4 Tubes - $20 (santa rosa)

condition: excellent

make / manufacturer: GE

model name / number: 12au7

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I have 4 vacuum tubes for sale:

a 12ax7a by Tube Amp Doctor, made in Germany. No issues.

A 12ax7b tube, made in China, unbranded, no issues.

An el84 tube, made in China, also unbranded not matched with the 12ax7. No issues.

A GE 12au7 preamp tube, made in USA for Hewlett-Packard in the 60s. It has an industrial cathode. Tested NOS by the previous owner and I have not used it. The testing values are on a sticker on the tube.

All of these tubes have light or no use since new.

post id: 7964459988

posted: 2026-09-10 21:57

updated: 2026-09-18 11:34

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4 Tubes - musical instruments - by owner - sale - craigslist

I have 4 vacuum tubes for sale: a 12ax7a by Tube Amp Doctor, made in Germany. No issues. A 12ax7b tube, made in China, unbranded, no issues. An el84 tube, made in China, also unbranded not matched...