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Loss of volume do I have an Amp problem? Help with diagnosis

I would clean the relay. My JVC JR-S400 mkII did the same thing yours is doing. I solved the problem by removing the little plastic cover over the relay. I sprayed a few thin strips of paper (about 1/8th inch x 4 inches) with contact cleaner, and with the unit off, and the volume turned all the way down, I slid the paper between the contact points. Turn the receiver back on so that the two points make contact (with the paper between them), then slide the paper out. Do this 3 or four times with all contacts.

I hope that makes sense and you get your Scott up and running again!
 
The Dual 1246 has one of those "goofy" cartridge mounting plates that are removable from the head of the tonearm to facilitate quick cartridge change/install. It has contacts on it that mate with contacts in the tonearm head. I believe you have some extremely dirty contacts/connections between these 2 assemblies. When you first play a record, the initial "blast" of current (small as it may be) will pass thru the dirty contacts, because it is an in-rush type of current. However, as time goes on, the corrosion between the contacts begins to overcome the signal integrity and the signal begins to fade, as the resistance between the mating contacts overwhelms the micro-volt signal.

Aside from your new amplifier problem, I believe that dirty contacts between the tonearm assemblies was your initial problem.

Wayner
 
UPDATE, UPDATE, UPDATE Thank you all for your help. After considerable frustration,indigestion and aggravation I just started flipping switches back and fourth and after flipping the bypass switch a few times voila we're back to fantastic sound. I can't tell you how much this means to me since since listening to music is my only pastime.

Thanks for the heads up Wayner I will be cleaning those contacts on the dual.
 
What you did was going to be my next suggestion for the receiver. Those damn record monitor switches are right in the signal path and are a source of problems. Most people do not record anymore, so the switch seldom gets moved. This is a great spot for contacts to get film on them and not pass signal. I myself try to remember to hit all of the switches on my stuff every once in awhile.

Glad you've figured part of the problem.

I would say that 85 to 90% of the time, electrical problems with equipment is actually a mechanical problem, either with switch contacts, relay contacts, potentiometer wipes or interconnects.

'ner
 
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