Up for sale, a set of 4 used RCA - Tung Sol 6B4G tubes, 8 pin, made in USA. Identical construction - they appear to be RCA tubes re-labelled TungSol - even the date codes are the same. ST bottles, black plates. One has a cracked base but this has no effect on tests or performance in circuit. The best 6B4G tubes I have ever tested.
I used these briefly in an SET amplifier I no longer have. Tested good on my calibrated Hickok 539C tester. Tube 1: measures 3200 / 22 mA. code 939 (322) H9M Tube 2: measures 3250 / 25.6 mA. code 939 H9M Tube 3: measures 3900 / 27.6 mA code 939 H9M Tube 4: measures 3000 / 25.6 mA. RCA code 939 H8M (1900 minimum.) Will be well-packed in box and shipped within the US free of charge by US Postal. Thanks for looking,
Peter
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