Author Topic: Adcom GTP350 pre left channel cutting out  (Read 3271 times)

Offline GraphicFX

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Adcom GTP350 pre left channel cutting out
« on: June 01, 2014, 09:48:01 AM »
Problem with my Adcom gtp350 preamp

left channel is cutting out from time to time. A light tap on the chassis usually gets things balanced. I thought I isolated the problem as a dirty volume pot, but now it seems that "jiggling" any button on the front panel fixes the problem... temporarily.

Anyone have any input as to what the culprit is? and is it a cheap fix.

Thanx in advance.

Turn off your stereo's and get some sunshine fercryinoutloud
Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

bmwr75

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Re: Adcom GTP350 pre left channel cutting out
« Reply #1 on: June 01, 2014, 10:09:07 AM »
Get a can of Deoxit from Radio Shack and clean all the pots and switches.  That will probably fix it.  If not, could be a loose connnection or bad solder joint on the front panel.

OldiesButGoodies

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Re: Adcom GTP350 pre left channel cutting out
« Reply #2 on: June 01, 2014, 11:54:43 AM »
My bet would be a weak solder joint if the pots are clean.  If I were to put a price on fixing it,  I would charge no less than four bottles of 60 minute IPA,  forum member price.  Three if you drink one with me. 

Offline GraphicFX

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Re: Adcom GTP350 pre left channel cutting out
« Reply #3 on: June 01, 2014, 12:26:20 PM »
My bet would be a weak solder joint if the pots are clean.  If I were to put a price on fixing it,  I would charge no less than four bottles of 60 minute IPA,  forum member price.  Three if you drink one with me.

Pardon my ignorance, what is IPA, and yes, I would gladly partake.
Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

OldiesButGoodies

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Re: Adcom GTP350 pre left channel cutting out
« Reply #4 on: June 01, 2014, 01:20:28 PM »
india pale ale,  a genre of beer,  my fav is 60 min IPA

Offline GraphicFX

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Re: Adcom GTP350 pre left channel cutting out
« Reply #5 on: June 01, 2014, 01:26:17 PM »
india pale ale,  a genre of beer,  my fav is 60 min IPA

Ok gotcha. Does it go with indian food?
Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

OldiesButGoodies

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Re: Adcom GTP350 pre left channel cutting out
« Reply #6 on: June 01, 2014, 01:44:21 PM »
not sure, subjective, I would go with riesling wine for that myself.  IPA beer goes well with more IPA beer  8)

Offline GraphicFX

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Re: Adcom GTP350 pre left channel cutting out
« Reply #7 on: June 01, 2014, 02:20:19 PM »
OK so now what?  should I take it in to the shop?  is the shop ready for repair work or is the move putting everything on hold?
Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

bmwr75

  • Guest
Re: Adcom GTP350 pre left channel cutting out
« Reply #8 on: June 01, 2014, 05:39:55 PM »
@OBG doesn't work at the shop.  He lives in the Washington PA area.

OldiesButGoodies

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Re: Adcom GTP350 pre left channel cutting out
« Reply #9 on: June 01, 2014, 06:01:14 PM »
I am a shop supporter but not employed by Tom.   As Scott pointed out if you can pop by house some time and drop the piece off I can look at it.  I may be able to get it done while you wait. 

PM me and I will provide my detailed contact info.