@Nigel i was hopping it will be useful both for listening to music decent enough and as a small guitar amp... (i don't mind the output power at all...)
A guitar amp, and an amp for listening to music are completely different things, people like to use valve amps for guitar for the poor quality, it's what they want.
If I get time tonight I'll have a look for an old book I have, which show how to build decent quality valve amps - but they aren't really suitable for guitar.
Why not just build a better quality transistor or IC amp?.
If I get time tonight I'll have a look for an old book I have, which show how to build decent quality valve amps - but they aren't really suitable for guitar.
Why not just build a better quality transistor or IC amp?.
nigel i have many chip amps, a tube amp is something different and more interesting if i manage to finish it.
well... i don't know... if you want check your books... thanks!
i was equaly interested using it for guitar and for listening music...but
i understand it's not possible.
nigel i have many chip amps, a tube amp is something different and more interesting if i manage to finish it.
well... i don't know... if you want check your books... thanks!
i was equaly interested using it for guitar and for listening music...but
i understand it's not possible.
The tubes amplifier schematics posted by Nigel have negative feedeback for improved sound. Then the transfoemer must be very high quality and have a low phase shift.
I have never made an audio output transformer for an old tubes amplifier so I don't know what the manufacturer does to make it wide-band with a low phase shift.
i'm going to do full wave rectification with 1N4007 a couple of
capacitors 150uF/400V and 220nF/400V maybe an inductor and i think i need a load resistor because the transformer outputs 220VAC...
about the heater the transformer outputs 6.3V/3A and i think i'll leave it as is and if the hum is high we will see...
what about the input? i thought every cable inside there can catch noise...
when i'm saying "load" i mean a resistor in parallel after the rectification to dissipate some power...
the power supply is 220VAC/250mA
probably you mean that i must always have my speakers connected right?! if yes what's going to happen if i forget it? can i blow off the tubes or only the output transformers?
The Tube Power Amplifier EL84 was used in cheap AM radios in 1952. When I was a kid I remember the radio that was nice and warm but it sounded like hell.
probably you mean that i must always have my speakers connected right?! if yes what's going to happen if i forget it? can i blow off the tubes or only the output transformers?