If it will measure the 12 H at a DC bias of 40 to 50 mA. That’s the unknown. Cheap enough to give it a try.
My initial take on using that 12H transformer:
For an output tube in pentode / beam power mode, 12H primary, and a Lead Guitar (lead guitars lowest frequency is 80Hz), it should be OK.
It will probably saturate if the tube is at 40mA or 50mA.
But, at a plate current of 32mA you will get 2.5 Watts, and probably no saturation.
If I remember correctly, that is more power than what the original poster requested.
For a 6CK4 triode, 12H primary, and a Bass Guitar (lowest frequency 40Hz) it should be OK.
Run it at 32mA and get 2.5 watts, might saturate on 40Hz, especially at 40mA or 50mA plate current.
What kind of music will be played on the guitar?
Smooth Jazz?
Hard Rock?
Lead?
Bass?
Build something! It sounds better than nothing.
No one amplifier fits all.
For an output tube in pentode / beam power mode, 12H primary, and a Lead Guitar (lead guitars lowest frequency is 80Hz), it should be OK.
It will probably saturate if the tube is at 40mA or 50mA.
But, at a plate current of 32mA you will get 2.5 Watts, and probably no saturation.
If I remember correctly, that is more power than what the original poster requested.
For a 6CK4 triode, 12H primary, and a Bass Guitar (lowest frequency 40Hz) it should be OK.
Run it at 32mA and get 2.5 watts, might saturate on 40Hz, especially at 40mA or 50mA plate current.
What kind of music will be played on the guitar?
Smooth Jazz?
Hard Rock?
Lead?
Bass?
Build something! It sounds better than nothing.
No one amplifier fits all.
Thanks for your detailed answer.
I play mostly rock. So, I like overdriven/distorted tone.
Cheers,
Pedro
So a 5 watt transformer might work well at 2 and a half watts, and if that fits the bill fine. Is it still a good deal for a 2.5 watt transformer? Maybe. But if I was looking to buy that I might be trying to make the full advertised 5 watts (At 70 or 80 Hz). It is only a $30 experiment, though, and I’ve certainly spent more at risk trying things out.
OP was looking to make half a watt with the transformer he already had, which it would. The proposed operating point was a bit too high, and could have been cut down to save heat in the small signal tube chosen to drive it.
OP was looking to make half a watt with the transformer he already had, which it would. The proposed operating point was a bit too high, and could have been cut down to save heat in the small signal tube chosen to drive it.
What about this one? It’s a bit more expensive but maybe better too.
And it has secondary taps for 4, 8 and 16 ohm, which allow me to get other primary impedances if necessary.
https://primarywindings.com/product/amp-maker-5w-single-ended-output-transformer/