Amps
[Top] [All Lists]

Re: [Amps] HF2500 HV supply...

To: "'Patrick Egloff'" <pegloff@gmail.com>, "'amps@contesting.com'" <Amps@contesting.com>
Subject: Re: [Amps] HF2500 HV supply...
From: "John Lemay" <john@carltonhouse.eclipse.co.uk>
Date: Thu, 12 Feb 2009 21:27:28 -0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Patrick Egloff
Sent: 12 February 2009 21:14
To: amps@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@gmail.com
Web page : http://tk5ep.free.fr
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

__________ Information from ESET NOD32 Antivirus, version of virus signature
database 3849 (20090212) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com


 

__________ Information from ESET NOD32 Antivirus, version of virus signature
database 3849 (20090212) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com
 

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>