 curves, they offered to send me a copy by fax, which seems strange because email would be more convenient, and I don't have a fax. They are entitled to do that, so i will arrange for someone to receive their faxed data curves. I find that sovtek KT88, 6550EH KT88EH are exactly the same electronically and the internal construction looks exactly the same, so it seems some rationalisation has gone on for marketing reaons. 6550 and KT88 were once different tubes from different companies, but were made to be interchangable in 90% of amplifiers. OK, if that's the case why have two different tubes? Make em all the same, and just print different numbers on the glass, and everyone still gets a nice tube. When I tested these tubes for gM, Ra, and u, the few samples I chose were virtually identical. I kinda don't feel like complaining because its remarkable we have any tubes being made today; they nearly became extinct! New Sensor would be aware that if they cheapen up the manufacturing process too much the chinese would be delighted. Maybe the chinese will eventually gain a better reputation for quality than the russians but it will take some doing on the part of the chinese, who I feel have some way to go before they consistently outsmart the russians, especially the real Svetlana brand, by making longer lasting tubes with close specs which sound better. There are more chinese than russians, and china is growing at a 4% rate and industry is booming, and methinks its only a matter of time before the new generation pay more than lip service to buyers of tubes, and really make sure quality is adhered to, and learn to understand westerners, and address us in terms better than strangled 'Chininglish', which nobody takes seriously. The penny has yet to really drop with the chinese. So far, so good with New Sensor; I have not had many lemon tubes from them. Don't ask me if the quality of the new Tungsol is any better than a similarly shaped sovtek KT88. I really don't know, and don't ask me if the new Mullards have anthing different to the cheaper old sovtek EL34wxt, except for the better looking larger glass envelope like the original EL34. The price of KT90EH has sagged since it was released last year, and is slightly less than KT88EH, so to me it represents good value, if not top value. But KT90 isn't specified for use in as many amps as KT88 or 6550, so maybe there isn't the demand, so the tube just can't sell in large numbers. But the KT90 can work into a lower RLa-a than KT88, thus producing more power, and it has about 30% higher anode dissipation, lower Ra, and it makes a very nice triode, and you'd think ppl would have demanded more of them, since its basic benefit is greater current ability, which translates to a perhaps better sonic signature, even in a largely class A UL hi-fi amp, where they never get asked to make more than a few watts of all class A most of the time. Afaik, the KT90EH is a better KT90 than the Ei KT90 from yugo, and also afaik, the yugo factory isn't making any tubes.... 6CA7EH are also a tube not as commonly used as the EL34, well, here in Oz this is the case, and if anything, this tube is like a poor man's 6550, rather more rugged and perhaps better than the EL34 than it is equivalant to. So it is also good value. There are at least several more newly made russian tube types being supplied by NS which were not being made last year. This is good news for those who want only NOS from the pre 1985 days, because some ppl will now buy the newly mades instead of the precious and irreplaceable NOS. Patrick Turner. |
#8
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Patrick Turner said:
What happens to all the tubes which don't match any other? Well maybe there are not many, and those that cannot be matched fall outside the spec and are binned. They're sold to guitar players. ;-) -- Sander de Waal " SOA of a KT88? Sufficient. " |
#9
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Hi Patrick !
