• 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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my daily amp

Az50,2xEl84,ecc82 12112013131.jpg
 
Hi Professor, I'm curious, what are these two elements, up to the right on fourth picture, (P3C8 ? , pale green, lots of pins) something to do with the nixie dsplay - input selector?
Cheers
J.
Hi! This is relay RES8 (РЭС8) to switch the secondary windings of output transformers.
 

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Hi! This is relay RES8 (РЭС8) to switch the secondary windings of output transformers.
Thanks! Amazing, and very inspirational work, albeit such a high standard, is very hard to reach.. Tech expertise aside, the high quality serigraphies and the all-in-the-top-plate solution left me stunned, a plenty of good taste, and design wise
A true marvel
 
Hi Professor,
please tell me what kind of transformers you use and where do you got it.
I´m plannig to build a stabilized powersupply with russian parts only. I have a 6s33s, a 6sh1p and a bunch of caps and resistors all from russia.
Thanks a lot,
Hilmar
For the power supply I rewound industrial 160 w transformer OSM-0,16 (ОСМ-0,16) Output transformers made ​​a firm from St. Petersburg http://goldenmiddle.com/english/indexen.htm
P.S. Be careful with old capacitors, especially electrolytic.
Best regards, Oleg
 
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Attached is my latest amplifier - Pentode output with adjustable fixed bias. Screen is regulated via VR tubes. 5687 driver. James Output transformers and Edcor power iron.

With the fixed bias, multiple output tubes can be used - KT88, 6550, EL34, KT66, 6L6GC, etc. Also included an optional plate cap in case I ever get a pair of TT21s or 12E1s.
 

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EL34/6CA7 ultra linear single ended amp

This is a study build, I hope to move it all into a more finished case with wood and brass eventually....
This amp was designed by Professor Iwamura of Kanagawa University and featured in a design contest in MJ magazine 2012 Jan. edition.
my build blog is here if you want more detail.....
EL34 ultra linear single ended amp. Designed by Iwamura Yasuo | twiddlingmyknobs
 

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