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 producing 60 watts output into a 50 ohm dummy load. I have a new double capacitor can from hayseedhamfest.com to replace the original can capacitor.
The home made 100Khz calibrator PC board. I designed the calibrator PC board using Express PCB CAD software and Express PCB made the PC board. All the calibrator parts, including the metal HEX stand offs and mounting screws, washers, and nuts, were found and purchased on eBay. The calibrator PC board is mounted on the top rear of the chassis using 3/8″ dual female HEX Metal stand offs. The circuit is an exact duplicate of the original HRA-10-1 plug in calibrator except it’s not a plug in. The stand offs provide the chassis ground for the 3 connections B+, Filament, Output. The stand offs are held in place by #6x32x1/4″ Phillips Head machine screws and #6 internal star washers. The 3 wires are connected below the PC board then fed through the HRA-10-1 octal socket guide post hole. The wires are then connected below the chassis allowing the front panel switch to control 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 then performed a full restoration of the second HR-10B which you can see by clicking the HR-10B full restoration page link above.
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 voltage was obtained by rectifying the 6VAC filament voltage and filtering through a PI capacitor input filter. The filtered 6VDC is then applied through the Function switch tabs 4 and 5. Now the Function switch no longer switches 260VAC but rather +6VDC 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 rubber grommet to dampen the relay switching noise just a tad bit.