[R-390] R-390 POWER SUPPLY

[Dan Merz]

Clearance,  not that is of great importance at this point,  but is this a
390 or a 390a?  Without knowing much more,  I would venture this is the
transformer or one of the two chokes making this noise.  Others on the
reflector may have other ideas.  You can buy a replacement power supply from
Fair Radio for $25 (without tubes, but presumably good otherwise) for the
390a,  and it could be a complete replacement or used for parts but you'd
have to identify the specific part before swapping.  Since your plug-in caps
and tubes are presumably ok,  you could just swap those into the Fair supply
and see if that does the trick.  Much cheaper than shipping the radio for
repair and the power supply is pretty easy to swap out.    I don't know of a
source for the 390 power supply if that is the radio you have but Fair may
have specific parts for the 390 if you can identify which one you need,
maybe by feeling for the part that is vibrating.  By the way if you want the
general population on the reflector to see suggestions/responses from you,
you should "Reply to all" rather than just "Reply",  your choice.  Best
regards,  Dan.   

-----Original Message-----
From: CLARENCE LOZANO [mailto:JEEPER at netins.net] 
Sent: Monday, May 30, 2005 12:27 PM
To: Dan Merz
Subject: Re: [R-390] R-390 POWER SUPPLY

ALSO DAN,I AM NOT BLOWING FUSES,WHEN VOLUME IS TURNED ALL THE WAY DOWN -I
STILL HAVE THE HUM COMING FROM POWER SUPPLY
----- Original Message -----
From: "Dan Merz" <djmerz at 3-cities.com>
To: "'CLARENCE LOZANO'" <JEEPER at netins.net>; <r-390 at mailman.qth.net>
Sent: Monday, May 30, 2005 11:15 AM
Subject: RE: [R-390] R-390 POWER SUPPLY


> Clarence, hi.  Is this sound coming thru the speaker or is it a 
> vibration coming directly from the supply transformer and apparent 
> with the volume turned completely down?  From your description, "not 
> ac sound",  I take that to mean that it's not  ac line hum coming out 
> the speaker,  which is generally fixable by capacitor replacement.  
> Are you blowing fuses?  Dan.
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net 
> [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of CLARENCE LOZANO
> Sent: Monday, May 30, 2005 8:00 AM
> To: r-390 at mailman.qth.net
> Subject: [R-390] R-390 POWER SUPPLY
>
> HELLO,I HAVE A R-390 POWER SUPPLY MAKES A HUMMING SOUND-NOT AC SOUND 
> ,IS THE POWER SUPPLY REPAIRABLE WITH THIS TYPE OF PROBLEM?
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