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(!!!!) (Best 5687WB Pair) JAN-5687WB Sylvania and Philips by Sylvania black plates NOS 1980-1983 (41.5/40.5ma and 40/43.8ma) 1-3% matched
(!!!!) (Best 5687WB Pair) JAN-5687WB Sylvania and Philips by Sylvania black plates NOS 1980-1983 (41.5/40.5ma and 40/43.8ma) 1-3% matched
$ 139.99
1 low noise pair) JAN-5687WB Sylvania and Philips by Sylvania black plates NOS 1980-1983 - same build
1 tube) 41.5/40.5ma Gm=13,300/13,400 (Sylvania)
1 tube) 40.0/43.8ma Gm=13,100/13,400 (Philips by Sylvania)
Good Ma range 30-40ma
Good Gm range 10,000 - 12,000
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