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In Reply to: RE: Question posted by drlowmu on May 15, 2012 at 06:34:30
DLM,
I was thinking same thing about the 76 driver.
I tried a 6P5G (octal 76) with C4S on my old Paramour amps (SE cap coupled 2A3) and it was very sluggish compared to 12AT7.
I eventually went to a C4S'ed 6J5GT and that worked out just fine.
Of course, everyone must do what they feel is best for themselves.
dt 667
Follow Ups:
whats the bet the anon troll has a system full of high dcr sloppy amps and no money to upgrade them. So he would rather live in de nile
any way latterly I have been contemplating that the ax7 and el84 are the finest audio tubes ever built and given you where a great amp builder you shouldn't really need anything more.One day when I am bored of dht's I am going to build another el84 SE amp with the best power supply I can afford. It will have feedback and maybe even global feedback around the trans and it may even have 2 coupling caps and 2 ax7 driver stages. I once found a vintage jap rapar el84 amp for a friend. It had feedback 2 ax7 gain stages with tone controls. And we hooked that amp up and wow. 12ax7 el84 the ultimate desert island tubes and budget tubes too.
Those guys that made those tubes made them for audio with feedback and when used right they sure do sing.
I agree that the EL84 can be a great sounding valve. I don't agree that Global feed back is necessary to run them as Pentodes with pleasing results.
I have been implementing feedback between the OPT Secondary and the Cathode with very good results. I love the sound of a well tamed Pentode. I would not do this with a Triode mainly because it's not necessary secondly a 60 V bias voltage across the Secondary of your OPT is not especially safe...The Bias voltage of an EL84 and EL34 is relatively low...A cathode winding in the primary would be nice...I've not thrown the cash at one of these animals to date.
Stuben
I think Jeffrey is the real troll here. The OP asked about chokes in series and rather than his expected LOW-FI drivel, he pops up off topic to address something completely unrelated.
Meanwhile only a few threads below, Where a quote by Ray himself states he uses black wire, Jeff remains hiding under the bridge even though only a few months ago he insisted things like:
Please remind Dennis on his next order that even Ray Kimber ceased using black colors in his products, and that Ray bought equipment to measure this.
So Mikey, consider offering double TCSS lead outs, its nicer and much easier when done at the time-of-manufacture !! Oh, and go to Clear or White in place of Black, even Ray Kimber did!
The only thing worse than a troll is a troll who beats his chest while armed with dubious facts.
Synonyms for dubious:
doubtful - uncertain - questionable - shady - equivocal
Ray states the wire insulation color is an element that does not contribute to performance and adds no appreciable improvement.
It's more than dubious that Ray ever bought a $100,000 piece of test equipment and proved that black wire insulation is bad.
Those facts aren't dubious, they're just false.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Hey, you best re-read my original post in this thread. I clearly state it is off topic. If that is "trolling" so be it. I was trying to help the builder, by addressing the bigger design perspective.Is that too difficult for anyone to envision and see????
Also, any mention of "black insulation, and 12AX7s", was introduced to this thread by Paully himself, not me! Any previous posts I did on black insulation was the result of information posted by Unclestu, and I tend to still believe him fully on this subject. What you, or others want to do about black insulated wire is totally up to YOU.
My point is, IMHO, a single Type 76 is too low a gain ( mu of 13.5 as I recall) to drive the DHT finals optimally.
So far, only Deathtube 667 has contributed anything on the question of gain, where he states he found a 12AT7 was an improvement in musical presentation over a lower mu tube.
So... when do we stop this silly BS of YOU (and Paully) pointing fingers and making off-topic accusations, and return to the design idea that the gain with a single Type 76 front end might be too low for a two stage amp??
Jeff Medwin
Edits: 05/16/12
You're too much, Jeff! You hijack this thread to suit your own agenda and then have the gall to say: "So... when do we stop this silly BS of YOU (and Paully) pointing fingers and making off-topic accusations, and return to the design idea that the gain with a single Type 76 front end might be too low for a two stage amp??"
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