• 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.

Photo Gallery

Repair and restoration of the old amplifier Dynaco SCA-35.
Here's what happened.
The amplifier sounds great, completely missing the background.
Power got a new life.
 

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Repair and restoration of the old amplifier Dynaco SCA-35.
Here's what happened.
The amplifier sounds great, completely missing the background.
Power got a new life.

Not too surprised, the SCA-35 was highly regarded. If fact, some Audiophiles actually thought the "35" was perhaps the the best sounding Dynaco Amplifier, at least within it's design limitations!

Best Regards,
TerryO
 
Hi to all ! this is my new tube line preamp , one ECC83 and one PCC85 in each channel , the circuit is not complicated , ECC83 LTP input stage followed by the PCC85 in SRPP configuration , I use about 20dB of negative feedback , the result is a wide and clear sounding preamp ! , -3dB @ 380KHz , Zout =700ohm .
 

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This is my last work.
This is the initial amplifier.
MM has two entrances and two universal inputs.
Exit 1B.
Power anodes - a vacuum regulator.
Retention rate + - 1%, the level of -70 dB background.
Heating tubes strengthen -germanievye semiconductors and current stabilizer.
Driving classic MM equalizer 12AX7 tube (6N2P)
Tubes linear part ECC88 (6N23P)
Tubes powerful part 5Ц4С 6Ф6С СГ3С 6Г2
Resistors: Welwin, capacitors CDE Budrok.
The high-power capacitors Tesla oil, and Black Gate Rubycon.
Overload level Linear + 20dB, the background level of -70 dB line.
The background level equalizer - 50dB.
The same wire used Siemens and the old RCA. Tranformator old Dinako.
Drossel Telefunken.
Chassis laser cutting, aluminum, argon welding.
 

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Last edited:
Very very nice ..pre amplifier, I suppose. This front plate is thick aluminium? You say you 've used germaniun semiconductors, but where? heater rectifiers? What is for this lone bronze binding post, leftside behind the RCA sockets?
Dimitris, another style, but also elegant. Superb craftmanship. Envy.

Yes, 12mm aluminum front panel.
Rectifier diode heating very old Soviet Д303 germanium.
 
Hi to all ! this is my new tube line preamp , one ECC83 and one PCC85 in each channel , the circuit is not complicated , ECC83 LTP input stage followed by the PCC85 in SRPP configuration , I use about 20dB of negative feedback , the result is a wide and clear sounding preamp ! , -3dB @ 380KHz , Zout =700ohm .

Nice done Dimitris, I'm interesting in how you connect VU meter circuit? I want to do with my VU too.