[Milsurplus] I came upon a R390A/URR EAC

[Bill Carns]

That is just a slow blow in all probability.  Read the numbers stamped on the metal fuse end for the value.

 

From: Michael Holdren [mailto:mhdesign at gmail.com] 
Sent: Thursday, February 04, 2016 1:56 AM
To: Bill Carns <wcarns at austin.rr.com>
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] I came upon a R390A/URR EAC

 

This is a little bit greek to me, so thank you for the follow-up. 

 

I just pulled out the fuse in the back, and it’s like nothing I’ve seen before. Looks like some string or wire is wrapped around the material inside the glass. I’ll have to research this as well.


Thanks,

Michael




 

On Feb 4, 2016, at 1:38 AM, Bill Carns <wcarns at austin.rr.com <mailto:wcarns at austin.rr.com> > wrote:

 

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 <mailto: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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