[Amps] HF2500 HV supply...

[John Lemay]

Patrick

I had a Commander II.

I thought the HT voltage was low, but the problem was the voltage divider
resistors had changed their value over time, and so the front panel meter
was quite inaccurate.

I suggest you check your HT with an external meter first.

Be careful, be safe !

73 de John G4ZTR


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Patrick Egloff
Sent: 12 February 2009 21:14
To: amps at contesting.com
Subject: [Amps] HF2500 HV supply...

Hi all,
The HV of my Command HF2500 is rather low around 1800-1900V (shown on the
meter) and drops down to 1500V, thus limiting the output power.

I wanted to check the HV supply components to see if somehting is wrong with
one or more diodes and/or capacitors. At my surprise, these components are
inside the pressurized grid compartement of the tubes.

If this is not a bad idea because it keeps the components cool, it is a VERY
BAD idea to have forgotten to make an easy access to them !
I will have to remove half of the amplifier to have a look on these
components... Tubes, connections to tank coil, tuning shaft, etc..... have
to be removed ! There i no access from UNDER the cabinet...!!!

So before i start this hard work, i want to know if someone has done this
before and has a good advice ?
Also, can someone give me the diodes and exact capacitors reference ? Trade,
model ?

The manual i have is VERY poor. You need a binocular to read the diagram,
the part list is uncomplete, etc...

Maybe it's because i have serial number 232 ?

Thanks for any help and advice(s)
73, Patrick

-- 
Patrick Egloff - TK5EP
email : pegloff at gmail.com
Web page : http://tk5ep.free.fr
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