07-29-2018, 10:48 PM
More investigation yesterday. I was curious as to the state of the capacitors within the I.F. transformers. (Pics to follow). Removing the easiest candidate -The first I.F.- took but a few minutes, and the can was easy to open, revealing two tall windings on a waxed paper tube. The capacitors were miniature versions of the clamped type mica style. I removed each in turn, and measured the capacitance. Expecting 100pF from the schematic, I found these were each accurately 110 pF. Too much of a coincidence for me to consider making a change to what was found, so everything was returned to place as found.
I am still not convinced that the two I.F.s peak up quite as they ought to, but am reluctant to risk causing damage.
However, the most fun was had listening to the set. With a fully operational speaker, and connected to the outside long-wire, it was performing nicely. AM reception is good to very good on the main A band on long-wire or loop antenna. Moving to the "Special service" B band, 1.4 - 4 Megs, reception seems a tad weak where it overlaps with AM. The "International" 6-18 Megs band is working well and I was able to pull in many Shortwave broadcasts, especially in the 41 m to 22 m range. This included a very nice signal from Radio New Zealand International, a not uncommon visitor to the West Coast. On to the 31 m Spread-band and this was curiously quiet, although on the wide range SW band I thought there were plenty of 31 m stations. Perhaps there is still an alignment issue, I'll check
Pretty happy so far with the set's performance, and I am just about ready to declare the chassis "done".
Ed
I am still not convinced that the two I.F.s peak up quite as they ought to, but am reluctant to risk causing damage.
However, the most fun was had listening to the set. With a fully operational speaker, and connected to the outside long-wire, it was performing nicely. AM reception is good to very good on the main A band on long-wire or loop antenna. Moving to the "Special service" B band, 1.4 - 4 Megs, reception seems a tad weak where it overlaps with AM. The "International" 6-18 Megs band is working well and I was able to pull in many Shortwave broadcasts, especially in the 41 m to 22 m range. This included a very nice signal from Radio New Zealand International, a not uncommon visitor to the West Coast. On to the 31 m Spread-band and this was curiously quiet, although on the wide range SW band I thought there were plenty of 31 m stations. Perhaps there is still an alignment issue, I'll check
Pretty happy so far with the set's performance, and I am just about ready to declare the chassis "done".
Ed
I don't hold with furniture that talks.