Marshall 9000 Series Preamp issue

[z28man24]

Hello all,

Just wondering if someone could give me some advice. I have a Marshal 9000 preamp. The crunch and lead channels seem to be working fine, sound wise, although volume seems severely reduced. There is however, no clean channel. What I get using the clean channel is VERY low volume and distortion. Any ideas? I have a 100 watt Alesis power amp and this thing used to vibrate the floor. I could never turn it up all the way. Now, maximum volume wouldnt wake up a sleeping baby. Doesnt seem to be any issues with the power amp

 

[scozz]

Hello all,

Just wondering if someone could give me some advice. I have a Marshal 9000 preamp. The crunch and lead channels seem to be working fine, sound wise, although volume seems severely reduced. There is however, no clean channel. What I get using the clean channel is VERY low volume and distortion. Any ideas? I have a 100 watt Alesis power amp and this thing used to vibrate the floor. I could never turn it up all the way. Now, maximum volume wouldnt wake up a sleeping baby. Doesnt seem to be any issues with the power amp

I see no one has offered an opinion of what’s going on with you preamp, I’m bumping your thread to the top for a fresh start, so to speak. I don’t have an answer to your problem, but have you checked the tubes?

 

[EADGBE]

Maybe it's a dirty switch or a bad tube. When was the last time the tubes were changed? You may want to take it to an amp repairer.

 

[z28man24]

I see no one has offered an opinion of what’s going on with you preamp, I’m bumping your thread to the top for a fresh start, so to speak. I don’t have an answer to your problem, but have you checked the tubes?

I have not, would a burned out tube cause loss of volume and clean channel?

 

[Harlequin tusk]

change the 3 tubes, unit is pretty old, I have one of these

 

[Dogs of Doom]

I have not, would a burned out tube cause loss of volume and clean channel?

it could...

 

[z28man24]

change the 3 tubes, unit is pretty old, I have one of these

any idea what model number tubes it would need and where to purchase?

 

[Harlequin tusk]

Let me open mine and see whats inside, I'll be back

 

[Harlequin tusk]

Here is what mine has, all the same pre tubes. Go online and do a search and buy these, or another brand.

 

[capnpat]

Hello all,

Just wondering if someone could give me some advice. I have a Marshal 9000 preamp. The crunch and lead channels seem to be working fine, sound wise, although volume seems severely reduced. There is however, no clean channel. What I get using the clean channel is VERY low volume and distortion. Any ideas? I have a 100 watt Alesis power amp and this thing used to vibrate the floor. I could never turn it up all the way. Now, maximum volume wouldnt wake up a sleeping baby. Doesnt seem to be any issues with the power amp

They're is a switch on the back push it to the left +4