Under the hood, Indextron

[etype2]

We recently acquired a second Sony FD-62 for the purposes of tear down. Since the set is fully operational, we only removed the cover and prepared this video.

https://videopress.com/v/nbithNhE

Edit:#Correction to my narrative. #Introduction year was 1985, not 1987.

[Popester]

Marshall, that HV block and flyback have no dust from use. Is that how it came? Usually they would have dust on them and the HV wire would normally also grimey looking. Nice find. You have all the neat toys lol. Sony HV blocks are always in red epoxy. Even my old KV 9000U HV block is red.

[etype2]

That is how it looked on opening the cabinet, but I did clean the red block a bit. Some grime is still visible. Did not touch the HV wires. There is a dust layer throughout the chassis.

I did not know what to call the block, so I said “device” in my narrative. :-) LOL.

[etype2]

I wonder what the HV is on this CRT?

[JohnCT]

Originally Posted by etype2

I wonder what the HV is on this CRT?

I don't see any particular issues with the indexing tube design when it comes to HV, so my best guess is that it would be similar to any other three CRT projector of the same era: about 32KV.

Indeed, it might even be able to handle more than that. By the end of the CRT projector era, we were seeing almost 35KV on high end units.

John

[Popester]

Marshall, most all Sony OEM schematics for CRT televisions refer to this as a high voltage block assy or HV block assy. When I call that a tripler, that would be a more appropriate nomenclature if it was a Zenith. When I buy a tv on eBay I always use a handkerchief damp with water and wrung out and put a drop of dawn dishwashing liquid to clean off the grime that builds up. That HV lead to the picture tube won't bite you if you just clean it with a dampened cloth. As that lead is well insulated. Just make sure it's not plugged in. It does a great job of cleaning. The indextron for its time has a decent image on it.

[etype2]

Originally Posted by JohnCT

I don't see any particular issues with the indexing tube design when it comes to HV, so my best guess is that it would be similar to any other three CRT projector of the same era: about 32KV.

Indeed, it might even be able to handle more than that. By the end of the CRT projector era, we were seeing almost 35KV on high end units.

John

Thanks. Just to be clear, this projector is a one tube design, 5.25 inch diagonal measurement.

[etype2]

Originally Posted by Popester

Marshall, most all Sony OEM schematics for CRT televisions refer to this as a high voltage block assy or HV block assy. When I call that a tripler, that would be a more appropriate nomenclature if it was a Zenith. When I buy a tv on eBay I always use a handkerchief damp with water and wrung out and put a drop of dawn dishwashing liquid to clean off the grime that builds up. That HV lead to the picture tube won't bite you if you just clean it with a dampened cloth. As that lead is well insulated. Just make sure it's not plugged in. It does a great job of cleaning. The indextron for its time has a decent image on it.

Thanks for the tip. “ The indextron for its time has a decent image on it.”. I think so. We had a three tube Advent 750 and later a three tube Kloss Nova Beam. This projector compares favorably with only one tube.

[etype2]

I dug out my IDX 5000 service manual which uses the same CRT as the FP 62. Nominal operating voltage is 30.7 to 31.3 KV. JohnCT is correct.