Sure NS made a lot for tube comunity and the fact that they "now have virtually zero defects for returns" says a lot too. I just don't understand all that jazz with old brand names as Mullard or TungSol etc.. Ah, and I'm dying for just to see as these gals turn "ON" this rig with 240 x 6550s ! Best wishes, Igor http://www.arrakis.es/~igapop "Patrick Turner" escribió en el mensaje ... iga wrote: I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. Dear Patrick ! I just hope that you can imagine these 3 gals operating 9,600 watts six trays / 40 tubes each "machine" described in a catalogue. Also, note - there is no photo of "machine", just ugly cad drawing. About power tubes matching - who needs 1mA tolerance ? And who will swear that a pair of tubes will be within 1mA after say half of a year period ? In my opinion, method described in NS catalogue must be very expensive. Looking at prices one can think that they are getting tubes from manufacurers for free.. But if they managed to do it as described - my congradulations to NS folks ! But in any case Tung Sol KT66 ??!! sounds strange for my ears.. Best wishes, -- Igor http://www.arrakis.es/~igapop Well, you can be as sceptical as you like, and sure, the pics of the testing apparatus look a bit inaccurate and animated, and pics of the gals make them look sexier than they probably really are, and a its all a bit frivolous, but then Mike Mathews isn't going to show everyone his trade secrets, now is he? And if you can't understand the tech, then you can drool over tha gals. So he departs from the sombre and dull reporting style of 1959, and just carries on with the modern approach, keep em smiling, and let the tiny minority of customers who are tech heads like myself just keep guessing.. I have had good service from the New Sensor empire. If somebody wants my trade they gotta do it better and cheaper...... And methinks a pair of tubes matched for 1mA difference for the same applied g1 bias will drift less than a pair matched for 5 mA. Then there is gm, and matching for the same gm *and* the same bias current for the same g1 voltage would mean you have to get 2 parameters about a tube to match, rather than only 1. What happens to all the tubes which don't match any other? Well maybe there are not many, and those that cannot be matched fall outside the spec and are binned. All tubes still drift apart as they age, and an octet matched janGE6550A I had in an amp for 5 years sure got a bit different, with +/- 6 v difference in bias needed for the same Ia at idle. This is not a problem if you have a sensibly designed amp with separate fixed bias adjust pots for each tube, or if you have cathode bias for each tube. Doing it any other way is poor engineering imho, and if the best of NOS will drift so wildly as the NOS GE tubes I bought then we have to expect the russian tubes will also drift a fair bit. The info in the catalog provokes me to ask more questions. I'd like to see the close up pics of the tubes as they are made, in particular, I'd like to see the cathode metal etching process, and the way they apply the cathode emissive material, and you'd expect to se some plate curves to assist the designer. New Sensor is rather parsimonious about providing such information, and my guess is that they are not going to change because providing tubes is serious business, but nevertheless a fun thing, and most ppl who buy their tubes for replacements in guitar amps couldn't care less about the plate curves. NS probably think they have the quality control well enough worked out, because so few tubes are returned due to failure due to poor russian workmanship, ( or workwomanship, more likely ). If you want any data, find out about it by doing your own in house testing. I do my own tests, and I bet Audio Research and Conrad Johnson do their own to. Nevertheless, when I emailed NS this week for KT90 curves, they offered to send me a copy by fax, which seems strange because email would be more convenient, and I don't have a fax. They are entitled to do that, so i will arrange for someone to receive their faxed data curves. I find that sovtek KT88, 6550EH KT88EH are exactly the same electronically and the internal construction looks exactly the same, so it seems some rationalisation has gone on for marketing reaons. 6550 and KT88 were once different tubes from different companies, but were made to be interchangable in 90% of amplifiers. OK, if that's the case why have two different tubes? Make em all the same, and just print different numbers on the glass, and everyone still gets a nice tube. When I tested these tubes for gM, Ra, and u, the few samples I chose were virtually identical. I kinda don't feel like complaining because its remarkable we have any tubes being made today; they nearly became extinct! New Sensor would be aware that if they cheapen up the manufacturing process too much the chinese would be delighted. Maybe the chinese will eventually gain a better reputation for quality than the russians but it will take some doing on the part of the chinese, who I feel have some way to go before they consistently outsmart the russians, especially the real Svetlana brand, by making longer lasting tubes with close specs which sound better. There are more chinese than russians, and china is growing at a 4% rate and industry is booming, and methinks its only a matter of time before the new generation pay more than lip service to buyers of tubes, and really make sure quality is adhered to, and learn to understand westerners, and address us in terms