This radio has been on my list for a long time.
This Kutztown, I got lucky: Joe Koester had it for a very reasonable price, and when I looked at it, he immediately dropped it down to a mere $100. That was the offer I could not refuse.
I have published some photos before; the bezel (escutcheon?) has a little viewing window damage.
I opened it up. The opening is a learning process.
Then I decided to remove the tuning assembly.
If only for gaining access to the capacitors' can.
Plus the grommet is bad, and one of the two grommets on the two shafts (volume and the switch) is missing.
That comes down to removal of two wires and a Grounding braid.
So, below is the bottom of the chassis
Front
The chassis on the stand near the Riders (Good thing I have it: the NA somehow does not have the 37-604)
And, the last, the assembly removed
Now to the recap. First the regular caps, then the can.
Oh...at a minimum, the choke on the left, one of the two filter ones, is open and one wire was cut.
I have my work cut out for me.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Interesting set on several levels. Interesting that it uses a bias cell for the 6Q7 grid. Wonder why they did not use the field coil as part of the power supply filter, putting it across the B supply instead? Did they get better flux that way? First time I saw an AC-DC radio use 2 chokes.
Good luck with the restoration, the radio is a looker.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
MrFixr- look at the schematic for the Philco 650 from 1936. Two chokes. Think of the weight and power dissipation. But look, when one burns open, you have a spare, installed.
I am about to order tuner grommets and washers from RR.
There is one more part I need: it is a shaft bushing. Or maybe flanged sleeve bearing.
There are two: one goes over the volume shaft, and the other over band switch shaft.
They are sentering the shafts in the two brackets extending from the tuning assy.
It is a hard plastic, made in a shape of centering tuning support grommet.
RR does not make them.
Any ideas?
It cannot be any rubber: it should not create friction a rubber would against the rotating shaft.
I just googled 1/4 inch flanged bushing and got a bunch. Teflon, nylon, plastic, brass and rubber. Other sizes available. Didn't expect the large variety.
Mike;
Those button cells are carbon zinc cells that were produced, and marked by P.R Mallory, and were somewhat of an engineering "FAD" in the mid to late 1930s. Canadian Rogers, and Canadian Marconi built sets used a lot of them, typically two of them, one being on the wiper of the volume control. Personally I think it was a scheme for companies to avoid paying patent royalties, likely to RCA, though that would not have mattered in Canada as all companies belonged to a patent pool. Anyhow there are some modern watch or coin cells that are a viable substitute, except that you have to reverse the polarity of the holders because on the watch cells the exterior is positive and the center is negative, Apparently you can revive the originals by dropping the cell into boiling water, though I have not tried this.
Regards
Arran
Well, button cells like LR41/LR44 of 1.5V would do. But there are no holders for them. The holders I see hold minimum 2 cells. I only need one.
So I decided to go with a AAA one.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
I saw this site yesterday; I hold Amazon prime, and so my shipping is free, so if I buy something for $1, it will be $1, whereas in other places I would have to pay shipping.
I do if I have to....like yesterday with Renovated Radios.
Keystone is, of course, good reputable source, which is the only one I use in my designs at work (usually bought from Mouser for the prototypes and then our CM will by elsewhere from their sources). Amazon, unfortunately, sells off-brands, but a $1 plastic AAA holder is most times OK to buy from anyone, though I saw one I decided not to buy on Amazon - I did not like the way the negative spring looked.
My question is, why no one seems to sell a single-cell holder of small button cells like LR41? I literally left no stone unturned. Minimum it was 2-cell.
Frustrations, frustrations.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
What if I buy this, cut some 2-3mm slit and make a split bushing out of it, that just might fit.
I am not, after all, using it as a bearing, it is a sleeve for the shaft.
What do you guys think?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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