|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
71.0.209.78
In Reply to: RE: Wrong link. nt posted by kyle on February 24, 2015 at 10:56:48
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
Follow Ups:
.
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: