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In Reply to: RE: Anything like this available? posted by Opus 33 1/3 on May 26, 2014 at 02:48:42
Self (cathode) bias is quite feasible, when "12" W. tubes, like the EL84 and 6V6, are employed. A self biased design never needs adjustment. ;>)
If you can DIY, an "El Cheapo" built using Dunaclone Z565 O/P trafos and triode/UL mode switches will surely do the job. If you can't build for yourself, see about commissioning a build from Mike Samra or Don Sachs, along with other capable "inmates" from the tube DIY "board".
Need a phono section? The tweaked RCA setup WILL fill the requirement.
Eli D.
Follow Ups:
can you sub the 6bq5 for the 12aq5 without much trouble(same transformer)?
I've go iron from an old Eico EL84 integrated amp laying around here somewhere.
Yes, you can switch to the EL84/6BQ5. However, the R/C bias network needs to change. Contact Jim McShane for the proper values.
If your speakers are sensitive enough to make triode mode operation 100% of time practical, I strongly advise the use of 6V6 family O/P tubes. Not that the EL84 makes a bad triode, but the 6V6 family make superb triodes.
Eli D.
But I have quite a stash of EL-84's and never go around to collecting 6V6's back in the long-ago days when I could get most all the domestic tubes I wanted for cheap($5-$10 each).
Likely try to duplicate the Eico EL-84 PP circuit as I already have the iron. One of the sweetest sounding DIY PP amps I've heard was built using Eico iron and Loctal tubes!
Sadly never managed to get the schematic but it was build using all Eico iron and I seem to recall the guy saying it was very much a copy of the Eico PP circuit.
Have a lot of loctal tubes but no 7C5's or 7Z4's or I'd give it a try.
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