ENGL Blackmore "massive" feedback-HELP

[soundguruman]

Also, using a tube damper can help quite a bit. I like the foam one from the hot rod deluxe.
It's called a tube retainer, made out of high temp foam. Works pretty well for a cheap add on.

[Bruc]

Hey there!
I registred to this forum only to give my point of view regarding your feedback problems on Blackmore. The thing is, that I also own Engl Blackmore, I also play only the 4th channel and I also have problems with feedback. Here are some solutions, that might help you:
- turn down gain knob: 9 is basically the same as 12, but it helps :-)
- turn down presence knob, 9 must be max.
And here is in my opinion the most usefull solution, I came up with: always stand with your back turned to amp :-)
I had some live situations, when the amp was behind my back and everything was OK. On one occasion, I had amp on my left and the feedback was terrible, but as soon as I steped out of amp's ''line of fire'', it got much better.
And of course, always use NS between guitar and amp.
I also had no feedback on channel 1-3, but this channels sucks :-)

Hope, that this would help you.

[tedmich]

there has to be something up with the NFB circuit in this amp, as its only in for the Lead channel via RE6. Its pretty much the same as the Screamer (E335)
http://www.freeinfosociety.com/elect.../Engl_E335.pdf
but with 2 added series resistors; 56k & 4.7k. If its not PFB (doubtful!) then jumpering the 56k would put a bit more NFB into the PI and maybe tame the feedback issues in the lead channel, but maybe Ritchie wanted it to "scream"??

course it seems almost all Engl users are used to feedback issues and run ISP gates, some noticing big changes after 1-2h of use
http://acapella.harmony-central.com/...kmore+feedback

[Jazz P Bass]

It very well may be the NFB circuit.
Here is a quote from the OP>::As far is i remember i get most of the feedback when i turn up the lead prestance so could this be the problem that you just described? "
From what I think the presense control does, setting the control at "0" gives you the most negative feedback in the circuit.
When the OP turns up the presense control, the guitar feedback gets worse.
This makes sense.
Turn it up, less negative feedback.
More guitar feedback.