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In the Forum: Melquiades Amplifier
In the Thread: Staxquiades project
Post Subject: Negative selectionsPosted by N-set on: 9/24/2012
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 Romy the Cat wrote:
It is unquestionably an ambiguous project. The topmost question that I would ask myself after this project would be the following: can Milq-biased 6E5P to be as good (sound-wise) DC driver as some vintage direct heated tubes. I did ask thin question myself after I implement my MF DSET but I do not have the answer.


I do not know and I don't know any-trusthworthy-body who may know. Having very very few (if any) my own reference points I proceed
by the method of KWS -- Known Working Solutions. The design is elastic, I've spent great time simulating and then specifying PSU's,
so putting a DHT driver should not be a problem.

 Romy the Cat wrote:
In regard the project as a whole. I wonder if it worth to built up something as elaborate as it proposed just to drive headphones? I do not want to belittle headphones. I like headphones myself but I can’t not lose the feeling that headphones do not need elaborate or sophisticated amplification. I had 3-4 dedicated headphone amps myself in past and have built one on my own. None of them sound good and I very mach appreciate to drive headphones from some kind of chip-based headphone jacks. Perhaps it is me but I am very forgiving to the quality of headphone drive and I would question if it worth to create a federal case about headphones.


I've been wrestling with the same question for 2-3 years myself without any better solution than to try it myself.
I have now a SS Stax amp, supposedly a very good one, but with the increasing source sophistication I feel it stands in the way.
Few more points

* I do not like listening on headphones but due to real estate constraints I have no other choice in the forseenable future, so the investment
comes out of the real need
* Staxes, esp. TOTL such as Omegas are quite outstanding and special headphones,
supposedly very amp sensitive and demanding; they may, or may not, be worth the effort--the only solution I've reached is to try;
people do use quite sophisticated amplification (mostly EL34 surrounded by tons of SS currnt sources, sinks, servos and other electronic engneering bullshit) and claim it does open new doors (Sennheiser's flagship Orpheus,the mentioned Blue Hawaii amp, Stax T2, SET's with 1:1+1 output trans,etc)...but I've never seen a no-compromise design, without all that EE bullshit and all my inquiries about the subject never got any reasonable answer apart from some sort of a fear and a sheep crowd instinct of following the old Stax designers and their modern analogs like Kevin Gilmore (the EE behind blue hawaii and Stax T2 revision...with 250 SS pieces in the design...). I think I'm on a +/- terra incognita here...
* As I mentioned, changing the output choke to an output transformer will easily transform the Staxquiades into a speaker amp with quite a few Watts
of output power, so the project can be recycled and incorporated in e.g. a dedicated multi channel amplification
* I do have some serious concerns with respect to my design, the LF stability beeing the most important one (before we even approach talking about the Sound...if any); you may rememebr I was asking you about the stability and reliabilty of 6E5, as the driver is the most cruicial element here
(for example it provides the bias to the output via the voltage drop on the RDC of the interstage choke). Again, the sims show it can work but I think I've reached the point the sims will give me no further insight



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