• 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

6н1п+6п14п SE без оос
 

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This is only bamboo tray that I bough from market, and I used for my experiments
Today I put on this tray Russian 30П1С with the same pretube 6Н8С and the sames big OTs....After listening I thing hard, IMO, this is the best Russian tethrod from all Russian tetrods and penthods, that I tried. I thing the best are EL11 Telefunken, 30П1С /30P1S/, 4П1Л /4P1L/ and ......
IMO, I think, the best LF sounding have output triodes, like 2A3, 45, 6BL7, 300BJJ, Sovtec /I put 6BL7 before 300B/, maybe 6S4S and Amer. variant....These tubes sound deepest....
TV tubes are more for MF and HF. Tubes, that I tried, E236L, E130L, 6P36S, 6P45S, 2E26, PL...decrease LF from 40-30 Hz.
I didn't tried big quantity of tubes, but every time, when I try different output tubes, result, IMO, is like above. Sorry, Your opinions maybe are different....
 
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3D21b AB2 amp

3D21B AMP;
Does Anyone have the data for the 3D21B; I can find 3D21, 3D21A, 3D21WA,3D21WB, but not 3D21B.
The 3D21 has 15 watt plates the 3D21WA, 3D21WB have 40 watt plates, I have no idea what the 3D21B has
Phil
 

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New stuff

This one looks really nice, especially if you like vintage amps like I do. It looks old but it's just an illusion. I should take better pics for this one and maybe open a thread to explain what it is all about. Maybe someday.
 

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Oh I forgot...

I built this phono pre for a friend, nothing fancy, just a quickie. Anyway, he's pretty happy with it and listens to records everyday. He's weird this friend of mine, only plays singles. No LP's no CD's ....huh? Pre sounds pretty good. 6DJ8's....designed by.....oh I forgot his name.
 

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Bottlehead Mainline Headphone Amplifier

Neat balanced headphone amplifier from Bottlehead. Uses 12AU7 for power and two 6C45-Pi. This build features a powdercoated antique copper top plate, copper-leaf wood base, big 10uF Jupiter capacitors, and classy Cardas copper wire.

Enjoy the pics! Build log with lots more photos and details here.

Bottlehead-Mainline-Interior-2.jpg


Bottlehead-Mainline-Interior.jpg


Bottlehead-Mainline-Finished.jpg