[SCCC] Amplifiers

[Dino Darling]

If you are looking for a 6M amp, I have a Henry 2006A that was highly modified by Chip Angle, N6CA. So much so, Chip took Henry's name off the amp. It has a single 3CX800a7 tube. I believe he has one of his 6M preamp in it, as well as some transverter circuits. I've never used it and I can ask Chip if could go over it with you.

We would need to have a conversation. I'm asking $1,000.00 and you'll be able to talk me down to $750.00 without a fight.

Dino - KX6D
________________________________
From: SCCC <sccc-bounces at contesting.com> on behalf of Ryan S <rzar66 at gmail.com>
Sent: Friday, March 10, 2023 12:14:59 PM
To: reflector SCCC <sccc at contesting.com>
Subject: Re: [SCCC] Amplifiers

I know this probably doesn't help you but there is a guy on YouTube that
has a series of videos building a 10kw mono band 6 meter amplifier from
scratch. It is pretty interesting.

https://youtu.be/6gQA3z9yyd4

Ryan W6ZAR

On Fri, Mar 10, 2023, 11:59 AM Bill Kendrick <kendrick.w at ca.rr.com> wrote:

> I have a KPA 1500, one of the first. It was a rough start because of an
> intermittent short in the 6 meter yagi. They did modify the fault detection
> and it kicks out much faster now. The only issue I see is it gets hot.
> Since
> there are only two devices the heat is dissipated in a small footprint. The
> amp heats up really fast. In FT8 I put it in standby when it hits 70C. It
> normally runs between 45 and 63 C. Even in CW when I contest the amp hits
> 70C when I am running Qs. The fans have 3 levels and at 70 it sounds like
> the amp is going to take off and fly around the room. Otherwise, it is
> pretty quiet. My Astron 50 amp switching power supply is the real noise
> maker in the shack. You can run 1500 on FT8 but why? Typically on 6 meters
> 800 watts will do for the Es European opening. Finally, to hit full output
> you often have to draw 60 amps and the fault limit is 62. On 40 meters if
> you move frequencies the VSWR changes and that number is often exceeded.
> Even if it isn't the output power fluctuates with frequency. I find myself
> operating at 1300 watts to avoid any issue. No big deal. If you want to hit
> it hard you just remember to back off when you move to another station.
>
> Now, the Expert 2K-FA is probably the most reliable solid state amp on the
> market. You can break it but you have to far exceed the spec limits.
> Several
> guys on DXChat have it and they say it never exceeds 40 C or so. It has
> other features like multiple antenna ports and it is quiet enough. It has,
> I
> think, 8 transistors in 4 modules so the heat is distributed. The drawback
> is that you can not run full power in digital modes. It throttles itself
> back to medium (they have three bias settings) after a certain time period.
> Still, not a big deal!
>
> Bill
> N6RV
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