Hallicrafters S-36A Rebuild (Continued)
| For those that have been following this rebuild, I ran into some problems with the RF Assembly. It turns out to be a tricky little number. I was getting poooor sensitivity over the bands and found that wiggling the band switch for starters caused huge changes in sensitivity. I tore the whole RF Assembly apart again and started the rebuild from scratch. For starters I discovered that a number of the wafer contacts had lifted and were intermittent. This as a result of pushing the shaft through all those wafer sections. I also ended up rewinding several of the coils in the RF assy. I did a little component rearrangement to try and minimize stray capacitance etc, and I soldered a lot of the ground connections to the chassis. I also discovered the band switch shaft was slightly bent, this was causing it to not line up and consequently would excessively push the wafer rotors causing the contactors to open up and make intermittent connection. I completely reassembled the RF assembly and the straightened shaft slide right through the wafer sections with no problem. The band switch now operates correctly. Next will be tuning up the RF amp, Mixer, and Osc stages of the assembly. |