alexc said:Thanks for the comments regarding bias methods
My next build, a single ended parallel pair 6550 guitar amp with Edcor/Hammond iron, is going to use switched fixed/cathode biasing.
Along with triode/tetrode switching.
Then I can hear for myself
I've already finished the nice pine enclosure for it - a 15" Jensen 30W rms speaker.
It should be the least power efficient thing I ever conceived. The iron are HUGE! The output expected 15W/25W.
Kind of a Champ on dmt
I can't think of a serious tube monitor amp that did use cathode bias on the output......ruffrecords said:I am curious as to your reasons for using fixed bias on the output tubes?
Cheers
Ian
bockaudio said:I can't think of a serious tube monitor amp that did use cathode bias on the output......ruffrecords said:I am curious as to your reasons for using fixed bias on the output tubes?
Cheers
Ian
Marantz 9 (which we used at Oceanway for mids & HF) fixed bias
McIntosh 275 fixed bias
EAR 549 or 509 fixed bias
there are probably others I've never run into
My ignorance. What are the Leaks, what was their power, what were they driving and what era?ruffrecords said:bockaudio said:I can't think of a serious tube monitor amp that did use cathode bias on the output......ruffrecords said:I am curious as to your reasons for using fixed bias on the output tubes?
Cheers
Ian
Marantz 9 (which we used at Oceanway for mids & HF) fixed bias
McIntosh 275 fixed bias
EAR 549 or 509 fixed bias
there are probably others I've never run into
What about the Leaks that were used extensively at Abbey Road?
Cheers
Ian
bockaudio said:My ignorance. What are the Leaks, what was their power, what were they driving and what era?
Interesting links. I didn't see the schematics or references to self bias output stages. So, state of the art for 1946-7? (Not that there's anything wrong with that)ruffrecords said:bockaudio said:My ignorance. What are the Leaks, what was their power, what were they driving and what era?
Check out this link:
http://44bx.com/leak/PointOne2.html
and this:
http://en.wikipedia.org/wiki/LEAK
Cheers
Ian
I did this with a single EL34 & 12AT driver. Ended up with cathode bias. Did NOT like xfmrs made for SE on this, an old Chicago made for PP 6V6 did the trick & lived to tell.alexc said:Thanks for the comments regarding bias methods
My next build, a single ended parallel pair 6550 guitar amp with Edcor/Hammond iron, is going to use switched fixed/cathode biasing.
Enter your email address to join: