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In Reply to: DIY phone stage recommendation for.. posted by rigma on April 24, 2007 at 14:24:07:
Another option that has intrigued me for awhile is the Thorsten E810F LCR design. A link to it is in this forum somewhere. I have not built this myself but I've thought about it a lot!I just seem to like high Gm pentodes with lots of current running through them, they can be extremely quiet and are quite linear with the right OP.
Follow Ups:
JohnSilk has LCR RIAA Phono filters.
Above is their recommended circuit.
I am intrigued by this design with 6SL7s.
I would replace the mu stages with "super mu" stages
(SRPP circuit with choke in upper resistor position).
The LL1668/5mA would be great in that position.
This gives you almost full mu gain and 600 ohm Zo.
This would be my second choice for a phono stage.DanL
Dan,What would be your first choice?
Would the phono stage be a good match for my Berman 76 line stage?
Could redraw the schematic for me with the changes you suggested?
RigmaAs I posted below the K&K Phono Kit.
http://www.kandkaudio.com/phonostage.htmlEmail me for the schematic
(Click on danlaudionut above)DanL
Hello folks
I´ve built a modified version of it with Borderpatroldesigned choke-input PSU with one psu-section per tube: 8powerx-formers,40 chokes and integrated tx103mc and 102TVC.
Sounded far better than my Io from Aestehtix
IMO
Best
Leif
Norway
I have heard the Io and even aspired to own it, but the price is outrageous.Thorsten's design has also been tempting. Guess I'll have to try it.
Thanks for the insight.
I recently changed the triode wired d3A to pentode in my phono stage and liked very much the result.
nt
I used the same anode resistor, 4k7 and added only the screen supply. The voltages came out very close to the data sheet. Changed nothing else. I didn't measure the gain but there was more. 3 clicks less on the volume control (TVC) so about 6dB more gain. Knowing the OP point, I guess you could work it out from the data sheet but I don't need to know hence I didn't bother :-)
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