4x 6L6GC-6N3C Bottom Inverted Cup Getter Long Grey Plate Amplitrex Tested

6N3C / 6L6GC — Matched Quad Vintage Power Tubes

 6N3C Construction
Bottom Inverted Cup Getter
 Matched Quad
Amplitrex AT1000 Verified

Up for sale is a precision-matched quad (4 pieces) of 6N3C / 6L6GC vintage beam power tubes. These units feature the reliable Bottom Inverted Cup Getter & Long Grey Plate design, known for providing stable performance and excellent longevity in high-power guitar and Hi-Fi amplifiers.

Each tube has been individually tested on the industry-standard Amplitrex AT1000 professional analyzer. This set has been curated for their tight matching in both plate current (Ip) and mutual conductance (Gm), ensuring balanced operation across all four sockets.

Serial No.	Test Triode	Parameter Ip mAdc	Result Ip mAdc	% Ip	Parameter Gm uMhos	Result Gm uMhos	% Gm
5269062	Single	72.0	64.5	89.5%	6000	5570	92.8%
5269069	Single	72.0	68.0	94.4%	6000	5550	92.5%
5269079	Single	72.0	63.6	88.3%	6000	5500	91.6%
5269093	Single	72.0	65.4	90.8%	6000	5550	92.5%

Technical Note: Percentage values are calculated against standard factory specifications for 6L6GC (72.0mA for Ip and 6000 uMhos for Gm). All tubes in this quad test with strong emission.

Note: Custom duties and taxes are the responsibility of the buyer in their country.