sunn coliseum bass amp

[jerry]

Have a Sunn Coliseum bass amp but it has no marking on the back to tell me what the jacks are for. The 2 middle jacks are
for speakers but the other 2 jacks i don't know. I think one is for preamp out and one is for power amp in. Can someone tell
me?
Thanks.

[Don T.]

Hello:
 You are right about those jacks as long as you are talking about coliseum bass and not coliseum 300. Just plug an unterminated plug or cord into one of the jacks. If the amp quits then it's the power amp in jack. If it continues to play then it's the pre-amp out jack.
Don T.

[Steve]

Yo -- newbie here!  I have an ancient Coliseum Slave amp that belongs to our bass player. It hums. I believe the measured voltages off the two power supply filter caps ought to be +50 and -50, not the +50 and -35 measured. Schematic would help! Know a good source? Thanks!

If it's worth anything, I recall the jacks on the back of the Slave as Speaker Out, Speaker Out, Preamp In/Out, and Footswitch...

p.s. I did find a schematic for a Sunn SR6100 mixer-amp -- $5 from Fender. When I find the address I used I'll see if they have the Coliseum. (But $free would be better!)

[Steve]

Oops!  The back panel jacks I mentioned were for a Carvin amp I'm reworking.  The Coliseum Slave has four jacks on the back, all for speakers.  The more you plug in, the more power out -- up to 320 watts into 2 ohm load. (This one still hums.)

Steve