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[AMPS] BTI LK-2000HD Amplifiers

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Subject: [AMPS] BTI LK-2000HD Amplifiers
From: measures@vc.net (Rich Measures)
Date: Sat, 23 Aug 97 23:01:30 -0800
.......
>I just picked up a BTI LK-2000D amp and was wondering if anybody else on
> this reflector has had one/used one
>in the past years. It's got a 3-1000Z tube and from what I'm told puts
>out 'just fine'.
>
>I plan to use it only between 80-20mtrs and just need your comments
>good/bad.
.......
>Before I light it up, I do plan to carefully inspect the bandswitch and
>remove all corrosion areas [if any].
>
Corrosion is not a common problem with the BTI bandswitch, Chris.  Look 
for melted/evaporated contacts and burn marks on the 
porcelain---especially at the 10m and 15m switch positions.  

>Rich: I do realize that yes it is a 3-1000z and is prone to 'parasitics' on 
15 & 10mtrs, 

I don't think so.

>...but I
> don't plan to use it up there.  ...

I have never heard of a BTI bandswitch sustaining parasitic arc damage 
during operation on 10m.  80m, 40m, 20m, yes.  

- If one uses a stock BTI with a modern transciever, the BTI is virtually 
certain to hotswitch, which means current transients---which encourage 
VHF parasites.  

- A number of BTI owners have replaced the kaput, stock electrolytic 
filter capacitors with an increased number of units to raise the max. 
voltage capability of the hv filter capacitor bank.  I recommend using 
Matsushita 100k ohm 3w MOF resistors to equalize the voltage across the 
capacitors.  They produce less heat than the original values, plus they 
are quite stable and reliable.  

A step-start would be nice, and easy too---using the original, 
molasssas-in-winter BTI t/r relay.  A schematic is available at:  
http://www.vcnet.com/measures

Rich---

R. L. Measures, 805-386-3734, AG6K   


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