my class a preamp

evilspirit · 27th June 2004, 06:18 AM

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

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

27th June 2004, 06:18 AM	#1
evilspirit diyAudio Member Join Date: Mar 2004 Location: dd	my class a preamp

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27th June 2004, 10:30 AM	#2
blu_line diyAudio Member Join Date: Jan 2002 Location: The Netherlands	Nice ! Especially your casing

27th June 2004, 10:58 AM	#3
tcpip diyAudio Member Join Date: Jan 2003 Location: Mumbai, India	Aren't all discrete transistor preamps Class A? I thought only (some) opamp-based preamps operate in Class B.

28th June 2004, 12:43 PM	#7
tcpip diyAudio Member Join Date: Jan 2003 Location: Mumbai, India	Evilspirit, your preamp looks very classy. Why do you have that huge heatsink inside a preamp?

28th June 2004, 02:41 PM	#8
evilspirit diyAudio Member Join Date: Mar 2004 Location: dd	because of the high quietude carrent

30th June 2004, 01:23 AM	#10
evilspirit diyAudio Member Join Date: Mar 2004 Location: dd	final assembled static currency 130MA per channel