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I saw the the post for a the18w marshall squealer when cranking the master & volume. Same problem with my 15W lightning, anyone have anything specific to the lightning to rectify the problem? Would switching the 500K master pot to a 1M pot help?

I am not a builder per se but I understnad that sometimes, if the output transformer primary connections are reversed, this can cause massive amounts of high freqency squeal.

Try the tranny lead switch. I remember getting a squeal on a 15 once, and we ended up using a different tranny.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

lite1 Did you ever get the squeal problem resolved? We have another 15W squealer on the forum that can use your help.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Any update? There is another squealer out there that needs some help. How did you solve the problem? or did you??

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Stephen, thanks for emailing me some suggestions. I did what you said: I swapped the leads from the output trannie to the EL84 sockets; so far that seems to have done the trick! Whistle/sqeal is gone.

I think I still may have an issue with my guitar grounding, so I'm going to take a look at it tonight. This problem happens when I just let my guitar sit in my lap and I hear a bit of a static-y noise; when I put my hand on any metal part of the guitar or the amp the noise goes away. However, it is not bad at all; in fact, no worse than several other commercial amps I've owned before. I can live with it if needed.

By the way, what a fun little amp this is! One mod I've already done by necessity: instead of having a Line Out, I just made it a 16 ohm out. I have that tap on my s2 OT, and I didn't have the resistors needed to make a Line Out, so it just sort of fit. Thanks again for the faceplates: it really makes it look good, and your layout was spot-on. The sound is awesome!
John

I ended up installing a 3-way speaker switch where my line-out should have been. Then, I have a pair of parallel outputs where my 4 and 8 ohm outs should have been.

Then I drilled a 4th hole and put the line out there.

Sounds like time for a chassis/panel re-design.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps