Many PAC-5s and 8's had a dual voltage transformer so it could be used
several ways.
Ive converted standard 800A's to QRO by using a couple of spare cable wires
to a vacuum relay to select either voltage with a front panel switch as did
the Denny special 800C's. With 3CPX800's they crank serious power and are
also a favorite of the EME crowd when converted to 6M.
Carl
KM1H
----- Original Message -----
From: "Sam Carpenter" <Sam@OwensCommunication.com>
To: "'Carl'" <km1h@jeremy.mv.com>; "'Rob Atkinson'" <ranchorobbo@gmail.com>
Cc: <amps@contesting.com>
Sent: Monday, February 20, 2012 8:46 AM
Subject: RE: [Amps] amp supply lk500 za
>I had one of these early in production. I ran it very very hard on 20 and
> 75m. As I remember, it had 4 fans with the lower tier below chassis floor
> to
> cool pins and socket underneath. I always ran fans at high speed during
> high
> duty cycle and never had a problem. For rag chewing and typical SSB
> contacts
> around 1200 watts or so, it stayed plenty cool on low speed and made
> almost
> no noise.
>
> The PAC 5 is pretty cool to have (massive xformer, external). You only net
> around 3150 V B+ on the 3-500Z which is not so much, BUT that same PS
> plugs
> into the LK800 and makes it go wild. I think the stock supply was less
> than
> 2300V on the LK800.
>
> There were a lot of folks that bought LK550 and Denny would let them
> "Trade
> up" just the RF Deck for the LK800 and he was not shipping an amp that
> would
> do to much, basically an active tuner.
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Carl
> Sent: Saturday, February 18, 2012 3:32 PM
> To: Rob Atkinson
> Cc: amps@contesting.com
> Subject: Re: [Amps] amp supply lk500 za
>
> The nice thing about them is that they come with the PAC-5 and vacuum
> relay.
> Performance isnt so efficient on 10M so its often easier to pull a tube
> and
> realign the input as for a LK-500. The difference in power wont be heard
> on
> any band unless you had 150-200W to drive the 3 tubes.
>
> Prices usually start around $1500 for a nice one.
>
> The NT version is a bit of a PITA and Ive converted many to Tune versions.
> Many of those can be found cheap with fried caps and tubes.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Rob Atkinson" <ranchorobbo@gmail.com>
> To: "Carl" <km1h@jeremy.mv.com>
> Cc: "Charlie Young" <weeksmgr@hotmail.com>; <amps@contesting.com>
> Sent: Saturday, February 18, 2012 11:32 AM
> Subject: Re: [Amps] amp supply lk500 za
>
>
> How common is the LK550? What do they usually sell for?
>
> tnx
>
> Rob
> K5UJ
>
> On Sat, Feb 18, 2012 at 8:43 AM, Carl <km1h@jeremy.mv.com> wrote:
>> Ive had my 500ZC since new in 1986 and it still has the original Eimacs
>> that have been thru lots of contests and DX pileups.
>>
>> For regular laid back CW and SSB I run on LO speed and havent lost
>> anything.
>> Its a great amp and you dont see many come up for sale and they are
>> usually
>> in the $1200+ range for a nice one. Add a few hundred more if it has the
>> external PAC-5 transformer and vacuum relay options.
>>
>> Carl
>> KM1H
>
>
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