I picked up two Sentinal 7" electrostatic sets from ebay. One a model 400 and the other a IU400. Both use 7JP4s. I've read all the horror stories about the electrostatic sets and am prepaired for the danger. So far I took the model 400 apart. I have never seen a set come apart so easy. There are two chassis; an audio/video chassis and the CRT chassis containing all the HV caps, the CRT, etc. This set seems to have a power transformer on the AV chassis. The power switch/volume control is on the same chassis and connected that way. It also has a stinky selenium rectifier in the AV chassis which are red. The CRT chassis has two blue stinky selenium rectifiers. Looks to me like the power transformer handles everything, as the power rating on the set is 175W and the power transformer looks big enough.
I plan on fully recapping it and replacing the selenium rectifiers, and getting some nice AST HV caps. This set definately looks like it had repair work done before. 3 out of 4 of the HV caps were changed. The AV chassis really doesn't have as much tubes as a 630TS chassis. How well do these sets work and how good is their picture? And does anyone else have any last minute advice?
Chuck,
From doing a search I saw that you have one. How do you like it?
Thanks.
Jonathan