[TenTec] ARGOSY 2

[Winston]

As best I recall, the MRF-477 final transistors do not have insulating pads under their tabs. The tabs are emitters and they are directly grounded to the chassis, unlike most TO-229 transistors where the tabs are part of collector and must be insulated from ground.
I remember all this because of a talk I had with a Ten-Tec engineer at a hamfest. He told me about the Argosy finals and how they were different.
Hope this helps.
-de K4CWQ

Sent from my iPhone

> On Sep 15, 2020, at 12:01 PM, Mike Bryce <prosolar at sssnet.com> wrote:
> 
> Snowy and the group
> 
> on tx you should see about .7V on the bias of both final transistors. Is it there?
> 
> Mike, WB8VGE
> SunLight Energy Systems
> The Heathkit Shop
> http://www.theheathkitshop.com/
> J e e p
> o|||||||o 
> 
> A man with one clock knows what time it is. A man with two clocks is never sure.
> 
>> On Sep 15, 2020, at 11:32 AM, ROLAND HOWELL via TenTec <tentec at contesting.com> wrote:
>> 
>> 
>> Hi All, just trying to resurrect the above radio, hears just fine but it was lacking, yes it was missing, the PA entirely, i have now acquired one, i have replaced all the 'Q's ( 1 - 5) and the ic.
>> Q1-2 now 2sc2166 not MRF476, as they are the equivalent.
>> Voltages appear correct through out the board, BUT no RF out, i am unable to set the bias with R1 or R2, just nothing happening on my meter. Something not switching on?.
>> During the rebuild i have put insulating pads under Q1-2,5 as they were missing, is that correct?.
>> I have the 13.8 volts when mode switch turned to tune position on the yellow wire.
>> So gents, any and all advice would be appreciated.
>> 73
>> Snowy G0HZE
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>> 
> 
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec