• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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These are the front panels of marble for amplifiers made
 

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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.
 
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:D 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.....:D

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.
 

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