[obcbeatle]

Hello:

I have a HK A-402 amp that I have been using since the 70's. The left
channel recently started to lose volume and sometimes renders no volume
at all. I can depress the Tone Defeat switch on the 402 front panel to
sometimes get the left channel signal back, but it still usually is not
as loud as the right channel. Also, it usually reverts back to
rendering little to no volume, over time. Does this sound like
something a little compressed air and cleaner (Deoxit?) might cure? I
have never had any problems with this amp so I've never cleaned it or
had it serviced. I'm sure it is pretty dusty inside though. TIA.