Unless tested at rated voltage or even with drive the rest is guesswork.
Carl
KM1H
----- Original Message -----
From: "Patrick EGLOFF" <pegloff@gmail.com>
To: <amps@contesting.com>
Sent: Friday, March 04, 2016 1:34 PM
Subject: [Amps] HL2K high input SWR on 21 MHz
Hi all,
I have a HL2K amplifier (pair of 3-500Z) for several years now (got it
second hand) and it always had a high input SWR on 21 MHz. I matched it
with my TS850 antenna tuner, so it was OK.
During last contest i had a problem on 40m (500pF/2kV in output tank
shorted). So i had to open the amplifier and while being there i wanted to
see what's wrong with this SWR.
I couldn't reduce the SWR in adjusting the capacitor.
I removed all components used in the input tank and checked them. They are
all perfect.
Coil is 0.34uH and caps are as marked and on diagram.. Input C = 150 pF
and
output adjustable up to 200 pF.
So now, i'm stucked....
On all other bands, the input SWR is just fine, so i suppose there is no
problem with the tubes or anything else in the amp. I have full power and
everything is stable.
Does anyone have a HL2K and can confirm that it is OK (or not) on 15m ?
Any idea on what could be wrong ?
73, Patrick
--
Patrick Egloff - TK5EP
email : pegloff@gmail.com
Web page : http://www.egloff.eu
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.6189 / Virus Database: 4540/11776 - Release Date: 03/08/16
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|