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Technical Tips from Mark W. Persons

Gates Solid Statesman audio console repairs

February 23, 2015:  Some might remember the Gates Radio (division of Harris-Intertype) Diplomat and Executive series of radio broadcast audio consoles.  They were built starting in the early 1970s as the first of the "Solid-Statesman" line, replacing previous designs with vacuum tubes.  The Diplomats are monaural while the Executives are stereo.
A power supply and audio modules for these consoles came in the shop for repairs and a "50 year tune-up." 
Well, it was a trip down memory lane to say the least.  They even had the smell of being vintage. 
I used a circuit card connector to get power and signals in and out of the card.
Here, a cue amplifier and Gates power supply are being worked on together. 
The clipped oscilloscope waveform shows the result when one of the output transistors was missing.
Here, an M5700 Program Amplifier is being worked on.  A special mating connector (blue on the right of the module) was configured so power, gain control, input and output wires could be attached.

The experience was a bit difficult because transistors of that era are germanium based rather and the silicon transistors of today.  In the end, it all worked out and the customer was happy.

The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons   ham W0MH      

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