[Elecraft] KPA500 & Drake TR7

[Walter Underwood]

I know nothing about the TR7, but I searched the web for "drake tr7 output power adjustment” and found this useful-looking page, with photos.

http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_ALC_Control/TR7%20ACL%20Control.htm <http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_ALC_Control/TR7%20ACL%20Control.htm>

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 14, 2019, at 7:56 PM, Gary Smith <Gary at ka1j.com> wrote:
> 
> I hesitate to answer to this, it's been so 
> long since I had a TR7 (My 2nd rig) and my 
> memory of it is not clear.
> 
> Given this disclaimer, I believe you'll 
> find an adjustable piece, two wafers with 
> a rectangular key hole in the center part 
> to turn it. Cap or resistance, I don't 
> recall what it was, but it controlled the 
> output and you could lower it way down or 
> get more than the rated output with it (at 
> the expense of the transistors if you 
> pushed it too long).
> 
> I wish I could remember exactly where it 
> was, but I believe it was on the heatsink 
> or close to it at the back side of the 
> rig. Might have been blue, I'm not sure, 
> maybe it was accessible from the outside 
> of the radio, from the bottom rear? I 
> think I'd remember it if I saw the TR7 
> again, the adjustment was in plain sight. 
> 
> I suspect if you backed it down you'll be 
> fine with the output from the KPA-500.
> 
> For some time the TR7 was used for EME, 
> the person who bought mine was modding it 
> for that and perhaps in an EME group 
> someone might have good knowledge of the 
> TR7 and where this was exactly located.
> 
> 73,
> 
> Gary
> KA1J
> 
> 
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