[Amps] QRO HF2000 plate choke

[Rob Atkinson]

Okay it looks as if you'll have to modify your choke.  Here's a useful
guide on how to do that.
https://www.w8ji.com/rf_plate_choke.htm

You can get a pretty good look at what the stock choke looked like here:

http://www.qrotec.com/HF2000rev.htm
in particular this photo:
http://www.qrotec.com/images/HF2000Review/52.jpg
As you can see it was a single section solenoidal choke.

That Ameritron choke obviously works fine in an AL82 but evidently it
has a resonance in the 10 m. band in your amp.  Either the choke is
damaged or something is different about the QRO amp.  Interesting
problem that will add to your knowledge.  That's the attitude I always
try to have.

73
Rob
K5UJ

On Tue, Nov 2, 2021 at 8:53 AM John Keating <john.keating at outlook.com> wrote:
>
> Apparently a resonance. There is a burn mark in the center coil section after keying down on 28.425. It did not fry the coil but you could smell it immediately.