Pre amp tube covers

[artisandon]

I'm having problems with my Egnater Renegade head. It's making a high pitched noise like a mild feed back. I bought this head used and it did't have the covers over the pre amp tubes. I replaced the preamp tubes and after still having the same issue I swapped the power tubes with my other Renegade not solving the problem. Does anybody know if this could cause this problem not having the shields over the tubes. HELP!

 

[shimmilou]

Take the covers from your other amp and put them on the trouble amp and you might have your answer.

 

[MississippiMetal]

Assuming you've ruled out external causes, A steady squeal that isn't guitar-related feedback is likely oscillation, and could be due to a number of things from lead dress to a failed/failing component. I would suspect a faulty electrolytic cap, possibly in the preamp B+ supply, but not necessarily.

 

[BadBluesPlayer]

The lack of tube shields should not cause that problem.

 

[Anonymous]

The lack of tube shields should not cause that problem.

not necessarily true. i currently have a microphonic RFT in V1 of my tourmaster that just sounds too good to get rid of....how do i know its micro? without the tube shield on it, it squeals like a piggie!

the spring holds it down from vibrating enough that it doesnt squeal when the shield is in place.

i'd suggest starting with a spare 12ax7 and going down the line in your amp (use one of the 12ax7's from your other renegade) and see if this is a problem.

if not, report back.