[Heathkit] Dx100 and 100B difference

[Glen Zook]

I did forget to mention that the DX-100B had the holes punched for the SO-239 connectors needed for adding the SB-10 conversion kit.  You had to drill those holes with the original DX-100.  To add the kit, the front panel on both transmitters did have to be drilled.


I have, on my website, a file with the instructions for adding of the spotting switch, for improved CW keying, the continuously variable antenna loading, modifying for the SB-10, the voltage reading at each tube pin (this information was not widely published, I was given the sheet while at the Heath plant by of of the design engineers on the DX-100), and other information on the DX-100 / DX-100B.


http://nebula.wsimg.com/de13bc22f82b797942847fbbafb6e51f?AccessKeyId=D1250C433DB440D6B60D&disposition=0&alloworigin=1




I grew up 35-miles from the Heath plant in St. Joseph, Michigan (mailing address was Benton Harbor but the plant was actually located on Hilltop Road in St. Joseph) and, after getting my driver's license, would drive up to the plant to "drool over" the kits.  There was a showroom on the left hand side just after going through the main door of the plant where you could purchase a kit and take it home with you.  If you had a question about anything that Heath had made, you mentioned this to the showroom clerk and he/she would telephone back into the plant.  In a few minutes, someone, usually the lead, from the design team would come out to answer your question(s).  Often, that person would take a sheet of paper and draw a schematic for making some modification that would improve the performance.  Then, they would go back, into the plant, and return a few minutes later with a paper bag full of parts to make the modification(s).  No charge!


It was during one of these visits that I got the factory sheet with the tube pin voltages and some of the other information in the file.

 Glen, K9STH 
Website: http://k9sth.net

      From: Bill Cromwell <wrcromwell at gmail.com>
 To: heathkit at mailman.qth.net 
 Sent: Sunday, September 25, 2016 10:07 AM
 Subject: Re: [Heathkit] Dx100 and 100B difference
   
Thanks Glen,

I have DX-100 (non 'A', non 'B'). I thought the B model also had support 
for the SSB adapter like the Apache has. I won't concern myself with 
acquiring 'B' model parts to add that to my archaic one. Mine is best 
used on CW and the update plans have fallen from the back burner onto 
the floor behind the stove anyway.

-crossing all of that off the speculative project list-