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#1
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Salvaging a 6v6 PP OPT for SE use
Folks --
I bought a chassis that used to be a stereo, and I want to turn it into a guitar amp. One big ol' PT using a 6X4 rectifier, driving two channels that each used a 12AX7 and two 6V6s. I want to make a semi-low-power amp, like a Champ, but the two OPTs are push-pull. My question: Can I just use one of the trannys SE, by just capping off the center tap? Or will it smoke the transformer? If I'm only running one 6V6 and a 12AX7 or two, that shouldn't kill it, right? If not, can somebody recommend a PP amp using four 6V6s and two 12AX7s? If I can't turn this thing into a low-watt growler, I'll at least turn it into a beast. And, while I'm at it, how can I make the calculations so I can figure out all this stuff on my own? |
#2
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Try http://www.duncanamps.com/, http://www.aikenamps.com/, and
http://www.dogstar.dantimax.dk/tubestuf/ These sites are full of excellent info on amp designs and the equations you need to make reasonable decisions on modifying or building amp circuitry. JamesG "Chris Grier" wrote in message om... Folks -- I bought a chassis that used to be a stereo, and I want to turn it into a guitar amp. One big ol' PT using a 6X4 rectifier, driving two channels that each used a 12AX7 and two 6V6s. I want to make a semi-low-power amp, like a Champ, but the two OPTs are push-pull. My question: Can I just use one of the trannys SE, by just capping off the center tap? Or will it smoke the transformer? If I'm only running one 6V6 and a 12AX7 or two, that shouldn't kill it, right? If not, can somebody recommend a PP amp using four 6V6s and two 12AX7s? If I can't turn this thing into a low-watt growler, I'll at least turn it into a beast. And, while I'm at it, how can I make the calculations so I can figure out all this stuff on my own? |
#3
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Hey Chris, you mention caculating, butt.. you need a starting point.
Don't start clipping wires untill you've measured plate volts on those 6V6's. That'll give you somewhere to go from. If the plates, at pin 3 counted clockwise from the pin, measure around 300-350 or less, you can probably build a SE Champ, but I'd reccomend the Deluxe 5E3 circuit, using that PT. Two 6V6's and about 18 Watts, self-biased. Either way, leave the center tap alone or you'll be putting double the volts to that poor litle 6V6. Get the schemos from schematicheaven.com. You could possibly go to the Twin Reverb circuit with what you're starting with. Porky never re-invented a wheel, butt.. never above re-arranging the spokes a bit. |
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