The complete Amp Supply product line was an ever evolving beast. A late A
model may have had some B circuitry, A B had some C and a C had several
production changes.
On top of that changes were made on amps returned for service.
I was a dealer for several years and it was always fun figuring out what
Denny would do next. I still service them and had a B panel with mostly C
internals in here a few weeks ago.
Carl
KM1H
----- Original Message -----
From: <Gudguyham@aol.com>
To: <hphillips@mho.com>; <Amps@contesting.com>
Sent: Monday, October 29, 2007 12:42 AM
Subject: Re: [Amps] LK550-ZC
>
> In a message dated 10/28/2007 10:48:30 P.M. Eastern Daylight Time,
> hphillips@mho.com writes:
>
> Can someone tell me what the difference is between the LK550-ZA or
> LK550-ZB to the LK550-ZC?
>
> Thanks,
> K7XM
> Hugh
>
>
>
> Usually the difference was ZA was a straight amplifier with no protection
> circuits like an Sb-220. The ZB had some protection circuits like High
> plate
> current shut down, the ZC had several more protection circuits, Like High
> SWR
> shut down, high grid current shut down. Other than that they are pretty
> much
> the same. At least that was so with the LK-500 series. Lou
>
>
>
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