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In Reply to: RE: tube preamp for Hafler amp posted by rockanroller on January 31, 2016 at 18:08:01
Can you DIY? If so, there are big $ to be saved.
I've uploaded a "deluxe" hybrid line stage schematic that can drive a hideously difficult load. Your DH500 will be "a walk in the park".
BTW, the 6SN7 is a prime candidate for the most linear voltage amplifying device ever accolade. ;>)
Eli D.
Follow Ups:
Eli,
Sorry for having to ask: Is anything like an amplified voltage signal taken from the plate of the first triode except through the second triode's plate resistor or is there something going across via the cathodes? I guess I'm not seeing this circuit well.
Thanks,
Jeff
No signal is taken off the inverting triode's plate. The twin triode is a differential gain block, AKA LTP, that's driven only at the inverting triode's grid. The 2 triodes are coupled, at their cathodes. The presence of a CCS in the "tail" forces symmetry between the 2 sides.
Eli D.
Eli, what is the rationale for using "cathode coupled" triodes in the uploaded schematic?
The circuit is non-inverting. :> D
Being limited to a theoretical max. of 1/2 mu for gain is good, too. "Hair trigger" volume controls suck .
Eli D.
I didn't see this..This would be perfect and he can use the tweaked RCA phono with it.
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
Hello.
If I understand your answer, you sent me the schematics to build a tube preamp? the issue is that I am a chef,therefore my electronic building skills are totally inexistent! I appreciate the idea, and saving money would be great, but I am going to have to pass.
Now , here is another thought: buy a used vintage tube preamp, and sent it to someone, like Van Alstine, that could rebuilt it with modern techniques and ingredients? Am I making sense, or just not at all?
Thoughts?
Thank you.
I've put a bee in the bonnet of a person I trust. If he can build the hybrid line stage for you, within budget, you will be contacted. Under current circumstances, I can't oblige you.
BTW, it is a good idea to learn how to execute simple checks and repairs of your equipment. A DMM and soldering equipment should (IMO) be part of every 'phile's bag of tricks.
Eli D.
You have a large number of choices.
With that budget you might consider a nice used Rogue 99 Magnum (uses 6SN7).
I had one in my hands for a short period of time and wish I could have kept it.
@ Rockandroller I owned a predecessor of your speakers the Focal Electra 936s which were analytical, detailed and yes cool as opposed to warm. I went to the tube preamp with limited success. I was still trying to find the right combination of cables and other tweaks when a friend offered me an incredible deal on some tube monobloc power amps. The sound was transformed immediately my system finally sounded the was I had hoped it would. Other audio friends would say ' wow that sounds great what did you do to the speakers' . The answer of course was nothing, almost no one guessed it was the amps which were hiding in plain sight.
I had already switched to a 6SN7 line stage the AE-3 an incredibly inexpensive piece and some Cardas cables, which did move the sound closer to what I liked, but the tube power amps was what really made the system sound great. The AE-3 was made by a Cary subdivision is out of production but Kevin Deal at Upscale Audio had them anyway for a long time.
The best advice is indeed to stop digging, you are better off getting a speaker that will be less of a problem to amplify. I liked the Focal sound a lot but it did need some softening at the edges. I had heard them with other gear in a local dealer's showroom and Audio shows where the sound was just what I really wanted, so I kept digging. That doesn't mean you should.
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