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#1
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KT88 or KT90 for scratch built bass amp???
Anyone care to comment on which tube would be "better" for a high powered bass
amp? By "better", I mean more reliable when abused. You know how we bassists are! I've been wanting to try my hand at building a high powered all tube bass amp, but I figure someone else's experiences will help save me a lot of time and money. I've built a few bass amps in the 100 to 200 Watt range, but I'd like to take things up a few notches. And if I'm happy with the results, MAYBE I might actually make a few for sale... But I sure as heck couldn't call them "Mitchell Amps". People might think I'm the "other" Tom Mitchell that made amps in Riverside, California back when I was still in High School, and then people would expect me to FIX all those bargain-basement Boogie clones... By all means, POST your response, but PLEASE respond by EMAIL too! I;m only drop in to this newsgroup two or three times a month. Best regards, Tom Mitchell website - http://members.aol.com/ecc81 website - http://www.over-reactors.com |
#2
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Phooey. A tube BASS amp needs to be a general purpose power amplifier,
not a guitar amplifier. Study true classics like the Altec 260B, 1570B, Mac MI200, and other audio amplifiers using real power tubes,211s, 811s,812s, and up-look at a Varian Eimac catalog. If it does not have at least 1200 vdc on the plates I am not interested at all. |
#3
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Sam Byrams wrote: Phooey. A tube BASS amp needs to be a general purpose power amplifier, not a guitar amplifier. Study true classics like the Altec 260B, 1570B, Mac MI200, and other audio amplifiers using real power tubes,211s, 811s,812s, and up-look at a Varian Eimac catalog. If it does not have at least 1200 vdc on the plates I am not interested at all. Play much on the road? I didn't think so. LV |
#4
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Hi RATs!
Flinging =C= 6550 are really pretty decent for cheaper than the oh so trendy KT posers Tubes is great, but, all bidness is a racket Happy Ears! Al Alan J. Marcy Phoenix, AZ PWC/mystic/Earhead |
#5
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----- Original Message ----- From: "Jon Yaeger" Newsgroups: rec.audio.tubes Sent: Saturday, July 03, 2004 2:29 PM Subject: KT88 or KT90 for scratch built bass amp??? : What happens when you spill beer into an amp with 1200 V on the plates??? : : - j I was working as an amp janitor at a music store when I accidentialy spilled a coke into a twin reverb while the deck was sitting on top of the speaker/case. It broke into oscillation and I turned it off quickly. Once the wet dried up it worked perfectly. I did not charge the guy extra for that. Phil Abbate |
#6
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Sam Byrams wrote: Phooey. A tube BASS amp needs to be a general purpose power amplifier, not a guitar amplifier. Study true classics like the Altec 260B, 1570B, Mac MI200, and other audio amplifiers using real power tubes,211s, 811s,812s, and up-look at a Varian Eimac catalog. If it does not have at least 1200 vdc on the plates I am not interested at all. Imagination goes a long way, but then electrocution sets in!!!!!! JLS |
#7
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What happens when you spill beer into an amp with 1200 V on the plates???
- j From: Lord Valve Organization: EarthLink Inc. -- http://www.EarthLink.net Newsgroups: rec.audio.tubes Date: Sat, 03 Jul 2004 05:58:10 GMT Subject: KT88 or KT90 for scratch built bass amp??? Sam Byrams wrote: Phooey. A tube BASS amp needs to be a general purpose power amplifier, not a guitar amplifier. Study true classics like the Altec 260B, 1570B, Mac MI200, and other audio amplifiers using real power tubes,211s, 811s,812s, and up-look at a Varian Eimac catalog. If it does not have at least 1200 vdc on the plates I am not interested at all. Play much on the road? I didn't think so. LV |
#8
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Jon Yaeger wrote in message ...
