02-10-2019, 10:44 PM
All tubes checked, installed, and slowly powered up. Stations all across the dial, though low volume and distorted. At least I had something to work with. I discovered the wiper contact on the treble control had a low resistance short to ground. This caused the bias on the audio driver tube to vary from -14v to ov as I turned the selectivity control. Fixed that and the radio works great... almost. One dead band (1.5-7.6 mHz band). The oscillator dies and there is total silence. Before I reassembled the tuner chassis I had checked all coils and all measured ok. I hope I don't have to remove and disassemble the tuner chassis again to find the problem! It's a pain and it would be difficult to test without reassembly. Otherwise, it tuned up great and performs admirably. It's nice to have a signal first shot out of the box. It gives you something to easily troubleshoot. I think this will perform as good or better than my Scott 16. The magnetic tuning is interesting and works quite well. Once it locks into a station, you have to tune quite far off to get it to lock into the next station.