[GreenKeys] Homebrew TU on ebay

[Ralph Mowery]

----- Original Message ----- 
From: "Lee Mushel" <herbert3 at centurytel.net>
To: "Robert Laag" <rlaag at pacbell.net>; <greenkeys at mailman.qth.net>; "John 
Duggan" <radiounity at sbcglobal.net>
Sent: Thursday, September 02, 2010 8:07 PM
Subject: Re: [GreenKeys] Homebrew TU on ebay


> Well, Bob, or is it John?  sure doesn't look like a ST-6 to me.   Not 
> enough
> boards and surely not enough 88mH toroids gotten from Elliot Buchanan.
> When the ST-6 first appeared I couldn't afford the real thing and built my
> own version using only the purchased boards.   Then, a couple of years ago 
> I
> bought a real ST-6 on eBay and today it powers my 28ASR.  Of course, I 
> still
> have my original creation as well.

Probably not the st-6 as you said, not enough toroids. Also not enough 
switches that would be used.  More like a st-5.  Just looking at the meter 
and the switch under it.

I put together a TU from the schematic of the st-6.  I did not  have all the 
parts so redesigned the circuit somewhat.  It still worked very well.  Later 
I found a set of boards that had most of the parts installed and other parts 
in the box.  Put that together and it did about the same as the homebuilt 
unit.

About a year ago I bought a st-6 off ebay for about $ 20.  Just wanted the 
comercial version.