50Hz Transformer?

[Eric H]

I don't know what this came out of but I'm pretty sure it was some old TV chassis that was given to me, it's about twice as tall as the average TV transformer.

I've never (in person) seen a transformer in a TV that was this big (except some of the Sola's used in the Dumonts and they are arraigned differently).

Wiki says Much of So California apparently used 50Hz up till about 1948 so maybe it was used in something older than that, hopefully i didn't scrap a pre war chassis. Nah, I would have noticed that.

I've been kicking around the idea of getting a schematic and trying to build a tube amplifier sometime, maybe with 6BG6 outputs since I already have a pair of output transformers compatible with those, this might make a nice power source for that.

[bandersen]

I found a tall 50Hz transformer like that in a Canadian Admiral 19A11.

[Electronic M]

If that is a 50Hz unit it should run very cool at it's rated load on 60Hz.

The amp idea sounds like a fun project. I've been working on an output transformer-less tube amp project for a while now. I adapted an audiophile design to use some cheap compactron sweep tubes as the outputs. IMHO It sounds better than my tube amps that use output transformers. Though, until I get bigger lytics and possibly a hefty transformer with a 220V secondary so I can switch my PS circuit from a doubler to a full wave bridge, it has very limited output power.
I'm basically broke right now, and my design is just a rats nest of mid air connections in the process of being refined into something that I'll like well enough to build a quadraphonic amp chassis based on...once I have the funds to proceed.

Yeah, I've spent too much time reading over at AK.

[old_coot88]

The size of the iron in that looks more like it's a 25Hz. In any case, a 25 or a 50Hz transformer will be very happy on 60Hz. But not vice-versa, ie., a 60Hz unit will overheat on lower line frequencies.

[dieseljeep]

Originally Posted by bandersen

I found a tall 50Hz transformer like that in a Canadian Admiral 19A11.

It was possibly a 25HZ. Canada had it quite awhile.
Someone on one of these forums had a CTC5, from Canada, that had a 25HZ power transformer. It was mounted on a separate chassis.
Proves that Canada used 25hz, that late. They also could have used 50hz, as well.
Some places in north America, also used 40hz, way back when.

[bandersen]

Ooops, yes you are correct - it was 25Hz

[wa2ise]

A 25Hz 125V transformer will run nicely at twice the line voltage (ie, 250V) on 60Hz, IF the insulation on any high voltage secondary is good enough to take the double voltage. Also a 6.3V heater winding will now produce 12.6V.

The higher the line frequency, the smaller the core needs to be for the same amount of power to be transferred. That's the big selling point of switching power supplies. Airplanes used to use 400Hz so they could use smaller and lighter transformers. You may have seen these in surplus equipment. But a 400Hz 120V transformer will only accept 6/40 times 120V=18V@60Hz.