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OldTechFan96 · 17th Mar 2018, 4:18 pm

R33: 220Ω, 1/2W, 5% tolerance. Its actual resistance is 240Ω which is a 9% increase. I will replace it as soon as I can.

The voltage across R33 was initially 9.7V and it started to climb to 11.5V. The cut out button popped up on my Avometer so I switched the radio off.

To estimate the current through the valve I used 10V as the voltage.

Current through the valve: 0.042A.

EDIT: I forgot to mention that these measurements were taken with HT reconnected.

17th Mar 2018, 4:18 pm	#55
OldTechFan96 Octode Join Date: Jul 2017 Location: Newcastle Upon Tyne, Tyne & Wear, UK. Posts: 1,187	Re: Bush VHF 81 Restoration R33: 220Ω, 1/2W, 5% tolerance. Its actual resistance is 240Ω which is a 9% increase. I will replace it as soon as I can. The voltage across R33 was initially 9.7V and it started to climb to 11.5V. The cut out button popped up on my Avometer so I switched the radio off. To estimate the current through the valve I used 10V as the voltage. Current through the valve: 0.042A. EDIT: I forgot to mention that these measurements were taken with HT reconnected. Last edited by OldTechFan96; 17th Mar 2018 at 4:41 pm. Reason: Extra Info