Tubes Asylum

RE: Does a tube that looks and tests NOS but comes from unused gear qualify as NOS?

24.205.133.184

In Reply to: RE: Does a tube that looks and tests NOS but comes from unused gear qualify as NOS? posted by Michael Samra on November 04, 2009 at 09:31:43

Yeah, many NOS tubes are pulled from unused equipment & test well. One thing I've noticed with 6DJ8-type pulled from unused scope, is they maybe noisy. As audio noise may not be important for their function in other equipment. So it's good to have the tube tested for noise as well as strength.

The Sylvania 5932 is a good tube. I find they sound the best if you bias them like 6L6GB or 5881. Keep the anode plate voltage around 350-360 VDC and plate watt dissipation, at idle, of around 15-18 watts per tube. Fine tune to tone.

Same with the 5992. Don't put them in amps that run +400 VDC on the plates. Keep the idle bias below 10 watts dissipation. They do not like the settings of early Fender amps which really pushed the 6V6GT's.

Good luck with those tubes!

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