Quote:
is this amp work well with T1? And how does it compa
re to Beyerdynamic A1 Headphone Amplifier & T1 if anyone know?
http://home.arcor.de/p32r/heafi/7.jpg
Input signal stage (small board with WIMA-s and relay) has safety device that does not allow to high input signal to pass through. BCL does not have that.
Supply has the same regulators (topology) but I think that I see a choke or something that allows soft start... I can not see clearly from this picture. BCL does not have that, but has resistors as "cold start current limiter". The same crap that has use only first second when you turn amplifier ON.
Amplification is achieved through the same topology as is in BCL/LC except that here we have "separated" opamps (dual mono). Probably there are two BCxxsomething as small signal transistors and BDxxsomething as power transistors. Stereo separation is, probably, better and handling with signal is also better. Transparency? Who would know that...
Trere is a lot of WIMA MKT capacitors that I am aways trying to avoid, because they sound like crap - they tend to have too metallic and too artificial sound. Some people love them because they give feeling that everything is "clear and precise". Yes, if you like House, Techno and crap like that...
Around opamp, I think that I see ceramic capacitors. They are good for "taking out the trash", but not in the signal line. Maybe this is mica capacitor?
On input I see cheap MKT Wima that sounds "metal and harsh" (explained before).
Resistors are stock, metal film Vishay Beyschlag that are "usuall product" in every good German vacuum cleaner...
Pot is ALPS as in all other amplifiers.
Honestly, for 900 EUR I expected much more. And my conclusion is the same, as it was for BCL.
I would replace all this resistors crap from signal line with Takman REY or PRP. Also I would replace big WIMA crap with Vishay MKP and small one with german Styroflex. In PSU circuit I would put Vishay MKT 1822 (or MKC because they can withstand high temperature without degradation).
In headphone output, instead this metal film rubbish, I would use Koa Speer (ex Kiwame) or Allen Bradely.
As input DC blocking capacitors I would use good (big) MKP caps or combination PIO/Polystyrene.
Electrolytic caps are in all aplifiers the same - crap. Usually Panasonic FC (Not FM - FM is just a cheap elco with low ESR good only for supplies.) and good Phillips/Vishay are sufficient for this. High temperature caps are always better because butique crap like Elna, Muse and Black Gate would not tolerate high temperature too much.