02-04-2014, 05:35 PM
The 60 series uses an all triode superhet circuit and blows away the earlier TRF designs. I had both a Philco 118 and a Radiola 60 chassis on the bench at the same time, and with the same antenna every station I could hear on the 118 was also received by the 60.
The tricky part about the 60's is the IF neutralization adjustments. The IF uses two 27 triodes, so they must be neutralized to prevent oscillation, just like in a Neutrodyne TRF. When I first fired up my 60, It oscillated with whistles and motorboating whenever the volume ( RF and IF gain control ) was turned up more than half way. Aligning the IF transformers and neutralizing the stages transformed the radio, and it could be turned up to full gain with no instability.
The 60's also use a regenerative RF stage. There is a regeneration control called the "compensating condenser" which you turn up until it oscillates and then back off the setting. This setting makes a tremendous difference in the sensitivity of the radio, especially at the high end of the band.
After I completed the adjustments, I was astounded by how well the radio performed, especially since it is otherwise unrestored. I would keep your 62 as it is quite a unique radio and far advanced over other designs of the time.
The tricky part about the 60's is the IF neutralization adjustments. The IF uses two 27 triodes, so they must be neutralized to prevent oscillation, just like in a Neutrodyne TRF. When I first fired up my 60, It oscillated with whistles and motorboating whenever the volume ( RF and IF gain control ) was turned up more than half way. Aligning the IF transformers and neutralizing the stages transformed the radio, and it could be turned up to full gain with no instability.
The 60's also use a regenerative RF stage. There is a regeneration control called the "compensating condenser" which you turn up until it oscillates and then back off the setting. This setting makes a tremendous difference in the sensitivity of the radio, especially at the high end of the band.
After I completed the adjustments, I was astounded by how well the radio performed, especially since it is otherwise unrestored. I would keep your 62 as it is quite a unique radio and far advanced over other designs of the time.
