B15S preamp

[rzenc]

Bass player asked if it is possible to build B15S preamp only. His idea is to use it to drive mixing consoles and also a SS poweramp + Ampeg 810

Schems for REV C and REV D:

http://www.el34world.com/charts/Schematics/files/ampeg/Ampeg_B15S_RevC.pdf

http://www.el34world.com/charts/Schematics/files/ampeg/Ampeg_B15S_RevD.pdf


This guy already owns Alembic F-1X.

Have you tried such a thing?

What would be your considerations regarding such project?

My idea so far is to use complete schem from input jack to P.I. output and insert a A.C.C.F.  to provide lo Z outs.

Many thanks in advance for insights!

Best Regards
R.

[PRR]

Isn't this what the EXT AMP jack is for?

Hmmmm.... if driving a different power amp you may want another gain stage.

[rzenc]

Thanks PRR!
 I thought about ext jack as a mean to provide him an output jack for his rackmount korg tuner. So that it may be hooked fulltime without adding load to bass signal.

If I need to implement another gain stage to drive power amp, then Could I keep P.I. as is and adopt your suggestion as low Z outs? I know a picture is worth thousands of words but my pc decided to crash and I can't use/access schema Until it is good again...

I plan to use xformer balanced out for mixing board and leave AC C.F. for stage amps.

Thanks for your attention!
Best Regards

R.

[PRR]

I added a gain stage.

Stock, the design level at EXT AMP was like 0.4V. A standard PA rack-amp needs 1.4V-2V to get all the power you paid for. So I figured it had to be done.