4 Quad RCA 7581A Power Audio Vacuum Tubes - $400

4 Quad RCA 7581A Power Audio Vacuum Tubes 1

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Quad of vintage made in the USA RCA 7581A Vacuum Tubes New Old Stock, New in Box. In original RCA boxes and packaging. See photos for details, the second photo shows a 7581A being tested for transconductance and cathode current on a Hickok 539B.

The 7581A is an upgraded version of a 6L6GC, will work in any amp that uses a 6L6GC to increase the headroom of the amp. They are rated at 35 watt power dissipation instead of 30 watts for a 6L6GC.

All tested on a Hickok 539B and B&K 747B tube testers as new ratings. I have a large lot of NOS vacuum tubes send me a message if you are looking for some American made vintage vacuum tubes.

post id: 7912966576

posted: 2026-02-04 07:44

updated: 2026-03-03 07:49

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4 Quad RCA 7581A Power Audio Vacuum Tubes - electronics - by owner -...

Quad of vintage made in the USA RCA 7581A Vacuum Tubes New Old Stock, New in Box. In original RCA boxes and packaging. See photos for details, the second photo shows a 7581A being tested for...