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Old 13th July 2012, 01:11 PM   #1
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Default First attempt at tube amp.

Afternoon all, well as stated in my intro thread I want to try to build a Valve Guitar Amp. I have been looking around on the net and have decided that I would either like to base my amp on the VOX AC30 or the Peavey Classic 30. I have seen pleanty of versions of the electrical schematics for both amps, which it has to be said look very complicated. I have started trying to get a base idea of what valves I will need to be using. After looking at these schematics I will be using a GZ34 Rectivier, a bunch of 12AX7's and a bunch of EL84's.

My first question would be how do I work out what input transformer I should be using, I have seen a schematic for the AC30 saying that it should be a 300-0-300, 5 and 6.3 and I have seen aonther one saying a 180-0-180,5 and 6.3. What determines the voltages that I need? Being that these input trafos are hard to find, I want to try to get it right first time.

Thanks for your responses in advance.

G.
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Old 13th July 2012, 01:39 PM   #2
DF96 is offline DF96  England
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There is a separate forum for instruments and amps. You may get better answers there.

What you call the input transformer is actually the mains (UK) or power (US) transformer. An input transformer is something rather different.
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Old 13th July 2012, 11:21 PM   #3
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The difference in the transformer voltage is likely that the 300 0 300 uses a tube rectifier and the the 180 0 180 uses solid state to achieve approx. the same voltage output.
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Old 13th July 2012, 11:25 PM   #4
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This might be a place to look?

Kits - Guitar Tube Amp
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