Under the hood, Indextron

[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 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]

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.