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[TenTec] Substitute PA final transistor replacement test successful

To: "tentec@xxxxxxxxxxxxxx" <tentec@xxxxxxxxxxxxxx>
Subject: [TenTec] Substitute PA final transistor replacement test successful
From: Curt Benjamin via TenTec <tentec@xxxxxxxxxxxxxx>
Reply-to: Curt Benjamin <k8aicurt@xxxxxxxxx>, Discussion of Ten-Tec Equipment <tentec@xxxxxxxxxxxxxx>
Date: Fri, 26 May 2017 01:38:19 +0000 (UTC)
List-post: <mailto:tentec@contesting.com>
I picked up a 546 Omni D, series B at Xenia that the seller said worked but had 
a stuck PTO so I figured it might be an easy fix and maybe something I could 
sell to a new ham who wants a starter rig for HF. I managed to clean up the PTO 
so it's all greased up with Super Lube and working great but I later found that 
the finals were bad. 

I have been saving a pair of PA finals from a VHF, low band Motorola Maxtrac 
for such an occasion to try out. Knowing that xistors that are designed to 
operate class C would probably not operate well with bias applied, I figured 
I'd try them anyway - heck, I suppose I could keep it a CW-only rig until I 
find some suitable xistors. 

Well, they are holding the correct bias current and it's transmitting 110W out, 
and getting good audio reports on fone. Not too shabby for a set of free finals 
salvaged from some old Motorola radios.
I still haven't checked it on a spectrum analyzer but I figure I'll take it 
into work soon and check it out when I get a chance. I suppose the IMD 
characteristics are inferior to devices that are designed for this application 
but if it's reasonably clean and legal, what the heck.

Curt, K8AI
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