Acquired a 1950 Philco 50-701

[dieseljeep]

Originally Posted by decojoe67

I finally popped for one of these classic compact 7" sets that started with the Motorola VT-71 in late '47. I believe these were the last of them. They came in brown and black bakelite. This one is black. What you see is about 10 hours of cosmetic work. Next is having my friend restore the chassis. The HV picture fade will be addressed. These are very hard to find in any condition. There is also a wood version that's a bit plainer, but also a classic. These are nice quality in and out.

It's a well-known fact that the HV fade is caused by the air-core HV coil.
Someone out there was making a solid state substitute for the transformer that just plugs into the 6V6 HV OSC socket.

[decojoe67]

Originally Posted by dieseljeep

It's a well-known fact that the HV fade is caused by the air-core HV coil.
Someone out there was making a solid state substitute for the transformer that just plugs into the 6V6 HV OSC socket.

I would get one of them if I could find one. My repairman is pretty determined to make this one play well. He says he's got plan A, then B, then C....
I believe a muffin fan will do the trick. I did it with my Hallicrafters 505 and it virtually eliminated the fade problem. Why not have the chassis run cool anyway?! It'll be interesting to see how this one will play. It'll soon be on the bench.

[jr_tech]

Originally Posted by dieseljeep

It's a well-known fact that the HV fade is caused by the air-core HV coil.
Someone out there was making a solid state substitute for the transformer that just plugs into the 6V6 HV OSC socket.

Like this?

http://www.myvintagetv.com/philco_hv.htm

jr