Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
In Reply to: RE: Opinions on 6P3S for Hi-Fi ? posted by Triode_Kingdom on May 10, 2017 at 08:36:30
worth browsing through.
That's Jim Cross in Orlando, FL. He screwed me on a large purchase of defective 7-pin 1625 sockets some time back. He offered to make good on a few, then stopped communicating. Cost me almost $100, and it was nearly a total loss.
Buy Chinese. Bury freedom.
ewwww. Sorry. I was led to believe this outfit was thee major supplier for smaller vendors. Guess I better break out the tube tester. I got a batch of the 12-volt 9-pin version of 6SN7 from him, 12FQ7.
I was quite happy to see this post - I really like the 6P3S . A while ago I purchased 36 of them and proceeded to current match them on my modified ST-70 . I swopped the 5AR4 in the ST-70 for a Russian 5C4M - this reduced Anode voltage to about 415V . I then adjusted bias to minimum and set balance adj. to the center position . I then use the ST-70 as a tube tester to current match the tubes , and then sort them into matched or closely matched quads .
The spread at 415V range ( within my 36 valves ) from 30 to 50 mA . One tube ran over 70 mA and two in the mid to high 50's . I gave the highest current quad to fellow South African valve aficionado , warning him that this was the hottest running quad and should be used at low anode voltages .
The hotter running remaining tubes ( 40-50 mA ) I run in Quad 2 monoblocks with the same 5C4M rectifier ( 5C3S also works ) , with bias resistors values increased from 180e to 250e ( 4x 1K 1 watt resistors in parallel ) .
The cooler running quads ( 30-40 mA ) I use in the Dynaco and bias to ~85% dissipation ( ~17W per tube ) using Rob Robinette's online bias calculator to find desirable bias setting .
Compared to a Quad of vintage CV1947's , and 3 sets of EL34's ( Mullard , JJ EL34L's and EH's ) they sound pretty good ; in the Quad 2's or ST-70 . I love 'em . :)
For the money , I reckon you can't go wrong .
" When in doubt, do the courageous thing. " - Jan Smuts
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: