[Boatanchors] Two questions

[Al Klase]

Howard,

The HRO-500's are rather temperamental and trouble prone.  I sold mine 
in frustration a while back, and I consider myself a 
more-than-competent  repair technician.  The place to start is to pull 
out and reseat all the plug-in transistors, perhaps adding a little Deoxit.

Good luck,
Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 4/22/2015 10:56 PM, Howard Ritter wrote:
> I have two problem BAs that I’m trying to rehabilitate for eventual sale as I’m downsizing my life and home. Any suggestions?
>
> 1. A National HRO-500. This was working properly the last time I used it several years ago. Firing it up now, I get no audio and the Phase Lock light stays on at most frequencies.  Where to start?
>
> 2. A TMC GPR-90. This was also working properly when last used several years ago. Now I get a very loud 60 Hz hum in the phones as soon as power is applied. The volume does not vary with adjusting the volume knob and is so loud that I can’t tell whether there’s any audio underneath. Is this a recognized failure mode for hollow-state receivers? Something shorted in the audio output circuit? Tube? Capacitor?
>
> Thanks for your suggestions. I’ll report back.
>
> —howard n7exn
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