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Old 5th June 2004, 05:59 PM   #11
Jax is offline Jax  Sweden
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That transformer will do here, 6.3V 3.5A is just what you need. The high voltage is also enough as is the current.

You should use 6L6GC, the latest and strongest in the series.

From what I could see in the schematics, the most difficult component is the voltage controlled resistor used in the vibrato. Not sure how to solve that. The rest should be a piece of cake save the reverb maybe.
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Old 5th June 2004, 10:56 PM   #12
SHiFTY is offline SHiFTY  New Zealand
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I have built several guitar amps for people, mainly small 5W ones (Fender Champs etc)

I would suggest asking what they want in an amp. For instance if they don't want reverb or tremolo delete those bits of the circuit.

Also I would recommend using a scematic with only 2 output tubes for simplicity, it will keep the costs down and will be much easier to get transformers. 30W from a pair of 6L6GCs is damn loud!

Try to get an old PA amp, something with a couple of 6L6GCs or EL34s will give you all the transformers you need. Also valves and sockets can be re-used.

And see if you can find a big old speaker around somewhere. I have an old Goodmans 12" for my next guitar amp (when I get the time!)
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