15-09-2015, 07:49 PM
Yes, despite the schematics showing a single primary with no taps, it definitely makes sense for winding 2 to be the primary. Let's see if we can work out the options:
So, assuming the numbers found on RM.org are accurate, then I would double-check the voltages across each of the tappings of winding 2. It might make more sense if one of them was lower than ~50V. Perhaps 25V? If we pretend for a moment that the lower tapping - the one that is 6.0 ohms - was actually 25V, then 145 becomes 122+25V, and 220 becomes all of them minus the bottom winding. Also, 200V becomes 25+122+53V.
Still worried about the 1250V winding. That suggests a CRT, as Alan hinted earlier. Was there a version of this set that had a TV (in which case is the transformer anything like powerful enough?), or perhaps a small 'scope CRT to provide a tuning display or something?
Perhaps it was a replacement part that could work in many sets? Any Philips experts who know about sets with CRTs?
- 100V: That's the two 53V windings in series
- 125V: I think that's using just the 122V winding
- 145V: Don't immediately spot that. Perhaps the 122+53V combination? That would be about 20% too low...
- 200V: I'm thinking the 122 plus 53V, which would be around 15% too high.
- 220V: Another mystery...
- 245V: All of them
So, assuming the numbers found on RM.org are accurate, then I would double-check the voltages across each of the tappings of winding 2. It might make more sense if one of them was lower than ~50V. Perhaps 25V? If we pretend for a moment that the lower tapping - the one that is 6.0 ohms - was actually 25V, then 145 becomes 122+25V, and 220 becomes all of them minus the bottom winding. Also, 200V becomes 25+122+53V.
Still worried about the 1250V winding. That suggests a CRT, as Alan hinted earlier. Was there a version of this set that had a TV (in which case is the transformer anything like powerful enough?), or perhaps a small 'scope CRT to provide a tuning display or something?
Perhaps it was a replacement part that could work in many sets? Any Philips experts who know about sets with CRTs?
