Raytheon Porthole on the 'Bay - Videokarma.org TV - Video

***Eric H*** · #1 01-23-2009, 03:06 AM

Nice sets, I think the hole on the left shouldn't be there though.

I rebuilt one of these last year for someone and they are an interesting set, it doesn't use a Flyback transformer, instead it has an oscillator type HV system like the electrostatics, it also has a very strange slug type tuner with a weird linkage system.

http://cgi.ebay.com/ANTIQUE-Raytheon...3A1|240%3A1318

David Roper · #2 01-23-2009, 10:16 AM

The oscillator HV is unusual but it gets more bizarre. In one of the pics you can see a 50B5 tube so marked on the chassis. There are actually three of them lined up in a row at that spot and behind them is a rectifier. The 50B5s are connected in parallel as horizontal output! The tube behind them is the damper--a 35Z5GT. Craziness. I love it.

Hemingray · #3 01-23-2009, 11:04 AM

Looking at the tube layout in one of the pics, it appears there are TWO 35Z5s in this set.

David Roper · #4 01-23-2009, 09:48 PM

Right you are, immediately to the left of the damper is a second 35Z5 which provides the B+ boost.

Hemingray · #5 01-24-2009, 10:55 AM

An attempt at using more common radio tubes to ease replacement maybe?