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 Auction of old TV's ... in USA
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 Return to top of page · Post #: 1 · Written at 9:17:56 AM on 29 August 2020.
Tinkera123's Gravatar
 Location: Melbourne, VIC
 Member since 5 October 2009
 Member #: 555
 Postcount: 411

Some might be interested in this Auction ..... if not only to look at the photos ..... Smile
In USA.

https://www.mclarenauction.com/television


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Cheers, Ian

 
 Return to top of page · Post #: 2 · Written at 10:25:14 PM on 2 September 2020.
Oldtvmelb's Gravatar
 Location: Lakes Entrance, VIC
 Member since 28 July 2013
 Member #: 1384
 Postcount: 26

Great pics..love to see these


 
 Return to top of page · Post #: 3 · Written at 10:44:17 AM on 3 September 2020.
Irext's avatar
 Location: Werribee South, VIC
 Member since 30 September 2016
 Member #: 1981
 Postcount: 400

In USA they are spoiled for choice.


 
 Return to top of page · Post #: 4 · Written at 9:35:16 PM on 4 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

The last TV in the slide show, the small tabletop Motorola from the late-40's, featured a 7" oscilloscope-type tube (with electrostatic deflection) but with a white phosphor suitable for monochrome television. These small lightweight gems make a perfect little collectable (remember "small is good" when it comes to collectables!)

Having no heavy power tranny or yoke, these Motorola's weigh just 9.07kg (lighter than many mantle radios of the time!) A number of competitors also made these type 7" sets like Admiral & Sentinel...I just compared the weights of my Admiral & Motorola: the Admiral weighs 13.61kg as it has a power tranny Sad


 
 Return to top of page · Post #: 5 · Written at 2:51:25 PM on 6 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

Was just helping a friend with one of these 7" Admirals - stubborn 7kV problems. So I bought mine down to fix and compare: Was shocked to see mine had twice as massive power tranny, turns out it is for 25cps power in mid-century Canada!

Admiral Television Chassis
Admiral Television Chassis


 
 Return to top of page · Post #: 6 · Written at 10:46:55 PM on 6 September 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6349

Photos uploaded to Post 5.


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A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 7 · Written at 2:01:36 PM on 7 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

It's a big tranny for a small TV, have never seen a 25-cycle appliance before.


 
 Return to top of page · Post #: 8 · Written at 4:42:31 PM on 7 September 2020.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1905

Yes I guess when you are flinging the magnetism around so slowly you need a lot of iron to store the energy.


 
 Return to top of page · Post #: 9 · Written at 10:30:11 PM on 7 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

Looking it up, we find 25-cycle power was available in Ontario & upstate New York because Westinghouse generators in Niagara were spinning at a leisurely 250 rpm. Must have smoked a lot of appliances!


 
 Return to top of page · Post #: 10 · Written at 9:39:49 AM on 8 September 2020.
BurntOutElectronics's Gravatar
 Location: Melbourne, VIC
 Member since 2 October 2019
 Member #: 2392
 Postcount: 154

I have seen a YouTube video on the 25Hz model by bandersontv


 
 Return to top of page · Post #: 11 · Written at 3:28:44 AM on 12 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

The equivalent Motorola TV using the 7" oscilloscope type 7JP4 crt (with P4 phosphor) has almost identical circuit! I wonder who copied whom? The Motorola being a study in minimalism with the cheapest tuner ever: simply 3 ganged wafer switches under the chassis with no enclosed shielding, only shield on RF amp (6AG5) but not Mixer/Osc. (12AT7), pic. shows under-chassis tuner at left.

Motorola Turntable


 
 Return to top of page · Post #: 12 · Written at 8:39:18 PM on 14 September 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6349

Photo uploaded to Post 11.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 13 · Written at 2:02:45 PM on 15 September 2020.
NewVista's avatar
 Location: MilwWI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 745

A lightweight transformerless design.
I like how they say on the sticker "do not connect chassis to ground/water pipe". Yeah, if power is plugged-in the 'wrong way' around (a 50/50 chance) then Boom!


 
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