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[Quoting digi01]

P.S.
Some TAIWAN diyer at andaudio.com said AD8620 is very nice!I have not experience with AD series opamp.

Zang

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Hello Zang
Certainly commentaries AD are good in simple and dual,
a simple comparison of a companion in this forum, AD single 8610 vs dual 8620, in its opinion, the dual sound perhaps a little excessive brightness, only reason that makes me think that the simple one is better for my k501(where they sin), the price almost does not have variation in both cases, another reason (that I see now) towards the single AD, is going it to dedicate to semiprofessional use, dissipating better the heat (soha gift to the musical group)
I do not know if of this form will give more power to Sennheiser of 32 ohm, this Soha can be necessary to use BUF
I request aid to you in this point and in any other suggestion

I do not have opportunity for a comparison either

Tonight I have experimented with the OPA2227,it seems that the sound is saturated before, to low volume improves the low end, anyway, encounter much more difference in the tubes, miniwatt remains ignition several seconds after retiring it, Tesla and Haltron with structure similar to the ECC81 and bulb a little wider, they are illuminated like light bulbs in the ignition, warming up plus the LM337 and with a sound a little more aggressive.
("all my opinions are surroundings to my AKGs")
been thankful to all

greetings
Fernan

As it is your opinion, R4/14 with pins, similar to tests for R6/16, after obtaining the value for 40V, adding it for R3/13 value fixed?

Greetings
Fernan

On a side note, I read somewhere about proper turn on and shut down. Sorry to sound newbish, but I unplug the cans and then shut down. Is that correct? Thanks for any clarification on this one.

Zang-
A TON of thanks, sir! I finally got this one running! Awesome work.

-Chance