Kenwood TR-7950

 This is a Kenwood TR-7950 2 meter rig I got in a batch of stuff. It was pretty dirty, but powered up. I gave it a bit of cleaning, serviced the controls and switches, replaced a few lamps, and aligned it. The reciever and transmitter stages came right up to spec and the radio worked great. The LCD display has moisture ingression around the edges, and needs a header cable (ribbon cable), but the rig was otherwise fine. I fabricated a power cord, wired a mic to it, and had a usable 2m rig :-) . Here's a few pics and video...

Browning Baron Repairs...

 This is a Baron SSB CB radio I repaired for a friend. It was in generally good condition, with the exception of the PLL falling out of lock, and needing a good alignment. 

The initial PLL problem was due to contaminated wax that was poured onto the PLL circuitry. Once the wax was removed, the PLL was stable and could be properly adjusted. I cleaned and lubricated all of the controls and switches, and gave the radio a full alignment. Not much info and support documentation exists on the internet for this radio, but I found the main board to be almost identical to a Cobra 132XLR...so much so, that the alignment procedures worked nicely. 

Here's a few pics...the first pic of the radio is one I found on the web for illustration, as I forgot to take a final photo when I was finished :-) ...

Yaesu FL-2100Z Conversion

 This is another Yaesu FL-2100Z that I converted to Russian GI-7B triodes. This is a straight forward conversion... Remove the old tubes and tube sockets (horizontally mounted), remove the bottom mounted fans, install new sockets in place of the fans, power supply mods, install a bias control circuit, installed two fans to cool the filament connections, two additional fans to cool the anode connections, mods to the tuned input, relocated the output padding caps, installation of a high voltage interrupter, etc. That's all :-) Here's a few pics and info...

This is a version of the bias circuit I used in this conversion.

A fuse was installed in the cathode circuit.

Protection installed on both panel meters.

I wired it for 110v operation.

Tube socket used in the conversion...

Sockets spaced below the chassis...

Sockets spaced carefully, to allow anode clearance between the plate choke and chassis wall. 

Relocated tank padding caps.

Plate bypass cap...

Testing the HV supply and interrupter...

Interrupter and glitch resistors installed...

Bias switching transistors...

Connections between filament choke and socket...

Fans to cool base of tube sockets...

Voltage doubler for DC control circuit...

HV interrupter (L), glitch resistors (R)...

30w drive used to test tuned input and for initial tuning...

Bias transistor...

Tuned input with capacitor changes in place...

Mod to tank circuit on 10 meters...

HV transistor for bias control.