Hello,
Recently I bought my first Saba radio from 50ies. It turned out to be a very good bargain, as chassis condition was great - it seems that nobody was ever repairing this set, as all the capacitors were in place. Instead of EL84 was inserted EL86, which was probably at the end of her life, as capacitor between EF86 and EL84 grind wasn't replaced. But radio was on, when I came to pick it up! Thankfully nothing was burned, although output transformer now looks like it was starting to melt. But no short circuit was found.
I started the restoration by small cleaning with slightly wet cloth, as it was nothing but the small coat of dust. Chassis is shiny and pretty again.
http://saba-forum.dl2jas.com/bildupload/chassisdirty.jpg
http://saba-forum.dl2jas.com/bildupload/chassisunder.jpg
http://saba-forum.dl2jas.com/bildupload/chassisclean.jpg
Then I started the usual - replacing all tar capacitors, cleaning contacts and greasing mechanical parts.
And here's my first question - what function do have those double gears connected with some kind of spring, and how should they be put together? For the maksimum tension of that spring or around the middle?
Radio after replacing tar-C and EABC80 and ECL80 started to work without major problems. But the rocker didn't want to return to it's place. I checked two selenium diodes, voltages in the automatic part of the circuit, and it turned out that triode of EABC80 had a very small anode voltage, as grid voltage was all right. To my surprise ceramic capacitor between anode and ground had a short of ~13k, so the current was drawn mostly by him.
Now automatic search work good, but it's better when tuning from higher frequency to lower that the other way around.
Also, I didn't replaced capacitor .035uF in the AC part of the engine. It looks solid, metal can with some greenish plasticon top. Should I replace it or leave it?
And I hope it's normal for the enginge getting very warm (but not hot) even during the period of listening to the same station?
Best regards,
Peter
Recently I bought my first Saba radio from 50ies. It turned out to be a very good bargain, as chassis condition was great - it seems that nobody was ever repairing this set, as all the capacitors were in place. Instead of EL84 was inserted EL86, which was probably at the end of her life, as capacitor between EF86 and EL84 grind wasn't replaced. But radio was on, when I came to pick it up! Thankfully nothing was burned, although output transformer now looks like it was starting to melt. But no short circuit was found.
I started the restoration by small cleaning with slightly wet cloth, as it was nothing but the small coat of dust. Chassis is shiny and pretty again.
http://saba-forum.dl2jas.com/bildupload/chassisdirty.jpg
http://saba-forum.dl2jas.com/bildupload/chassisunder.jpg
http://saba-forum.dl2jas.com/bildupload/chassisclean.jpg
Then I started the usual - replacing all tar capacitors, cleaning contacts and greasing mechanical parts.
And here's my first question - what function do have those double gears connected with some kind of spring, and how should they be put together? For the maksimum tension of that spring or around the middle?
Radio after replacing tar-C and EABC80 and ECL80 started to work without major problems. But the rocker didn't want to return to it's place. I checked two selenium diodes, voltages in the automatic part of the circuit, and it turned out that triode of EABC80 had a very small anode voltage, as grid voltage was all right. To my surprise ceramic capacitor between anode and ground had a short of ~13k, so the current was drawn mostly by him.
Now automatic search work good, but it's better when tuning from higher frequency to lower that the other way around.
Also, I didn't replaced capacitor .035uF in the AC part of the engine. It looks solid, metal can with some greenish plasticon top. Should I replace it or leave it?
And I hope it's normal for the enginge getting very warm (but not hot) even during the period of listening to the same station?
Best regards,
Peter
