[Milsurplus] I came upon a R390A/URR EAC

[Bill Carns]

By the way, at 10 Vac applied, the filaments are barely getting any voltage so the rectifiers are not on - nor are you getting them up past the forward voltage threshold so you have no B+ to speak of.

 

Also check the fuse to see that some other past guy has not used a “way to high” value to see if he could find a problem by making smoke.  Bad plan.

 

Bill

 

From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Michael Holdren
Sent: Thursday, February 04, 2016 1:05 AM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] I came upon a R390A/URR EAC

 

Hi everyone, I’m new to this list. I purchased the other Collins R-390A that Hutch is talking about.

 

I have a quick question: should there be a burning smell when I power it on?

 

After inspecting the unit (looking around the insides without removing anything), I realized the radio is actually pretty clean even though it doesn’t really look like it on the top, the bottom is nearly immaculate. So I decided to try using a variac to slowly power up the radio. I went up to about 10v and after only about 5 minutes, I noticed an electronic burning smell. Could this be the reforming of the capacitors, or is it something else/bad?


Thanks,

Michael




 

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