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 Collecting mini TVs
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 Return to top of page · Post #: 1 · Written at 3:17:02 AM on 28 October 2023.
NewVista's avatar
 NewVista
 Location: Silver City WI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 977

My collection: set at back-right is Sony Watchman that has flat CRT, its circuit includes a power "Keystone" Op-amp that modulates the B+ to the Hor-O/P Xsistor. The set at back-left has 3.75" Indextron single-gun Chromatron-type picture tube!

Small televisions
 
 Return to top of page · Post #: 2 · Written at 9:19:49 PM on 29 October 2023.
Brad's avatar
 Brad
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7395

Photo uploaded.


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

 
 Return to top of page · Post #: 3 · Written at 3:36:11 AM on 10 November 2023.
NewVista's avatar
 NewVista
 Location: Silver City WI, US
 Member since 10 May 2013
 Member #: 1340
 Postcount: 977

Because the Watchman's flat crt requires modulated Horiz-sweep, they have the Hor-O/P driving the yoke directly, and duplicate the power horiz circuit with an off-the-shelf mini flyback X'former to obtain HV and some other voltages/pulses!

The 3.75" Sony Indextron was the ultimate iteration of the Index Beam CRT having a tortured history going back to the early 50's!

https://en.wikipedia.org/wiki/Beam-index_tube

If you can find a limited production Sony mini-Chromatron, you could afford to move to Bondi or Burleigh with ocean view!
 
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