05-27-2016, 08:52 AM
Check post 8 !
The filament wanders back and forth that's why I drew it out so I could follow it with out getting ein Kopfschmerzen . My Russian is pretty good ! Yes the dc for the filament is derived from the B+ though a divider, 1800 ohms in series and 680 ohms in parallel with the voltage. This drops the 120vdc or so down to 9vdc. A 200mf (sorry don't know how many nf that is) is used to decouple the 9v from the hv.There are 6 1.5v tubes connected in series to equal 9v. String starts at the 680 ohm resistor and ends at the osc coil as the - return (a little odd).
Kirk! Do not get me any of these to restore.
Between Sam and I we have 3 of them!!!!
Terry
The filament wanders back and forth that's why I drew it out so I could follow it with out getting ein Kopfschmerzen . My Russian is pretty good ! Yes the dc for the filament is derived from the B+ though a divider, 1800 ohms in series and 680 ohms in parallel with the voltage. This drops the 120vdc or so down to 9vdc. A 200mf (sorry don't know how many nf that is) is used to decouple the 9v from the hv.There are 6 1.5v tubes connected in series to equal 9v. String starts at the 680 ohm resistor and ends at the osc coil as the - return (a little odd).
Kirk! Do not get me any of these to restore.
Between Sam and I we have 3 of them!!!!
Terry
