Admiral find

[Tony F]

I picked up another 1949 Admiral set. This one has a 12LP4 that tests ok. It is a 24C12X 25 Hz set. My first wood version. Cabinet is in decent condition. Also the first one that has a back cover.

[nasadowsk]

25hz! Look at the size of the power transformer!

As an aside, Amtrak in the US is still 25Hz power on the Northeast Corridor, with the requisite large transformers and weight penalty for trains...

[MadMan]

25 Hz?!

Weird. What would happen if you used 60Hz? Like... the transformer would still work, right? I don't even.

[kvflyer]

Originally Posted by MadMan

25 Hz?!

Weird. What would happen if you used 60Hz? Like... the transformer would still work, right? I don't even.

A 25 CPS transformer will work just fine on 60 CPS. But it is a problem going the other way.

[Electronic M]

Originally Posted by MadMan

25 Hz?!

Weird. What would happen if you used 60Hz? Like... the transformer would still work, right? I don't even.

It will run very cool, the filter caps will be rediculously oversized and there should be much less residual ripple on the B+ lines.

The first AC system run off Niagra falls was 25Hz (it was that way due to the dam originally being designed for pneumatic power, and there being no standard for AC yet) and it created many pockets of 25Hz in the northeast and Canada many of which lingered into the the 50's-70's, and in electric rail systems still opperate today...Because it was a standard it saw some extensive use in California and some other pockets in the southwest and elsewhere. If you buy enough 50's and earlier TVs and radios eventually you'll come across one.

[MadMan]

I see. I wasn't aware 25Hz was a thing into the 50s.

So would the rest of the tv components work ok?

[kvflyer]

Originally Posted by MadMan

I see. I wasn't aware 25Hz was a thing into the 50s.

So would the rest of the tv components work ok?

Yes, the rest of the components won't know what was supplying the power supply.

[dieseljeep]

Originally Posted by Electronic M

It will run very cool, the filter caps will be rediculously oversized and there should be much less residual ripple on the B+ lines.

The first AC system run off Niagra falls was 25Hz (it was that way due to the dam originally being designed for pneumatic power, and there being no standard for AC yet) and it created many pockets of 25Hz in the northeast and Canada many of which lingered into the the 50's-70's, and in electric rail systems still opperate today...Because it was a standard it saw some extensive use in California and some other pockets in the southwest and elsewhere. If you buy enough 50's and earlier TVs and radios eventually you'll come across one.

Actually, California was 50cy earlier in the last century. According to the Telechron clock website, the Telechron firm agreed to convert their clocks to 60cy at a minimal cost, when the frequency changed.

[nasadowsk]

I've seen radios rated for 40hz, but I've never heard of 40hzpower anywhere...

[wa2ise]

Originally Posted by kvflyer

A 25 CPS transformer will work just fine on 60 CPS. But it is a problem going the other way.

If the internal insulation is up to it, you could run the 120v 25Hz transformer at 240V at 50 or 60Hz. You'd get double the voltages on each secondary. The TV circuits would not like that though.