Dumont RA-103 With Additional Tube Under Chassis?

[Eric H]

Originally Posted by old_coot88

Wasn't there some application in which 6AL5 was run at reduced heater voltage? I can't remember if it was as a detector or a relay driver for B+ delay.

I think that's in some of the 630 based RCA chassis, I know I've run into it but can't recall exactly where.

[jr_tech]

Originally Posted by old_coot88

Wasn't there some application in which 6AL5 was run at reduced heater voltage? I can't remember if it was as a detector or a relay driver for B+ delay.

Same set, right next to the 5U4, heater is operated through about a 5 ohm resistor (for time delay) to trigger a b+ relay.

jr

v-25 here:

http://www.earlytelevision.org/pdf/d...03d-sams93.pdf

[Polaraligned]

Originally Posted by Electronic M

Tube is topside on my Dumont doghouse and Stromberg Carlson TV-10, no 6X4s on either set. That 6AL5 is smack dab below the CRT so it is possible it was in the way of some CRTs (or not removable with the CRT installed) and Dumont's solution was to move it under chassis.

I can't imagine that tube being much easier to replace topside with the chassis in the cabinet.

Well, that makes sense.
I'll bet you have an early serial also.

Does anyone know if there is any serial number information available on Dumont sets?