Diagnose the problem with my amp

[Blue Fury 10+ year member]

I have an old school memphis Belle 6-ch amp. Here is what I know for sure:

-Channels 1-4 work fine. (4x75@4)

-Channels 5 and 6 have possible the same problem, but 6 has it worse. (2x150@4 playing 80-250hz)

-Channel 5 works maybe half the time at start up

-Channel 6 never works on start up.

-Power/ground/remote is secure and is 4awg.

-Both speakers are connected properly.

-Both speakers have power from the amp (I know this for a fact)

-Neither speaker is blown, both have good coils and leads.

-The RCAs are good and both send signal (again, I know this)

-If I play a tone within range of the band pass and gradually turn up the volume to about 80% up to the volume I set my gains at, channel 5 will play a bit of static like it has a loose connection then play consistently at full output (with respect to the HU volume level)

-If I play the same tone at the volume that the gains were set at or maybe a notch higher, channel 6 will emit very little ticks of static. I want to turn it up higher to 'bring it to life' like the 5th channel, but I don't want to cause any more problems.

I've never pushed this amp hard or anything, I've treated it with a lot of care. It's got to be something in the amp but I've never dealt with amp problems before. What could it be?

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[Blue Fury 10+ year member]

bump

 

[Blue Fury 10+ year member]

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[Grinder1989 5,000+ posts]

Bad pots or loose connections internally.

 

[Blue Fury 10+ year member]

Whats the best way to ID exactly where the problem is? Test the connection at every solder joint with a DMM starting at the RCA?

 

[Grinder1989 5,000+ posts]

first turn every pot on the whole amp back and forth very fast. This will clean them. If any are really hard to turn, they are probably bad. If the problem persists, you have a bad connection.