Posts: 7,215
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
Those values are fine. Going up a little is ok, on the set that are from the late'20s-early'30s use quite small value caps like 1 or 2 mfd. These sets need to have caps that are very close to the original values. Higher value caps will increase the hv drastically.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 72
Threads: 2
Joined: Jan 2018
City: Madrid, Spain
Thanks for the info, now I ordered the electrolytic caps on the schematic doesn't specify the voltage rating of any wax cap, I can see some 400v so I will order all the same, I have a bag of mkt (red radial ones from china) rated 630v, anyone has try this caps? Are reliable enough for this type of radios?
The rubber or PVC insulation of the wires are surprisingly in good condition so I will leave them, the antenna coil I soldered the thin wire broken and now I have continuity between each pair of lugs so I suppose is ok now, I used a little bit of hot air to melt again the wax to cover the repair, I have to find if the values are ok but my meter is not working now for some reason...
The running cap was removed greased and cleaned and at the same time the chassis, looks very good with only some light acid and wd40.
Next step will be try to find something suitable for the light diffuser that have a black spot, I think the lamp is too big for this radio.
I post some photos of the progress
Best regards
https://ibb.co/MNVTsJv
https://ibb.co/hmQRvpm
https://ibb.co/qxV0tZ1
https://ibb.co/wwkbxZW
https://ibb.co/fDWWR2r
https://ibb.co/RCrq23f
https://ibb.co/MB1FWKZ
https://ibb.co/ccDP7tH
https://ibb.co/KLZSsqD
https://ibb.co/y5zQzYr
https://ibb.co/dpKXQsT
https://ibb.co/K2QyJmB
Posts: 7,215
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
The e caps are a little confusing. The rectifier circuit is known as a voltage doubler so in theory the output voltage should be 200vdc. The diagram sez much less. I would use 250v caps for C-104A & B. The foil/paper caps the 630v are fine.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 72
Threads: 2
Joined: Jan 2018
City: Madrid, Spain
The 3 e caps installed looks factory ones and all are rated 150vdc in the shell, one of the wax caps is full of bubbles and a bit fell melted in the cabinet, not sure if was because of age leaking or other reason. I will follow your advice radioroslyn and will pick 250 volt rating to be on safe side.
About other thing I tried to find a photo of the bottom of the set with the dark cardboard to see how is it (mine is missing) but no luck, anyone has a photo to make me an idea how is it?
Thanks
(This post was last modified: 04-22-2020, 04:22 PM by
Jeepeto.)
Posts: 72
Threads: 2
Joined: Jan 2018
City: Madrid, Spain
After ordering all I finally installed the electrolytics 400v rated, few cents difference so no doubt, I re stuffed the other caps using a hot air gun to remove the interiors and some silicone for the sides, only 2 resistors were far out tolerances, all changed, this set was a little crowded in some places, I found some wires with the insulation melted from factory, one specially dangerous touching the mains that at first look was only underneath but was almost nude and touching the mains post...
Only left repair the speaker, and do alignment because the power on test was ok, even I can hear (but very low volume) one station without antenna connected to the coil .
Here are some photos of the result
Best regards
https://ibb.co/9hhY9FG
https://ibb.co/tmnR2qC
https://ibb.co/dMvdSFD
https://ibb.co/z8ktN5q
https://ibb.co/kKDRJVx
https://ibb.co/frVpL5T
https://ibb.co/p4sq1PQ
https://ibb.co/zNR6Fm9
https://ibb.co/HK230GV
https://ibb.co/gjnLVTF
https://ibb.co/QHJR2hF
https://ibb.co/C2jtnCK
(This post was last modified: 04-26-2020, 02:42 PM by
Jeepeto.)
