Thanks for raising the issue. I have a 1200 and it's reading low HV
also and, in addition, the plate current meter is not registering at
all. I suspected the resistors were the issue in both cases. Now
you've confirmed it. I have yet to open it up since 6M has been so good
lately.
73, Joe
K2XX
John Lemay wrote:
> Hugh
>
> I think you are entirely correct. When I bought a Commander amplifier a few
> years ago, the first thing I had to do was to replace that chain of
> resistors. Good luck !
>
> John G4ZTR
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of hduff@cogeco.ca
> Sent: 16 July 2007 19:49
> To: amps@contesting.com
> Subject: [Amps] Commander plate voltage readings ?
>
> Is there a known issue with low plate voltage readings on Commander
> amplifiers ?
> A friend of mine owns a VHF-1200 and a VHF-2000. Both read quite low on the
> front panel plate voltage meter. i.e. 1900v
> on the meter while an HV probe shows it to be more like 2600v.
> It would appear the voltage divider resistors changed through
> age/overheating stress. Seems like a bit of a job to
> change them out since they're buried in the internally accessible input
> compartment.
>
> 73 de Hugh VA3TO
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|