1960 Heathkit DX-60 transmitter HR-10 receiver and HG-10 VFO
The DX60, HR-10B, and HG-10 came home with me from the Mena Ark hamfest as a gift from a Navy Chief ham friend.
The HG-10, HR-10B, and DX60 were in excellent physical condition with only a few problems with the DX60 transmitter and HG-10 VFO. The DX60 had low output which was found to be caused by an open R18 100 ohm 7 watt resistor. The PLATE meter circuit had out of tolerance resistors and the neutralizing wire was out of adjustment. Replaced the resistors, set the Neutralizing wire in the correct position, and the DX60 now performs as it should. I have a new double capacitor can from hayseedhamfest.com to replace the original can capacitor.
The home made 100Khz calibrator PC board shown in the above pictures, mounts on the chassis using 4 dual female 3/8″ HEX metal stand offs. The stand offs provide the chassis ground for the 3 connections B+, Filament, Output. The stand offs are held in place with #6x32x1/4″ Phillips Head machine screws. The 3 wires are connected below the PC board then fed down through the HRA-10-1 octal tube socket guide post hole. The wires are then connected below the chassis and the front panel switch controls the calibrator in the same manner as the HRA-10-1 plug in calibrator. I have since found and purchased a second HR-10B receiver in fair to good condition. I plan on performing a full restoration to the second HR-10B receiver so as to bring it back to “like new” condition.
I modified the DX60’s Function TUNE/AM/CW position wiring by installing a DPDT 6VDC relay. The function switch tab’s 4 and 5 wires were connected to a set of N.O. (Normally Open) relay terminals. The relay coil source DC voltage was taken from rectified 6VAC filament voltage then applied through the Function switch tabs 4 and 5. Now the Function switch no longer switches 260VAC but rather 68VDC at 180ma. The relay was found and purchased on eBay. The relay mounts below the DX60 chassis using a single #6x32x1/2″ machine screw through a new rubber grommet to dampen the relay switching noise just a tad bit.