Hi group,
I was a very bad boy!! I enjoy building and testing solid-state tube replacements for the Drake R-4B just for fun but I screwed up. I carelessly plugged a new (including solder short) version of the SS-AU6 for the Collins S-Line into the socket for V8 - the 6HS6 mixer and smoked R51, the 150 ohm resistor, while I was testing a bunch of newly built SS-HS6's. I test-tacked a new resistor into the circuit and replaced all of the SS-tubes with real vacuum tubes known to be good but still have low sensitivity and can't find anything else obviously wrong.
I checked with the big guns of Drake repair and they are backed up for a good while with prior repairs so I figured to try more troubleshooting myself while waiting for an opening to send it out.
Any ideas on what else I can check?
My fear is that in order to smoke R51, I may have also have smoked the insulation on the windings in T-3, changing it's value and function.
In that event, does anyone have an R-4B T-3 available in their spare parts bin?
Oh well, live and learn. It's been 20 years since I regularly worked on Drake 4-Line equipment and my skills have become quite "tarnished" in the interim, sort of like a B-Line copper chassis. ;-)
TNX ES 73 DE MIKE WA3WOM K
