|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
12.10.199.10
In Reply to: RE: Bang for the Buck posted by Triode_Kingdom on July 10, 2016 at 14:27:22
In production certainly qualifies as readily available. The 2 or so WPC SE, triode wired, 6V6s yield is plenty, for headphones. Only #45 DHTs sound better, in this power range. The "reissue" TungSol 6V6 made by New Sensor is excellent. "Poindexter" is on record as preferring the variant over NOS.
Keeping with the in production theme, use New Sensor's, EH labeled, 12AY7 for the voltage amplifiers.
A total of 3 signal bottles and loop NFB is not needed, with good O/P "iron". You decide whether to cap. or DC couple the 'Y7 sections to the "finals". I'd use high PIV Schottky diodes for B+ rectification, but I appreciate your "hollow state" preference. So, buy 3 specimens of the 100 mA. rated 7Z4 and present your friend with a lifetime rectifier supply. RES shows a $3.00 price per 7Z4. :>D
Eli D.
Follow Ups:
" Only #45 DHTs sound better, in this power range."
This is an exercise to produce the absolute best sound at these reduced power levels. In that regard, the cost savings of using a 6V6 in triode VS a geniune DHT wouldn't be advantageous. If it's indisputably better, the 45 would be the one I'd use. I have virtually no experience with "flea-power" amplifiers, so I have to ask - is there a general consensus that the 45 is as good as it gets? Are there other tubes with good general availability that are as good or better?
Incidentally, I'm not sure "in production" is required, as long as the tubes are readily available. I see plenty of 45s and other "obsolete" tubes on eBay, so I think it's OK to include those in the mix.
It also occurs to me that I might have created an unnecessary limitation when I said that the cost of higher power gear could be avoided for this demonstration. Does a 211 or 845 wiggling around at 1/2W output sound better than a 45 working at a higher percentage of its capabilities? Do you think that the best low-power amp might in fact be a humongous DHT operating in the region below one watt? Maintaining a good S/N might be challenging, but again, a fairly exotic power supply is not out of the question.
--------------------------
Buy Chinese. Bury freedom.
T.K.
Yes this is an option also.. I also built a low power 845 SET stereo amp.... She's a 3 stage, 6SN7 DC 2A3 IT 845 E-P PSSS OPT's, puts out about 4.5 watts/per. Separate Input and output P.S. CLCLC filters in stereo.
How does it sound compared to my All DHT DC 45 stereo amp ?
Well I really like both amps ... the all DHT because of its ability to deliver subtle points in the music...... the L.P. 845 for the depth of the music it can deliver an still give that 45 like clarity .
So that's about an honest personal opinion as I can give.
Have fun !
Willie
.....a DHT does it better than any other tube !
Have fun!
Willie
Maybe so, but a triode wired 6V6 is nipping at a #45's heels. ;> ) Another good sounding multi-grid tube, when triode wired, is the Russian 6П15П (6p15p), preferably with the EB (ev) suffix. Notice the "12" W. theme. The tubes that were marketed as Svetlana (S logo) SV83 are 6П15П.
Eli D.
The #45's reputation is sterling. Full power distortion, without NFB, may be higher than you'd like. I don't think you will get anywhere near full power, in a headphone application.
Triode wired 6V6 family tubes are damned good sounding and much easier to drive than the #45. That simplification in the small signal circuitry could easily make the net result favor the 6V6. You can't go wrong using either type.
FWIW, residual hum level is IMPORTANT, in driving "cans". Employing all indirectly heated types could be the best way to go. In a headphone amp, I'd like to see current regulated DC heating of #45 filaments. Take no hum prisoners.
Eli D.
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: