In Reply to: RE: New Tubes (6CA7)--now bias too high posted by petercapo on February 10, 2016 at 17:19:10:
Thanks again, Peter. I cleaned and re-tensioned #5 to no avail. In doing a little research, it appears that a subset of the current production EH tubes that pass factory spec draw a high amount of plate current and cannot be biased in most EL34 amps. Tubestore.com apparently culls these and sells them at a discount. (see here: http://www.thetubestore.com/Tubes/EL34-6CA7-Tube-Types/Electro-Harmonix-EH6CA7-HPC ) The only thing I can think of is that I have a set that draws high current. If this is the case and, if I get stuck with the set, would it be possible to decrease the current by adding resistance on the B+ side?
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: New Tubes (6CA7)--now bias too high - daveap 13:19:56 02/11/16 (5)
- RE: New Tubes (6CA7)--now bias too high - petercapo 14:15:10 02/11/16 (4)
- RE: New Tubes (6CA7)--now bias too high - xaudiomanx 17:49:02 02/15/16 (3)
- RE: New Tubes (6CA7)--now bias too high - daveap 15:04:04 02/16/16 (2)
- RE: New Tubes (6CA7)--now bias too high - xaudiomanx 17:32:24 02/16/16 (1)
- RE: New Tubes (6CA7)--now bias too high - jsblock 04:56:04 05/05/16 (0)