15 watt PA amp

[isaac_teller]

12a6parts.pdf
12a6schematic.pdf



Hello. I came across an interesting schematic using inexpensive tubes(which I have, along with the OT) and thought that this would be a good junkbox build.
Changes to be made:
  1)diode rectification(FWB). Don't need the doubler, just a 220:220 isolation transformer(I live in a 220-volt country).
  2)parallel filament wiring, not series.
  3)Single channel-apparently there is an error, V1 should be 12SF5 not 6SF5. I'll probably use a 12AV6.
Anything else I need to switch to make it more guitar friendly? Once I get it up and running I'll fine tune the sound.
Thank you.

[sluckey]

Your links do not work. Looks like the links are pointing to YOUR computer.

[isaac_teller]

Having trouble with the computer. I'll try again later.

[isaac_teller]

Fixed it!

[PRR]

Major changes needed. As drawn it is HOT CHASSIS which for guitar is deadly. You can't do that anyway at 220V wall outlet. But you have to compelely re-figure the heater power (or just go 12V). Without tube rectification the B+ will be far higher (~~320VDC) than the 250V rating of the power tubes.

Think this through.

[isaac_teller]

OK. As I mentioned in the original post I will be using an isolation transformer and parallel filament wiring. I suppose I'll also put a 250 ohm 10-watt resistor after the bridge.