|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
99.249.68.132
In Reply to: RE: Thanks for the different perspective, GSH. nt posted by drlowmu on February 24, 2015 at 10:53:29
.
Follow Ups:
Read his last three paragraphs. He too never properly bypassed Rks, but he is talking about doing that now, in the referenced post. Thanks for looking. Regards.
Jeff Medwin
.
Sure, thats fine, Rage is discussing his very recent experience - of going back to a mu of 100 12AX7 as a driver in a two stage DC amp, and liking it.
This pertains to what GSH and I were discussing, I see no problem, its on-topic.
Jeff
the 12ax7 is better than the 6ej7 pentode (triode strapped) for me right now.
I took some measurements and distortion is slightly lower with 12ax7!
hf rolloff is more but not that much. I will post measurements on the diy forum here pretty soon..
I am actually very surprised by this as I was swayed by the technically correct... and have learned a lot there... but the 12ax7 works IMO. MUCH better than expected.
You would probably need to run the pentode driver as a pentode w/feedback and measure again to see if the distortion from the driver stage can be lowered.
FWIW, the 7B4/2A3 combo at the standard 60mA operating points produced the best 1W THD% I measured when I had that circuit on a breadboard.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: