Early Admiral on Kijiji Toronto

[Robb]

http://ontario.kijiji.ca/c-buy-and-s...AdIdZ524161984

$450


TV - Antique (Vintage) - Vintage Retro or Mid Century Modern 1940's Admiral Bakelite TV; An original black and white floor model television; made by Canadian Admiral Corporation Ltd., Malton, Ontario. Dimensions are:16 in. wide, 32 in. tall, 18 in. deep; Model No. 24A12X; it is a 25 cycle television, but works on 60 cycle 117 volt AC; The front has a Horizontal/Vertical Adjstment Knob, a Contrast/Brightness knob, a Off/Volume/Focus knob, and a Channel/Sharp tuning settings Knob (this is the missing knob). The back has Vertical Line, Height, Horizontal Lock, Horizontal , Horizonatal Line and Horizontal Width settings. It has an original label intact.; No. 132400 CSA AFP No. 9720. It turns on, tubes light up; IT WORKS; Please call or text 905-687-2875.

[bandersen]

I love the huge 25Hz transformer Here's the 60Hz version.

[Tom Albrecht]

Wow, that would make the 25 Hz version another 15 lbs heavier!

[Jon A.]

I had never heard of 25-cycle power. I don't think even a restored one of these would go for that much. That transformer is something else though. Imagine dropping that on your foot.

[6GH8cowboy]

Fishing expedition.

[Kamakiri]

All of Canada had 25 cycle power, as opposed to 60 cycle, until the mid-60s or so IIRC. I had a CTC-5 with an outboard transformer setup that was made to handle 25 cycle power....it was bought in the US and transported over.

You can use 25 cycle stuff on 60 cycle current, but not the other way around.

[electroking]

Originally Posted by Kamakiri

All of Canada had 25 cycle power, as opposed to 60 cycle, until the mid-60s or so IIRC. I had a CTC-5 with an outboard transformer setup that was made to handle 25 cycle power....it was bought in the US and transported over.

You can use 25 cycle stuff on 60 cycle current, but not the other way around.

Definitely not all of Canada had 25 Hz in 1960. Some regions did have
it until the mid sixties as you say, but I believe for instance that Montreal
never had anything other than 60 Hz once AC power became available.
I do have a Motorola clock radio (with AA5 electronics) designed for
25 Hz. Have been thinking of building a 60-to-25 Hz converter just to
run that radio, but it remains a project.

[Kamakiri]

You don't have to build a converter. Just plug it in. Being in Buffalo, we get quite a few radios from Canada that come this way that have 25 hz transformers.

[dieseljeep]

Originally Posted by Kamakiri

You don't have to build a converter. Just plug it in. Being in Buffalo, we get quite a few radios from Canada that come this way that have 25 hz transformers.

The radio has double filtering for 25 HZ. It's a regular AC/DC type AA5 with an electric clock.
The rotor will have to be replaced in the clock, as it will run really fast.

[Robb]

Because the TV is 25hz, will it consume more power or less ?

[electroking]

Originally Posted by Robb

Because the TV is 25hz, will it consume more power or less ?

Maybe a tiny bit more due to the losses in extra filter capacitors, but
should probably be insignificant.

Regarding my earlier post, there is the obvious problem with the
clock. Some people have told me that a 25 Hz clock powered at
60 Hz will run really fast, others that it will not run at all. Of course
the clock may not be in working order in the first place.

[dieseljeep]

Originally Posted by electroking

Maybe a tiny bit more due to the losses in extra filter capacitors, but
should probably be insignificant.

Regarding my earlier post, there is the obvious problem with the
clock. Some people have told me that a 25 Hz clock powered at
60 Hz will run really fast, others that it will not run at all. Of course
the clock may not be in working order in the first place.

AC operated clock motors are a synchronous design and are frequency sensitive. That's the reason, that electric clocks are so accurate.
Telechron built clocks for 25,40,50 and 60hz. The rotors had all different gear ratios.

[Jon A.]

Originally Posted by dieseljeep

AC operated clock motors are a synchronous design and are frequency sensitive. That's the reason, that electric clocks are so accurate.
Telechron built clocks for 25,40,50 and 60hz. The rotors had all different gear ratios.

Got to get a rotor for my Telechron oddity. Never knew those depended on the pulse of the AC line.

Originally Posted by Eric H

Can you imagine the Flicker of light bulbs at 25 Hz?

No, but I would like to see it.

[Eric H]

Can you imagine the Flicker of light bulbs at 25 Hz?

[wa2ise]

Originally Posted by Eric H

Can you imagine the Flicker of light bulbs at 25 Hz?

I've seen it. Back in the early 60's, parts of the New York City subway system used 25Hz. Their light bulbs lighting the stations did flicker. An oddity of the human eye is that the brighter the light source is, the higher the frequency you need to avoid the perception of flicker goes up. The rest of the station didn't seem to flicker as much as the bare bulbs themselves did. As the rest of the station hits your retina as a lower bightness level. Also 3 phases of electric supply would also smooth things out.

You also see this effect on 50Hz TV displays (PAL) vs 60Hz (NTSC) at higher brightness settings on CRTs.

A power transformer designed for 120V@25Hz in theory will be happy at 240V@60Hz. All the secondary voltages will be twice the rated voltages. One limitation is how good the insulation is on the secondary used to make B+.