Lot Of 4 6SL7GT RCA Crosley Tubes B&K Tested $20.50 USD Sold on: 2014-Apr-07 Marketplace: eBay 4 Treasure 0 Trash 100% Detail: Up for auction is a lot of 4 6SL7GT tubes. They have been tested on a newly calibrated B&K 707 for mutual conductance where 22% is minimum good. They test as follows RCA 42/45, RCA 55/50, RCA 40/4... More Relevance Historical Items
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