Help! I need a part number for a Crown PSA2 XH Variable Resister

[20hz]

Hi, I have a PSA 2 XH that needs a "resister trim network". It's located at RN4 which translates to part # D4445-9. Does any know the value of it or an aftermarket part number for it?
Thank you kindly in advance,
Tom

[clmrt]

Did you call Crown?

[20hz]

I did. I still haven't received a call back from them. But the main reason I would like to find it locally is because the piece only weights 1 ounce and cost .35 cents but their new shipping rates state they will charge $10 to get it to me.

[BMWCCA]

Did you call Crown?

You might also want to try the Crown forum. There are a few knowledgeable DIY folk there plus a couple of Crown employees. Check it out: http://www.crownaudio.com/forums/

[subwoof]

the service manual and schematic are online here:

http://www.crownaudio.com/gen_htm/legacy/legacamp.htm

The RN4 is a trim resistor WITH 2 additional resistors as part of it's ceramic substrate. There is no commercial equivalent. And the volt regs are NLA.

And I doubt that it is .35 - I remember them being a lot more and there is a good chance they are NLA.

sub

[20hz]

Subwoof,
I'm going to call Crown today and hope I can still get two. What is one to do when these parts start failing, use the amps as door stops since these parts are NLA? It would be such a shame.

[subwoof]

The resistor you need is part of the LV circuit in the power supply. A competent tech can easily use new style regulators with common trimpots. I have had to do this a number of times over the years.

Be sure to replace the big 'lytics too. Also on the main board there is a 20K precision resistor that balances the temp / fan circuit. They drift high with age and cause the fan to go to high speed too soon. Replace it with a new one or a pair of 10K in series.

sub