better than strangled 'Chininglish', which nobody takes seriously. The penny has yet to really drop with the chinese. So far, so good with New Sensor; I have not had many lemon tubes from them. Don't ask me if the quality of the new Tungsol is any better than a similarly shaped sovtek KT88. I really don't know, and don't ask me if the new Mullards have anthing different to the cheaper old sovtek EL34wxt, except for the better looking larger glass envelope like the original EL34. The price of KT90EH has sagged since it was released last year, and is slightly less than KT88EH, so to me it represents good value, if not top value. But KT90 isn't specified for use in as many amps as KT88 or 6550, so maybe there isn't the demand, so the tube just can't sell in large numbers. But the KT90 can work into a lower RLa-a than KT88, thus producing more power, and it has about 30% higher anode dissipation, lower Ra, and it makes a very nice triode, and you'd think ppl would have demanded more of them, since its basic benefit is greater current ability, which translates to a perhaps better sonic signature, even in a largely class A UL hi-fi amp, where they never get asked to make more than a few watts of all class A most of the time. Afaik, the KT90EH is a better KT90 than the Ei KT90 from yugo, and also afaik, the yugo factory isn't making any tubes.... 6CA7EH are also a tube not as commonly used as the EL34, well, here in Oz this is the case, and if anything, this tube is like a poor man's 6550, rather more rugged and perhaps better than the EL34 than it is equivalant to. So it is also good value. There are at least several more newly made russian tube types being supplied by NS which were not being made last year. This is good news for those who want only NOS from the pre 1985 days, because some ppl will now buy the newly mades instead of the precious and irreplaceable NOS. Patrick Turner. |
#10
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iga wrote: Hi Patrick ! Sure NS made a lot for tube comunity and the fact that they "now have virtually zero defects for returns" says a lot too. I just don't understand all that jazz with old brand names as Mullard or TungSol etc.. Its marketing. Don't let it worry you. As long as the tubes do the business, who cares what the antics of the business owner are. Ah, and I'm dying for just to see as these gals turn "ON" this rig with 240 x 6550s ! To get 50 watts to each tube, you need to supply 12,000 watts. It sounds like a lot but that's only the equivalent of my domestic hot water system plus a couple ot 2kW room heaters being on. The costs of power are negligible when compared to wages. They would be selling quite a few bottles.... The number appears to be increasing...... Patrick Turner. Best wishes, Igor http://www.arrakis.es/~igapop "Patrick Turner" escribió en el mensaje ... iga wrote: I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. ............ |
#11
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On Sat, 09 Apr 2005 13:10:45 +0200, iga wrote:
I just got the trade catalog from New Sensor, and quite a bit about how they test and match the tubes, to eliminate the duds, and get matching to 1 mA accurate, and with gm ..... Mike Mathews is pictured at the keyboard of a very mouldy old piano, and he has hired three sth american babes to do the tube testing, 40 tubes at a time, all day everyday. Dear Patrick ! I just hope that you can imagine these 3 gals operating 9,600 watts six trays / 40 tubes each "machine" described in a catalogue. Also, note - there is no photo of "machine", just ugly cad drawing. About power tubes matching - who needs 1mA tolerance ? Igor: He visto la maquina en el edificio de New Sensor, esa si existe. Tuve que ir en el tren antiguo de linea 7 y pedir direcciones en el espanol para encontrar su edificio. Esas chicas son modelas, de verdad, los que operaron la maquina son ruquitos dominicanos y puertoriquenos. Creo que las chicas son concubinas de Sr. Matthews. About power tubes matching - who needs 1mA tolerance ? And who will swear that a pair of tubes will be within 1mA after say half of a year period ? Nadie. El unico modo para garantizar que los tubos prueban iguales en todos condiciones es hacer una "curva rastra", pero de todos modos hay que "tolerancia" de cualquier porcentaje, o casi ningun va a salir igual. Pero, casi los peores de los tubos salen mas igual que los transistores! Debes medir una bolsa de transistores, el "beta gain" tipicamente sale como -80 +200% o peor! In my opinion, method described in NS catalogue must be very expensive. No sea muy caro. Un ruquito mantiene una maquina que prueba cienes de tubos. Muchas gracias de su ayuda, le debo por lo menos una botella o algo. Tengo ganas de rastrar mi esposa a una vacacion, como hace el tiempo en Bilbao? -- Ned Carlson Triode Electronics Chicago,IL USA www.triodeelectronics.com |
#12
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Euzkadi es una de las regiones más agradables de Europa. Bilbao es una ciudad industrial, muy interesante, pero no una ciudad de vacaciones. Nope ! Asi era hace 15 años. Ahora no hay industria practicamente, han serrado practicamente todo. Desde que han construido Guggenheim, Euscalduna Palace and now Bilbao Exibition Centre - la ciudad esta llena de turistas ( ingleses e alemanes principalmente, pero hay muchos franseses tambien ) Y en terminos de turismo rural Pais Vasco es insuperable. Un saludo, -- Igor http://www.arrakis.es/~igapop |
#13
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Hola Ned !
