[R-390] Caps

[rbethman]

This has gone on FAR too long!

I purchased a large bag from Perry Sandeen.

I also purchased complete replacement kits from Dave Bingham.

These and others I purchased from Arcadia Electronics here in Virginia 
HAVE BEEN metalized film capacitors!

They have been rated at 600V or 630V.

I've used these in R-390As, SP-600s, and misc. Hallicrafters pieces.  
(Apache, Mohawk, and DX-60.)

*IF* there has been "self healing" taking place, I *certainly* have not 
had ANY indication!

All of the above ARE tube based.  Yes, Hollow State!

I have had ONE failure in one R-390A.  It was the frickin' audio tube 
that shorted and took out a 2W carbon resistor!  Absolutely nothing else!

This has become utter insanity!

I've had WORSE issues with plate blocking caps!  Those that are some 
brown molded *crap*, not the red resin ones, can't even keep their value 
sitting on the shelf!

Every single Brown Beauty of Death has been removed from the '51 
Contract Collins!  All replaces with the aforementioned metalized film 
types.

Bob - N0DGN


On 4/29/2013 12:59 PM, quartz55 wrote:
> So what are people using on the AF board?  The OD will not fit on the board, or rather you can't mount the module on the chassis.  I found some TDK X7R MLCC that may be appropriate for the bypass caps i.e. FK22X7R2J104K, digikey has them for $1.71.  Mouser has the rest in .01, .033 and I think .047. The size is right.  What about using the MLCC X7R on the audio board?
>
> Dave
>