• 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.

My DIY Pre-Amplifier used 5692 and 45 Tube with output transformer

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Here is my Tube Pre-amplifier I have DIY. It used one 5692 and two 45 tube with output transformer. It is great sound.
 

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There were many USA tubes in Viet Nam from the Viet Nam-War. We have many kinds of them. This tubes used in my Pre-Amp have bought from eBay. Now I have got around 100 tubes of 5692 red base in many lables as RCA, TUNG-SOL, GE, RAYTHEON, WESTINGHOUSE... Most of them are NOS.

This Pre-Amp is very good. I will post it's schematic late.
 

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