[Amps] Amp Supply Amps

[Carl]

Amp Supply made good amps with quality components, my 1986 LK-500ZC still 
runs the original Eimac tubes. Output with 80W of drive is still 1200W, even 
on 160.
It came with the external transformer option and a vacuum relay and never 
burped during many years of contesting and DXing. Used a lot on AM these 
days; good anode color keeps them happy and gettered.

The NT series were designed for those who stayed put on nets, etc and didnt 
have much tuning ability.

If an amp doesnt have sufficient  L or C adding to the LOAD cap does 
nothing!!  Add C to the TUNE cap to get actual rsonance first and then deal 
with the Load cap for proper grid current..

Use a GDO if you understand them.

The NT can be converted to a regular amp by buying the variables from 
Ameritron as well as RF fixed value caps as needed.. I did that with many 
LK-800NT's as those tubes are too fraagile for many to deal with and cheap 
medical pulls are long gone.

Carl


----- Original Message ----- 
From: "gudguyham--- via Amps" <amps at contesting.com>
To: <tom.hellem at gmail.com>
Cc: <Amps at contesting.com>
Sent: Tuesday, December 15, 2020 4:58 PM
Subject: Re: [Amps] Amp Supply Amps


> The LK5OOnt is good for nothing in my book. You have to select a frequency 
> in each band that you want to optimize the output and then load it for 
> that frequency on each band. It will work ok “ on and around “ the 
> frequency you load if for. QSY too far and the power drops off the further 
> away from the loaded frequency. This amp is good for a net control 
> operator who operates the same frequency all the time on different bands 
> and other such “channelized” type operation. The LK800 on the other hand 
> is a powerhouse amp with 3 3cx800 tubes. Good for 3kw easy or loaf at 
> legal limit. Has a big external transformer. Nice amp. Both amps however 
> do not work very well on 160 because they lack sufficient inductance. It 
> manifests itself by seeming to always want more capacitance. You can pad 
> the load indefinitely with more C and it still won’t be enough. There is 
> no substitute for the correct amount of inductance. A few vintage amps 
> suffer from this. Similar is the TT Centurian. You get what you get on 160 
> and that’s it. I had a ***mint*** LK550ntc I couldn’t sell it at a bargain 
> price. I could have “stuck” somebody with it for a decent price if I didn’t 
> offer to interrogate the buyer to see if he knew exactly what it was. Lost 
> every sale when I explained that amp throughly. The LK800 is a gem 
> however.
>
> Sent from AOL Mobile Mail
> Get the new AOL app: mail.mobile.aol.com
> On Tuesday, December 15, 2020, Tom Hellem <tom.hellem at gmail.com> wrote:
>
> Recently inherited a LK 800C and a LK 500 NT from the estate of an SK.
> I know nothing about this particular brand of amp.
> Any input from members of the group would be appreciated.
>
> Are they worth keeping around? Are there known issues with either of 
> these?
> The grid current meter seems not to work on the LK800, and it seems to
> require full mesh on the loading and plate tuning capacitors on the low
> bands, feeling like there may not be enough capacity to really realize the
> output that the amp is capable of.
>
> The LK500 is a no-tune amp because it has a separate output network for
> each band, adjusted by the factory I presume. Does anyone know if the
> output networks need to be tweaked for full output after a number of years
> of use?
>
> Thanks in advance for any thoughts or suggestions.
>
> Tom
> K0SN
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