Upgrading to real RF-service tubes (6146's come to mind :) kinda pales
when compared to that kind of mod.
Curt
LEE BAHR wrote:
Many years ago, just before Drake stopped accepting TR-4 s for repair,
my neighbor, WA5VGO sent his TR-4 to Drake for some repair. The radio
came back with three different final tubes then when shipped to
Drake. One of the three new tubes was as you described. A sweep tube
with a printed circuit on the bottom changing the pin out of the
tube. I don't know if it was a 6JM6 or not. However, the tube was
put in there by Drake. Also, the three new tubes were taller then
original and Drake had dimpled the top tube cage cover to accommodate
the extra height of the new tubes. Strange indeed, but the radio
worked just fine with these tubes.
Lee, w0vt
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