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#1
Posted to rec.audio.tubes
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12 vdc tubes
Hi all
I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC |
#2
Posted to rec.audio.tubes
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12 vdc tubes
RealInfo wrote: Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC Have you tried a Google search for low voltage vacuum tubes? RCA and others produced a full range of them for car radios. Patrick Turner. |
#3
Posted to rec.audio.tubes
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12 vdc tubes
"flipper" wrote in message ... On Mon, 29 Dec 2008 10:44:56 +0200, "RealInfo" wrote: Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC http://www.duntemann.com/12vtubes/12vtubesindex.htm 12V is a lay, 'slang' term. It's actually nearer 14.3V DC. Jim |
#4
Posted to rec.audio.tubes
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12 vdc tubes
"flipper" wrote in message ... On Tue, 30 Dec 2008 18:36:01 -0000, "Jim Gregory" wrote: "flipper" wrote in message . .. On Mon, 29 Dec 2008 10:44:56 +0200, "RealInfo" wrote: Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC http://www.duntemann.com/12vtubes/12vtubesindex.htm 12V is a lay, 'slang' term. It's actually nearer 14.3V DC. Jim Good luck on finding a 'non lay', 'non slang' datasheet that calls a 6 cell lead acid battery anything other than a 12V battery. 12V is nominal voltage and dern close to actual at 50% capacity. At full charge a "12V" lead acid will be around 12.7V and 10.5V when discharged. 14.3V would be charging voltage. In engineering some amount of jabberwocky is necessary but engineers don't like excesses any more than 'lay' people do and it's a heck of a lot more convenient to say "12V battery" since, as the saying goes, "everybody knows what that means," than it is to say "12.7V to 10.5V, depending on when you look at it and don't forget what happens during charge, battery." I stand corrected, but I had meant to say nearer 13V3 DC for a fully-charged but off-load, Wet battery. Do Gel batteries, such as fitted to invalids' cars and golf carts, also show a similar ready, off-load voltage? Jim |
#5
Posted to rec.audio.tubes
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12 vdc tubes
On Dec 30, 2:07 pm, flipper wrote:
On Tue, 30 Dec 2008 18:36:01 -0000, "Jim Gregory" wrote: "flipper" wrote in message .. . On Mon, 29 Dec 2008 10:44:56 +0200, "RealInfo" wrote: Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC http://www.duntemann.com/12vtubes/12vtubesindex.htm 12V is a lay, 'slang' term. It's actually nearer 14.3V DC. Jim Good luck on finding a 'non lay', 'non slang' datasheet that calls a 6 cell lead acid battery anything other than a 12V battery. 12V is nominal voltage and dern close to actual at 50% capacity. At full charge a "12V" lead acid will be around 12.7V and 10.5V when discharged. 14.3V would be charging voltage. The aircraft industry calls the 6 cell lead acid battery electrical system, with an autoderivative (i.e., automotive with a FAA-PMA tag: the alternator is $50 and the tag $450) alternator and a lead acid battery that differs from lawn tractor only in having check ball caps, "14V". The alternative is the 28V system which may use a 12 cell lead acid battery or a nicad with somewhat more cells. The aircraft 14 and 28 volt systems have precisely the same usable ranges as the automotive 12V and 24V (military vehicles and some older trucks and buses have 24V) systems. Bogey voltages for tubes are 6.3 and 12.6 volts which was said to be a good midpoint in those days. 6 volt systems (never used in aircraft AFAIK) are often converted to 8 volt with a four cell battery. The six volt light bulbs glow brightly, live not so long, but most old cars don't drive that much anyway. If you have a 6 volt radio in the car what's the fix? A dropping resistor I guess. |
#7
Posted to rec.audio.tubes
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12 vdc tubes
flipper wrote:
On Wed, 31 Dec 2008 17:03:26 -0800, PhattyMo wrote: It's sorta like the "120Vac" or "240Vac" nomenclature. 120V may be anywhere from like 115-130Vac.. "240" might actually be 220V,230V,240V,etc.. I'm not sure what kind of "sorta like" you mean. "Sorta like" my wall outlet measures 127.0Vac right now,according to my DMM. Isn't the standard in the USA 120Vac,or 125Vac? The 'standard' so called '12Volt' battery varies also,as you've pointed out. It's 'sorta like' in that there's a voltage tolerance and the battery ranges from 10.5V to 12.7V depending on it's charge. But if you mean how line voltage used to be 110VAC nominal, then 115VAC nominal, then 117VAC nominal, then 120VAC nominal then it isn't because a 6 cell battery is a 6 cell battery and the voltage per cell hasn't changed. flipper wrote: On Tue, 30 Dec 2008 21:34:51 -0800 (PST), wrote: On Dec 30, 2:07 pm, flipper wrote: On Tue, 30 Dec 2008 18:36:01 -0000, "Jim Gregory" wrote: "flipper" wrote in message ... On Mon, 29 Dec 2008 10:44:56 +0200, "RealInfo" wrote: Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC http://www.duntemann.com/12vtubes/12vtubesindex.htm 12V is a lay, 'slang' term. It's actually nearer 14.3V DC. Jim Good luck on finding a 'non lay', 'non slang' datasheet that calls a 6 cell lead acid battery anything other than a 12V battery. 12V is nominal voltage and dern close to actual at 50% capacity. At full charge a "12V" lead acid will be around 12.7V and 10.5V when discharged. 14.3V would be charging voltage. The aircraft industry calls the 6 cell lead acid battery electrical system, with an autoderivative (i.e., automotive with a FAA-PMA tag: the alternator is $50 and the tag $450) alternator and a lead acid battery that differs from lawn tractor only in having check ball caps, "14V". If you say so, but all the ones I can find say "12V." Like this line http://www.advancedpowerproducts.com/main_batteries.php Application guide http://www.advancedpowerproducts.com/aag1.php I didn't check each and every make but all the ones I did check were either 12V or 24V The alternative is the 28V system which may use a 12 cell lead acid battery or a nicad with somewhat more cells. The aircraft 14 and 28 volt systems have precisely the same usable ranges as the automotive 12V and 24V (military vehicles and some older trucks and buses have 24V) systems. Bogey voltages for tubes are 6.3 and 12.6 volts which was said to be a good midpoint in those days. 6 volt systems (never used in aircraft AFAIK) are often converted to 8 volt with a four cell battery. The six volt light bulbs glow brightly, live not so long, but most old cars don't drive that much anyway. If you have a 6 volt radio in the car what's the fix? A dropping resistor I guess. |
#8
Posted to rec.audio.tubes
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12 vdc tubes
Check out the Millet Headphone Amp. It uses a choice of 3 different tubes
designed for car radios so should be just what you need. . The tubes are 12FK6, 12AE6, 12FM6. I use one and love the sound. The tubes are reasonably cheap, also. "RealInfo" wrote in message ... Hi all I am looking for old tubes operating on very low voltage , battery voltage . I need them for portabe batery oerated tube preamps . Any sugestions ? Thanks EC |
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