See my thread "new otl project"
No recent activity. ..... someone else should build one of these !!!
Nice casing. Good idea!
Nice build AJT, how did you wire the heaters?
4.2 volts paralleled...
hello ,
the final valve , is EL 36 or other ?
nice job
The final tube is PL36 ( but the amplifier can be switched to use EL36 too )
Best regards,
nice job ,
i use to EL 502 / EL 504 or EL 511 in mode " triode " , drived to ECC 81 .
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Care to share a schematic?
The shem is in my head. I made it and gave to my friend. Output stage is with mixed bias /cathod res. 100 ohm and -U 95 V on first grid, Upl-cath + 220 V, Ip - 260 ma, as I remember/. Prestage double - two triodes in ECC84. Good tube with big current and low resistance. Current of first triod 5-6 ma, in second triode - 13-14 ma. First plate res 18 kohm, second - 12 kohm, first cathode res. 500 ohm, second - 300 ohm. Grid res-s about 300-500 kohm. +U - 250-260 V. Interstage cap 330 nF. On next 2 weeks I will take decision about sound of diff. music styles and right behavior of ECC84 with 6S33S. It is my prestage schematic and it's important in the future.
First variant was with pretube 6E5P, but I didn't like it, something sharp, aggressive sound.
Boxes are my friend's work.
First variant was with pretube 6E5P, but I didn't like it, something sharp, aggressive sound.
Boxes are my friend's work.
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me too, i do not have records of completed amp schemes, what i have are bits and pieces here and there, i have several notebooks, but trying to get back at them gets me confused at times.....
when i want to build amps, i just go t the net and download schemes, but seldom do i follow the scheme to the letter....i inject my own ideas based on what power traffo and OPT's that i have...
when i want to build amps, i just go t the net and download schemes, but seldom do i follow the scheme to the letter....i inject my own ideas based on what power traffo and OPT's that i have...
KT88
first KT88 amp. driven by 6SL7, also tried the russian equivalent. to be honest; not a great difference.
first KT88 amp. driven by 6SL7, also tried the russian equivalent. to be honest; not a great difference.
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