[AMRadio] R-390A Help

[W2EMN via AMRadio]

I replaced my ballast tube with a resistor 30 years ago (the internet hadn't been invented yet, and it was hard to find a spare 3TF7).  I've had no regrets, and a 40-50 ohm resistor is the simplest solution to the ballast problem.
The solid state replacement for the rectifiers is a well-documented Navy fix.
I'd bet on the filter caps being a problem, but the troubleshooting technique recommended sounds fine.

 

 

 

-----Original Message-----
From: W2xj <w2xj at w2xj.net>
To: Bill Guyger <bguyger at yahoo.com>
Cc: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Tue, Jul 8, 2014 12:45 pm
Subject: Re: [AMRadio] R-390A Help


You should really download an on line version as some have more detail and 
background information. 

I should note that every single tube in that radio can still be bought as old 
stock never used online. 

These guys have everything but the ballast tube which can be had from fair radio

http://www.vacuumtubes.net/prices.htm

Rectifiers are $20 each and the ballast is $60 while the other tubes are between 
$3&$7. That is a good reason to go solid state on those three expensive tubes. 

Sent from my iPhone

> On Jul 8, 2014, at 11:51 AM, Bill Guyger via AMRadio <amradio at mailman.qth.net> 
wrote:
> 
> Thanks to all that replied, now to go diggin'! Just wanted to see if any of 
you had any hot sports opinions before I go hunting.  Shouldn't be a real chore 
once I get time, a manual was included along with the radio.
> 
> Tnx 73 Bill AD5OL
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