UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Series connected stabilizer valves: questions

Skywave · 15th Mar 2019, 1:07 am

I have three 'known-good' 0B2 stabilizer valves. The 0B2 has a stab. voltage of 85 v. ± 1v. depending on its current and a striking voltage of about 130 v.
The idea is to connect three 0B2 valves in series to produce a stabilized voltage of 255 v. (255 = 85 x 3) from a 350 v. input voltage.

I used 220 kΩ resistors from the 350 v. to the two 'lower' valves to meet the striking voltage requirement and a 4k7 Ω resistor from the 350 v. to the first 0B2. Yet configured as a '255 v. stabilizer', the current drawn from the 350 v. supply is far less than my calculations predicted

- so as a '255 v. stabilizer', it doesn't work. The wiring is correct; my arithmetic makes sense - so what part/s of all this do I have wrong or do not understand?

All replies will be appreciated.

Al.

15th Mar 2019, 1:07 am	#1
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Series connected stabilizer valves: questions I have three 'known-good' 0B2 stabilizer valves. The 0B2 has a stab. voltage of 85 v. ± 1v. depending on its current and a striking voltage of about 130 v. The idea is to connect three 0B2 valves in series to produce a stabilized voltage of 255 v. (255 = 85 x 3) from a 350 v. input voltage. I used 220 kΩ resistors from the 350 v. to the two 'lower' valves to meet the striking voltage requirement and a 4k7 Ω resistor from the 350 v. to the first 0B2. Yet configured as a '255 v. stabilizer', the current drawn from the 350 v. supply is far less than my calculations predicted - so as a '255 v. stabilizer', it doesn't work. The wiring is correct; my arithmetic makes sense - so what part/s of all this do I have wrong or do not understand? All replies will be appreciated. Al.