From: Garey Barrell 
Subject: Re: [drakelist] TR-4 Status


Ken -

There are some inconsistencies in your description.

The early TR-4's had the "soupcan" filter, same as used in the
TR-3.  The "can" 
is a rectangular folded tin, 1.5 x 1.5 x 2" long.  But this filter has the 
switch  _inside_  the can along with eight crystals.  There are two wires coming 
out of the can to control the lamps indicating sideband, and two 2 conductor 
shielded lead for input and output.  Later units used two rectangular filters 
similar to the ones used in the T-4 series (but at 9 MHz vs 5.645 MHz CF) 
mounted to a vertical bracket behind the switch which was mounted to the front 
panel.

So if the switch is mounted in the front panel, you probably need the filters 
such as those made by Inrad or from a junked later model TR-4.  Unless the 
previous owner removed the switch from the can.

The manual photo you are looking at is probably the later unit, with the two 
filters mounted vertically  _through_  the rectangular hole in the chassis where 
the soupcan was.  If you look at a photo of the bottom of a TR-3, you'll see the 
soupcan version.

73, Garey - K4OAH
Atlanta


Ken, WA2LBI wrote:

> Good morning to all,
> 
> Thanks to all who responded to my request yesterday for a LSB filter for the
> TR-4 I had just obtained. The situation had changed. To review, yesterday
> afternoon I received an inoperative TR-4 that I was told just had the LSB
> filter removed to repair another functional TR-4. When I opened it up last
> night I discovered the entire filter "soup can" is missing
along with a 12BA6
> (I haven't checked to see if I have one). The filter selector switch appears to
> be intact and the leads to the filter are still neatly hanging where the can
> should be located. I have never worked on a TR-4 so I don't know exactly what
> the can and mounting hardware look like. The picture in the manual isn't very
> helpful.
> 
> In light of the above development I now need the entire soup can, any mounting
> hardware, and both the USB and LSB filters. Does anybody have the entire unit
> available? If not, do you have the can and mounting hardware? I can contact
> others who responded yesterday and offered one/both filters.
> 
> It has been suggested by more than one respondent that I use INRAD filters as
> they are much better. I do agree but at $110 apiece I would be putting $220
> into a radio that is known to be inoperative for unknown reasons and still
> require troubleshooting. What is the going price for a working TR-4 in good
> condition, maybe $300?
> 
> Thanks for any and all assistance and/or advice.
> 
> Ken, WA2LBI
> wa2lbi{at}arrl.net
> 


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