395 Problems

[ursinus]

I discovered that when I activate the Deep Extend on My Simul 395, it begins to feedback even if there is no signal on it. I changed all the tubes to see if it would go away, but it is still there. I also noticed if I crank it without the deep extend activated, it will do this same feedback. Any ideas? I'll take it apart tomorrow and look inside too.....

 

[disassembled]

Both channels or just 1?


Greg

 

[ursinus]

Only the channel that I select the deep extend on at first, but then both channels even without the deep extend if I used it at gigging volume.

 

[disassembled]

If it happens on both channels then it might be your tubes or possibly a microphonic cable. Have you tried plugging your guitar straight into the power amp or using a distortion pedal into the power amp?


Greg

 

[phaboo]

It could also be where your speaker is in relation to the amp. Every tube has SOME microphonic response--there are wire screens and bits in there that can vibrate. If you have tons of volume it could be enough to generate microphonics even in a good tube.

Or you could have a crappy tube.

 

[ursinus]

Well, the fix was easy.... I had my rack stacked on my Theiles. That was the problem. I put my rack back on my standalone stand- NOISE IS GONE, YESSSSSSS!!!!