[Boatanchors] Heath DX-100 modification information and other transmitter service information

[lee]

Ray,

The B model had the newer smaller/lighter cabinet, the nickel plated 
chassis, and was pre-punched for the SSB adapter mod needed to use their SSB 
adapter on a DX-100.  It also had the latest totally variable loading 
capacitor without the switch and fixed cap scheme in the earlier version. 
Today, one sometimes adds a spot switch, broader audio response mods, maybe 
solid stating the power supply (mixed bag), and sometimes allowing the VFO 
to run constantly when operating CW but I don't like this mod.  There are 
other mods one could do such as add a third 6146 to the rig, but I would not 
do this as it would be hard on the transformers and screw up the tank 
circuit Q.   A worthwhile addition would be installing a neutralizing wire 
in the transmitter.  That's about it.  There was not much difference between 
the earlier version and the later one.

Lee, w0vt



-----Original Message----- 
From: RAY FRIESS
Sent: Sunday, October 30, 2011 9:06 PM
To: Glen Zook  ; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Heath DX-100 modification information and other 
transmitter service information

I have a dx 100B that I am about ready to get ready to put back on the air. 
Did the B model incorporate all the mods when it came out? ---------- Sent 
from my Verizon Wireless mobile phone


-----Original Message-----
From: Glen Zook
Sent: 10/30/2011 8:14:38 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Heath DX-100 modification information and other 
transmitter service information
I have been asked several times in the past couple of weeks for information 
on various official modifications (Heath recommended) as well as things like 
the tube pin voltages (which are not included in the manual) and general 
transmitter servicing information.  This information was gathered over 50 
years ago when I had my first DX-100.  Some of this information was widely 
distributed but other information was not widely distributed.  However, all 
the information came directly from Heath (when growing up I lived about 35 
miles from the Heath plant on Hilltop Road in St. Joseph, Michigan).

I have added a link on my website with all of the official Heath 
modification information on the DX-100 that I have.  Also included is the 
tube voltage information and a Heath pamphlet on general transmitter 
servicing.

http://k9sth.com/uploads/Heathkit_DX-100_mods-1.pdf

Glen, K9STH

website:  http://k9sth.com
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