11-23-2019, 05:07 PM
This morning, I resumed work on the Zenith with the 2nd IF transformer.
Here's a shot of the one Greg sent me next to the set's original IF transformer.
The replacement looks just like the 2nd IF from the 6-S-254. It, like the 6-S-254 2nd IF, does not have the spring shield over the grid wire. Yet the part numbers for both of these IFs are exactly the same.
When I added new wires to the replacement 2nd IF and put it back into its (freshly polished) can, I also installed the spring grid wire shield. I assumed there was a reason it had the wire shield originally.
Here's a look after it was installed:
A final under-chassis view, or, Take 2 if you will:
Yes, I used new plastic covered wire to replace the original IF can wires. Why? Two reasons: (1) the AES cloth covered wire is really too thick for this job; and (2) the original wires were solid, and so are these.
Now for a speaker, with a good audio output transformer, to try this Zenith out.
I quickly found the answer in a Philco 89B cathedral I had bought at Radiorama in Cincinnati back in June.
The K-7 speaker's field coil measured 1096 ohms. The output transformer primary was good as well!
I put together a new speaker cable, using the base of a long-dead 5-pin tube as the speaker connector. I removed pin 3 from the old tube base, installed four cloth-covered wires, twisted the four wires together into a cable, and soon had it all together.
more...
Here's a shot of the one Greg sent me next to the set's original IF transformer.
The replacement looks just like the 2nd IF from the 6-S-254. It, like the 6-S-254 2nd IF, does not have the spring shield over the grid wire. Yet the part numbers for both of these IFs are exactly the same.
When I added new wires to the replacement 2nd IF and put it back into its (freshly polished) can, I also installed the spring grid wire shield. I assumed there was a reason it had the wire shield originally.
Here's a look after it was installed:
A final under-chassis view, or, Take 2 if you will:
Yes, I used new plastic covered wire to replace the original IF can wires. Why? Two reasons: (1) the AES cloth covered wire is really too thick for this job; and (2) the original wires were solid, and so are these.
Now for a speaker, with a good audio output transformer, to try this Zenith out.
I quickly found the answer in a Philco 89B cathedral I had bought at Radiorama in Cincinnati back in June.
The K-7 speaker's field coil measured 1096 ohms. The output transformer primary was good as well!
I put together a new speaker cable, using the base of a long-dead 5-pin tube as the speaker connector. I removed pin 3 from the old tube base, installed four cloth-covered wires, twisted the four wires together into a cable, and soon had it all together.
more...
--
Ron Ramirez
Ferdinand IN