Hey Tony....I've been looking for P-P Amp Challenge for the 6LU8's that I have laying around after building this SEUL Amp...Any chance that you could share a Schematic, without the Buffer?
An externally hosted image should be here but it was not working when we last tested it.
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6LU8 build #3....based on a mullard 5-20, 6j9 input triode wired,
the triode side of the 6lu8 wired as ltp phase splitter....
so far the earlier two previous builds have been concertinas...
0A2 used as voltage reference for the mosfet source followers
feeding the screen grids of the output finals...
output traffos...
partial underside:
the triode side of the 6lu8 wired as ltp phase splitter....
so far the earlier two previous builds have been concertinas...
0A2 used as voltage reference for the mosfet source followers
feeding the screen grids of the output finals...
An externally hosted image should be here but it was not working when we last tested it.
output traffos...
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
partial underside:
An externally hosted image should be here but it was not working when we last tested it.
you mean this?
An externally hosted image should be here but it was not working when we last tested it.
Tony:
No it was this link, http://www.veiset.net/6LU8/index.html, that is not working. You referenced this link for you 6LU8 schematics.
No it was this link, http://www.veiset.net/6LU8/index.html, that is not working. You referenced this link for you 6LU8 schematics.
the subscription for the website must have run out....
found these links for a japanese site and works, use a translator but the schematics given are okey....
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build #3
it works, now tweaking G2 and adjusting of G1 bias to get each tube to dissipate about 9 watts each...
plate voltage is around 350 volts and cathode currents at around 30mA each...
this tube can take 400 volts on the plate and about 260mA of cathode current so this tube is not stressed too much...
the triode portion which is a 12at7 has cathode current of 106mA
the 6Lu8 is a mighty fine tube...
6J9 input pentode wired as triode,
G2 is regulated as well a G1 bias zener regulated...
what can i say? i like it that way...
amp was dead quiet, no hum, no hiss......
all irons used are designed and built by me...
plate choke, g2 supply chokes in a full wave voltage doubler psu configuration...
generous filtering, 1000ufd/450 volts per channel....
and the ltp and input circuits do not share a common psu...
it works, now tweaking G2 and adjusting of G1 bias to get each tube to dissipate about 9 watts each...
plate voltage is around 350 volts and cathode currents at around 30mA each...
this tube can take 400 volts on the plate and about 260mA of cathode current so this tube is not stressed too much...
the triode portion which is a 12at7 has cathode current of 106mA
the 6Lu8 is a mighty fine tube...
6J9 input pentode wired as triode,
G2 is regulated as well a G1 bias zener regulated...
what can i say? i like it that way...
amp was dead quiet, no hum, no hiss......
all irons used are designed and built by me...
plate choke, g2 supply chokes in a full wave voltage doubler psu configuration...
generous filtering, 1000ufd/450 volts per channel....
and the ltp and input circuits do not share a common psu...
Attachments
Jan Veiset's 6LU8 P-P schematic and relevant site info can be found here:
Vertical deflection tubes for audio output?
Vertical deflection tubes for audio output?
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