• 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.

Who knows these two tube preamp boards ?

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as_audio

Member
2008-05-13 6:18 pm
Starting to clean up my mess I found two circuit boards of what seems to be tube preamps.
May be kits of some DIY project.

First one:

- 150 x 285 mm, red board of good quality
- two tubes 5814A similar to 12AU7, ECC82
- heavy regulation with semiconductors LM1086, IRF840 2x
- big Solen and Clarity caps

There is no indication of brand or manufacture.

Second one in post 2.

Thank you for help.
 

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as_audio

Member
2008-05-13 6:18 pm
Or this one ?

Now the second one:

- 136 x 151 mm board size, blue, gold plating
- two tubes 6922/ECC88
- balanced inputs, unbalanced outputs
- passive supply
- not sure two IRF9610 Mosfets are for plate supply

Some members of this forum will know more, thanks again.
 

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