What happens when you spill beer into an amp with 1200 V on the plates??? - j It it cold beer or warm. K. L. From: Lord Valve Organization: EarthLink Inc. -- http://www.EarthLink.net Newsgroups: rec.audio.tubes Date: Sat, 03 Jul 2004 05:58:10 GMT Subject: KT88 or KT90 for scratch built bass amp??? Sam Byrams wrote: Phooey. A tube BASS amp needs to be a general purpose power amplifier, not a guitar amplifier. Study true classics like the Altec 260B, 1570B, Mac MI200, and other audio amplifiers using real power tubes,211s, 811s,812s, and up-look at a Varian Eimac catalog. If it does not have at least 1200 vdc on the plates I am not interested at all. Play much on the road? I didn't think so. LV |
#9
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Two kinds of people will buy this amp: yuppies whose living rooms will
be its only habitat, and maybe a Stones-level touring act with traveling techs. People who get electrocuted usually get it from the 115 VAC (or 220 in Europe) line supply, not the B+. If a beer gets spilled in there the results will be the same as with any tube box, just maybe more dramatic. |
#11
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Sam Byrams wrote: Two kinds of people will buy this amp: yuppies whose living rooms will be its only habitat, and maybe a Stones-level touring act with traveling techs. People who get electrocuted usually get it from the 115 VAC (or 220 in Europe) line supply, not the B+. If a beer gets spilled in there the results will be the same as with any tube box, just maybe more dramatic. Where does the liability begin & end if you should sell one of these beasts & that is followed by an accident? Looks like a make work project for the under employed law profession, to me anyway. Good Luck, John Stewart |
#12
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Where does the liability begin & end if you should sell one of these beasts & that is followed by an accident? Looks like a make work project for the under employed law profession, to me anyway. The same liability you have with any device-microwave oven or light bulb-someone could abuse and possibly shock themselves with. Dead is dead, and if it plugs into AC distribution voltage anywhere in the world-100VAC is the lowest, in Japan-it can kill you. There's no magic number a 6550 is under and an 813 over-the 400 volt B+ will kill you, so will 1200. and the 1200 might kick you clear or burn the contacting digit off whereas the 400 just might lock you up and fry you. Might, might, might. If you are going to sell anything in the USA you could wind up in court, but you will anyway, so do it right. Dump a beer in there, there's going to be fireworks. But very few of these things are going to be gigging at Bob's Country Bunker-bass players don't need 500 watt amps anyway, they need the same amps and efficient horn loaded speakers. |
#13
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Sam Byrams wrote:
Where does the liability begin & end if you should sell one of these beasts & that is followed by an accident? Looks like a make work project for the under employed law profession, to me anyway. The same liability you have with any device-microwave oven or light bulb-someone could abuse and possibly shock themselves with. Dead is dead, and if it plugs into AC distribution voltage anywhere in the world-100VAC is the lowest, in Japan-it can kill you. There's no magic number a 6550 is under and an 813 over-the 400 volt B+ will kill you, so will 1200. and the 1200 might kick you clear or burn the contacting digit off whereas the 400 just might lock you up and fry you. Might, might, might. If you are going to sell anything in the USA you could wind up in court, but you will anyway, so do it right. Dump a beer in there, there's going to be fireworks. But very few of these things are going to be gigging at Bob's Country Bunker-bass players don't need 500 watt amps anyway, they need the same amps and efficient horn loaded speakers. Thankyou for your carefully considered response. Take it along with you when you try to buy liability insurance. JLS |
#14
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Thankyou for your carefully considered response.
Take it along with you when you try to buy liability insurance. Most boutique/High End vendors do not carry product liability insurance. They couldn't afford the premiums, and underwriters are not interested in businesses that small, and trial lawyers aren't interested in companies without either known substantial PL coverage or a very wealthy owner dumb enough to have incorporated himself in any way which could be declared a personal holding corporation. Winning a big verdict and being handed a set of factory keys is a nightmare scenario for these sharks. If they had to carry product liability insurance, most of the boutique guitar vendors and High End audio companies would fold. And it's doubtful insurance companies would be the least bit more understanding of the plethora of products with open tubes with 500 vdc plate voltages than they would be of a design with a caged, interlocked tube with two or 3 kV. One shows intent to effectively keep people away from HV and the other is an attractive nuisance-it's a wonder no small children (that we know of) haven't been barbecued by a shattered 6550 in a floor-sitting (boy is that stupid!) High End amp. |
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