Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on December 11, 2010, 07:43:20 am
-
From an old transistor television I recovered this transformer
220v / 15v
secondary has a section of the wire of 0.035in (0.88mm)
I've seen transformers (PT) with the secondary winding
1) wrapped on the primary
2) wrapped (in a separate neck) near the primary
and OT
3) primary and secondary wrapped alternating each other
this transformer is of the first family but has a big difference
between primary and secondary there are at least 6 mm of free space, only air there (and something that I think is as to control overheat)
Have you never seen something like that ?
which is the reason for that unusual way to wrap windings ?
there are particular advantages to do that ?
If there are advantages why we don't see often this architecture ?
Thanks
Kagliostro
-
Somebody was REALLY worried about primary to secondary shorts.
Did not want the TV chassis to EVER be directly connected to the wall-power.
If it was 2V-6V it might be for the 20,000 volt end of the CRT or the HV rectifier. But it's too big, 15V is unlikely, and CRT/HV heat was usually a few turns on the horizontal scan transformer.
Unless there is some unusual situation or law, this construction is just expensive.
-
Maybe it was designed for short periods of high current, with forced air cooling. Not enough voltage for arc welding though.... Auto battery charger?
-
Thanks PRR & Tiny_Daddy
those was a little, "transportable" television but there were no batteries
so
Did not want the TV chassis to EVER be directly connected to the wall-power.
that is the answer
Kagliostro