Parasound HCA-2000 Problem

[Burnedfingers]

I have a Parasound that has developed a distorted output on its left channel. Any guesses as to what the problem may be before I open it up?

I'm guessing that maybe a Fet up chucked. I think it uses 2SJ115 and 2SK405 as drivers. Anyone know a source for these? They seem to be back ordered everywhere I look.

Thanks is advance.

 

[Burnedfingers]

Parasound is running now.

What is the amplifier supposed to draw (amps) sitting at idle with no signal?

Any help here would be much appreciated. I think it runs class A for a few watts before switching to class AB.

Very nuch sounding amplifier and built like a tank.

 

[Burnedfingers]

Looks like I was a bit premature thinking I had it licked. It runs for a while and then the volume lowers somewhat on the left channel and gets distorted. It runs that way for about 30 seconds and then returns to normal. Watching a sine wave on the scope it looks normal. This happens when it is putting out around 6 watts and still in class A operation.

Any ideas?

 

[PMA]

You might ask JC directly?

 

[john curl]

Have you vacuumed out the interior? That is what I would do at first and clean the input and output contacts. Next, I would 'exercise' the interior electronic connectors and use Deoxit or something similiar on them (with the unit UNPLUGGED FROM THE WALL, of course).

 

[Burnedfingers]

John

Thanks for the reply. I have checked the connections and cleaned the contacts with Deoxit 5. The problem however still exhists. Any ideas?

 

[john curl]

I recommend that you contact Tony at Parasound. His number is: (415) 675-7273

 

[Zero Cool]

Does Tony Have an Email address???

 

[Burnedfingers]

I'm not familiar with this model but if it has relays on the output you might try checking there. The problem I had with the one I was working on was 1). No audio or 2) distorted or low level.
This problem went away when I changed out the 2 relays that are located on the back panel.