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-   -   my class a preamp (http://www.diyaudio.com/forums/solid-state/36772-my-class-preamp.html)

evilspirit 27th June 2004 06:18 AM

my class a preamp
 
http://www.andiy.com/bbs/UploadFile/...1212142344.jpg

http://www.andiy.com/bbs/UploadFile/...2121423898.jpg

http://www.firstdf.com/andiy/bbs/upl...1894915391.jpg

blu_line 27th June 2004 10:30 AM

Nice !
Especially your casing

tcpip 27th June 2004 10:58 AM

Aren't all discrete transistor preamps Class A? I thought only (some) opamp-based preamps operate in Class B.

PMA 27th June 2004 12:16 PM

Quote:

Originally posted by tcpip
Aren't all discrete transistor preamps Class A? I thought only (some) opamp-based preamps operate in Class B.
No, it depends on output stage design, regardless discrete/IC technology.

jan.didden 27th June 2004 12:51 PM

Re: my class a preamp
 
Quote:

Originally posted by evilspirit
[BPre-amp links.....[/B]

Impressive! Very well executed.
Can we have some schematic details...?

Jan Didden

tcpip 28th June 2004 12:41 PM

Quote:

Originally posted by PMA
No, it depends on output stage design, regardless discrete/IC technology.
Oh, okay. I was under the impression that anyone making line-level circuits would always build Class A to avoid crossover distortion. I thought crossover distortion (and Class B) was a necessary evil tolerated only in power amps to get high efficiency and power outputs.

Sorry if this is off-topic....

tcpip 28th June 2004 12:43 PM

Evilspirit, your preamp looks very classy. :)

Why do you have that huge heatsink inside a preamp?

evilspirit 28th June 2004 02:41 PM

because of the high quietude carrent

Jay 29th June 2004 10:41 AM

Quote:

Originally posted by evilspirit
because of the high quietude carrent

I haven't calculate, and I easily forget, but are you sure 45mA requires such a big heatsink???

evilspirit 30th June 2004 01:23 AM

final assembled static currency 130MA per channel


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