Trident 80b Eq Oscillating

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R

RSRecords

Well-known member
Joined
Jun 8, 2009
Messages
320
Having an issue with a trident 80b Eq hi mid band oscillating. It only happens with full boost and frequency right around 4khz. Tried swapping opamps but no dice. Ive had similar issues when an amp goes but the difference here is that it only oscillates when the frequency is at a specific point (~4khz).

Any clues?
 

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It is sometimes worth checking the capacitors like C22 or C26. Cleaning the pots can help too.
 
mjrippe said:
I have only seen that in Trident modules where someone "hot-rodded" the chips.  Are yours the original TL07x?
Click to expand...

Hi, it had LF351's in the eq section. I popped some tl071's in there to see if that was the issue. Seems like it changed the frequency where it oscillated slightly but was still screaming.

psych60s said:
It is sometimes worth checking the capacitors like C22 or C26. Cleaning the pots can help too.
Click to expand...

I'm going to try cleaning the pots better and see if helps. Thanks!!
 
Worn pots where wipers lose contact at a dead spot can affect EQ stability... (caveat this is mostly a guess as I haven't messed with Tridents hands on).

JR
 

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