[GreenKeys] TT-98

[Don Robert House]

Very nice contribution Buck,

Hope you have a great year.

Don


On 9 Jan 2008, at 2:00 AM, Buck Kidd wrote:

 >>> You must have kept it greased and oiled.

You betcha! But then, it wasn't hard work, and I didn't wrench on my  
own car in those days so that was my "gear head" time.

Fred in Fort Lauderdale (Typetronics) always had the gears, or had a  
line on them. Never had to buy them from Fair Radio, who I thought  
were a bit too proud of them.

There are Four issues about this set (TT-98)  for amateur use.

1. Non-metallic gears need replacement ASAP after acquisition.  
Phenolic gears BAD. Metal gears GOOD.

2. Parts ARE rare, so a Re-Build could be lengthy and daunting with  
the end of Fred's inventory.

3. The built-in LOOP supply confuses many users. Made me nuts for a  
month. All our TU designs at the time called for the LOOP to be  
integral with the TU. Requires a bit of Field Engineering...

4. The STOP relay will develop an EMF spike of sufficient voltage to  
kill the Keying Transistor in most solid state TU's deader than Disco.  
I felt like I went through a coffee can full of 2N5655's/MJE 340's.  
Finally adapted a solid-state relay module for this purpose (motor  
control). Cleared up the problem

Mine were both ex-Federal (FAA, I think...it was 35 years ago) and  
looked pretty nice.

One of the joys of my life was getting my TRS-80 (Model 1) to output  
to it.

73 for a Prosperous 2008

DE BUCK W7LV