Fred Nachbaur wrote:

Gosh, that hardly qualifies as a "tube compressor." It's a pretty
straight-forward op-amp based compressor with a tube as the variable
gain stage.

Note also that it's only been simulated... in other words, you're pretty
much on your own.

Cheers,
Fred

What about a simple logarithmic amp for compressing?
I use one to drive a volt meter, which allows a bigger range of voltages to be
read, and in Db.
It uses a single diode in a shunt feedback path around a standard opamp.
The non linear turn on voltage of a silicon diode is exploited.
But I guess it could be done using a high gain tube amp, say a couple of 12AX7
with a CF buffer
and a transfomer and shunt FB with a diode.
I have never bothered to compress/limit anything, because whenever I see
the results on a CRO of large compression, it sounds like mud as well.
My local radio station routinely compresses its program, and the waves look like
an SET amp which is clipping badly.
This sounds awful. Other stations nearby show no sign of such radical
compression/limiting, and they sound fine.

Regards,

Patrick Turner.


marty wrote:

http://music-club.rutgers.edu/headfonz/Comp5/Comp5.html



On Tue, 02 Mar 2004 23:47:33 GMT, "Puppet"
wrote:


Hi guys

What about a simple circuit for a veryvery cheap tube preamp-compressor for
musical instruments such as bass or guitar? Most of the stuff I've found is
not "pure tube" or has an output transformer.
Is it possible to build something without silicon (except in the rectifier
stage of the PS) and without output transformers? Any suggestion? I think
that a transformerless solution would be cheap enough, and good for me even
if the schematic were not so simple...

Thanks for sharing your knowledge and for your help.

I go to bed (in Italy is 01.00 am... an I have to work in 5 hours... :-()
Puppet



--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects: http://dogstar.dantimax.dk |
+--------------------------------------------+