[R-390] SSB Adapters and Treetop Circuits

Tue Jul 5 17:11:25 EDT 2022

Brian,

I have a Collins 75A-2 ( two) with an SSB adapter I think from treetop circuits. Glad to send further info when I can (now at library away from computer that has all that stuff).

Suggestions:
KEEP the CV571s, both. 

The "silent below 8 mc" situation is well understood: failure of the 17 kc crystal/oscillator in the little octal plug-in oven. (Take that thing apart and remove/reseat the crystal, replace the tube that oscillates at the 27 mc frequency, clean band switch.)

See R-390 Pearls of Wisdom. 

Roy. 

Roy Morgan
K1LKY Western Mass
K1LKY68 at gmail.com

> On Jul 5, 2022, at 11:43 AM, brianpepperdine brianpepperdine <brianpepperdine at sympatico.ca> wrote:
> 
> I am intrigued by this info...if in part only because the originated fellow is from Ontario, like me!
> However at this point I have two working TMC CV-571 units at hand... I was going to sell one but the guy wanted MINT condx adapter so I figure I just will hold onto the redundancy.
> Sadly, my 390A stopped working below 8 Mhz... I have looked into it somewhat but as I am recovering from abdominal surgery it will be sometime yet before I hefting a 390A around and about. I might hand it off to my ham friend to look into fixing it.... he knows them...but still face the issue of getting the radio out of the house. Maybe my brother in law can be enlisted as brute force mechanism........but I really should look into it first just in case its a bad cap in that part of the IF deck.....
> tnx
> Brian VE3HI  Toronto ON
> 
> 
>   ------ Original Message ------
>   From: jwkoest at charter.net
>   To: sandeenpa at yahoo.com; r-390 at mailman.qth.net
>   Sent: Monday, July 4, 2022 9:19 PM
>   Subject: Re: [R-390] SSB Adapters and Treetop Circuits
> 
>         Perry,
> 
> Glad you made your escape.  Life is good here in the eastern part of the country! We are blessed to live in eastern Tennessee.
> 
> Joe/W4NSA
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of Perry Sandeen via R-390
> Sent: Monday, July 4, 2022 1:18 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] SSB Adapters and Treetop Circuits
> 
> Yo List,
> We escaped Californicate in Aug 2021 and now have bought a house in Clinton, SC.
> We chose this area as I'm working with Glen Scott who owns DSM Labs.
> Glen is a list member who for 24 years has specialized in re-maning mostly R390A for people who contact him directly. He also does R388's, R390's, R392 and rarely R389's and R391's.
> Glen also does repairs on some other types of equipment. He wrote and article on how to re-do R39X series of front panels.
> Unfortunately for the moment, serious health issues have had him from doing any work.
> My plan is to start re-maning and upgrading SP 600's which unfortunately is way behind schedule because of house and family medical issues.
> There are several SSB conversion circuit in the Y2KR3 manual.  A number of SSB circuits from the past postings are not viable as the necessary parts are not available.
> I'm in negotiation with Bob Thomas who owns Treetop Circuits to buy his complete operation. There is another list member who is interested in working with me on making the same SSB adapters using a different name.
> It would probably be 2 to 3 months before we would have products for sale.
> Two very expensive and hard to find are the Sherwood (almost impossible to find) and Hammarlund HC10 SSB adapters.
> Whether or not it's worth the effort to do the revised Captain Lee circuit depends what level of skill, determination and tools one has.
> Regards,
> Perry KM6FQV
> 
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