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