Muchas gracias por la informacion ! Lo del tiempo en Bilbao - nunca se sabe. Esta serca del mar y el tiempo se cambia en cuestion de horas. Ahora mismo son 15ºC, sol y un poco de viento... Pero para uno de Chicago el viento no es nada nuevo, no ? Bueno, espero que nos veremos en Bilbao. Un saludo, -- Igor http://www.arrakis.es/~igapop "Ned Carlson" escribió en el mensaje news On Sat, 09 Apr 2005 13:10:45 +0200, iga wrote: Igor: He visto la maquina en el edificio de New Sensor, esa si existe. Tuve que ir en el tren antiguo de linea 7 y pedir direcciones en el espanol para encontrar su edificio. Esas chicas son modelas, de verdad, los que operaron la maquina son ruquitos dominicanos y puertoriquenos. Creo que las chicas son concubinas de Sr. Matthews. About power tubes matching - who needs 1mA tolerance ? And who will swear that a pair of tubes will be within 1mA after say half of a year period ? Nadie. El unico modo para garantizar que los tubos prueban iguales en todos condiciones es hacer una "curva rastra", pero de todos modos hay que "tolerancia" de cualquier porcentaje, o casi ningun va a salir igual. Pero, casi los peores de los tubos salen mas igual que los transistores! Debes medir una bolsa de transistores, el "beta gain" tipicamente sale como -80 +200% o peor! In my opinion, method described in NS catalogue must be very expensive. No sea muy caro. Un ruquito mantiene una maquina que prueba cienes de tubos. Muchas gracias de su ayuda, le debo por lo menos una botella o algo. Tengo ganas de rastrar mi esposa a una vacacion, como hace el tiempo en Bilbao? -- Ned Carlson Triode Electronics Chicago,IL USA www.triodeelectronics.com |
#14
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"François Yves Le Gal" escribió en el mensaje ... On Wed, 13 Apr 2005 13:00:47 +0200, "iga" wrote: Asi era hace 15 años. Ahora no hay industria practicamente, han serrado practicamente todo. Hmmm, no diría eso. Si los muchos de industrias se han cerrado, Bilbao es más como Liverpool o cualquier ciudad industrial europea. Man ! Hace 15 años habia cantidad de fabricas funcionando dentro de la ciudad, el paseo maritimo no existia y la ria tenia color verde "electric" y olia fatal. Los altos hornos estaban ahi todavia.. Como ya te he dicho todo esta serrado. Estan a punto de serrar los ultimos astilleros ( estan sin trabajo desde hace años - todos los barcos se hacen en Korea ahora ). La idea fue convertir Bilbao a una ciudad de servicio. De momento funcciona. la ciudad esta llena de turistas Vienen para un par de días, no por una semana o más. Que tiene esto de malo ? Cuando voy a Paris - voy para 2 - 3 dias, no mas. Y en terminos de turismo rural Pais Vasco es insuperable. Convenido. Tierra, mar, montañas, cultura, historia. Euzkadi es un lugar maravilloso a las vacaciones o vive. Paso algunos meses cada año en Bidarte, norte del Bidassoa. :-) Un saludo, -- Igor http://www.arrakis.es/~igapop |
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