[Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 35

[jim.thom jim.thom@telus.net]

Date: Sun, 2 Nov 2025 06:03:39 -0500
From: "Bob D." <ajamas.rn at gmail.com>
To: amps at contesting.com
Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7.....
        PART 35




>Please correct me if I'm wrong. I'm an old fart but novice amp constructor.
>If amp is to be used strictly with a modern exciter that employs
>"pre-distortion", I can do away with a lot of filter capacitance. Then no
>need for soft start and glitch protection, if needed at all, will not need
>to be as stout.

>Considering for my 6m amp project using a gs35b. Also, plan to use metal
>film caps in the supply. Very low ESR, self healing, don't dry out, and are
>becoming competitive with electrolytic caps, thanks to electric vehicles
>use.

>73, Bob ah7i

Pre-distortion, like the ANAN  7000/8000 if wrapped  around the amplifier,
results in reduced  IMD.
Nothing to do with the  B+  supply filtering.

Watch out with those metal film caps.   I looked at this a few months
ago.....and when they cut loose, they really go kablamo.   They are not
polarized.   I looked at several brands, and they all say  'low ESR'   yet
don't spec the exact resistance at 100/120 hz.   And none of em had a
listed spec for leakage current  nor  the most important spec of all.....
CCS ripple current at 100/120 hz.   We are only interested in the 100/120
hz ripple current spec...not the 10 khz  ripple current spec.

Without a ripple current spec, they are off my short list...at least for
now.   I can't find anybody who has used the metal film caps.

Get on the   https://groups.io/g/ham-amplifiers  group.  I posted   25 x
pix of a 2 x GS35B  6M amp. The 6M amp does 5 kw out on 50.125 mhz.
 Originally it started off as a single GS35B.

There is also a hb  8877  6M  amp on there, again, with several pix.

Jim  VE7RF