Sylvania & Zenith 6F6G Vintage Vacuum Tubes Amplitrex Tested 86% & 87% Gm
USD 40.00 USD
Two 6F6G vacuum tubes testing strong at 86% and 87% Gm. 100% represents what you would expect from a NOS tube on our Amplitrex and 65% is considered too low to use.
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