10 Vintage NOS RCA 6SL7 5691 Branded Heintz & Kaufman LOT NIB GAMMATRON

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10 Vintage NOS RCA 6SL7 5691 Branded Heintz & Kaufman LOT NIB GAMMATRON:
$500.00

Up for sale is very rare lot of 10 Vintage RCA red base *5691/6SL7* tubes NIB. Branded \"Heintz &amp; Kaufman\" made in the USA. In original boxes. As you know, all red based 6SL7\'s were only made by RCA and various companies re-branded them. (See \'stop sign\' etched logo) These were in my extra stash for an amp i no longer own.