i used to grind them dry on a flat diamond steel (knife sharpener) and wipe down with alcohol ..
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don't know if anyone followed up on this ---
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This was a question on the Mil Surplus mailing list:
Has anyone tried using the GRC-109 on AM ? I notice its cathode keyed though the osc and pa are keyed together. I further notice that the 10 pin keyer socket with its plug shorts the osc and pa cathode together, so, using another plug one could ground the osc cathode separately while then cathode modulating the pa. Also, on the same plug the pa screen volts are accessible, so the pa could be screen modulated.
Has anyone tried this ?
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hell - i had to look the rig up on the net to refresh my memory of what it is - got one or two in my collection of mil stuff along with tons of other various things