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Bad Trimmer or Bigger Problem?
Bad Trimmer or Bigger Problem?
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Old 9th July 2008, 02:15 PM   #1
daggerlee is offline daggerlee  United States
diyAudio Member
Join Date: May 2007
Default Bad Trimmer or Bigger Problem?

Modded a Trends Audio T-Amp yesterday; changed tank caps, input caps, RCAs and speaker outs. Nothing too wild.

Turned it on and measured DC offset at the output. On the Left output it was a little high (4 mV) so I tried adjusting it using the trimmer. When I did, the offset fluctuated wildly, going as high as 70 mV. When I got it to around +10 mV, I noticed that the slightest touch would send it fluctuating anywhere between +15 mV and -15 mV.

Is this a bad trimmer, or a symptom of a larger problem? Should I start by switching out the trimmer, or does anybody have suggestions for another area to start troubleshooting? Thanks very much.
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