UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

OldTechFan96 · 18th Jun 2021, 3:57 pm

I've buzzed out the mains transformer, audio output transformer and the three windings associated with the speaker. Everything measures as it should.

The transformers were correctly reconnected. I've double-checked old photographs.

I next checked the resistance between the positive end on each smoothing capacitor to the chassis.

C22: 1K ohm
C23: 6 ohm

These measurements are similar to what was measured across the speaker coils. I'm confused. The speaker is also connected correctly.

The voltage measured on the HT tag of the speaker is 210V. I think it should be 260V.

Does anybody know what is going on?

18th Jun 2021, 3:57 pm	#45
OldTechFan96 Octode Join Date: Jul 2017 Location: Newcastle Upon Tyne, Tyne & Wear, UK. Posts: 1,186	Re: Ultra Model 50 (1937) Restoration I've buzzed out the mains transformer, audio output transformer and the three windings associated with the speaker. Everything measures as it should. The transformers were correctly reconnected. I've double-checked old photographs. I next checked the resistance between the positive end on each smoothing capacitor to the chassis. C22: 1K ohm C23: 6 ohm These measurements are similar to what was measured across the speaker coils. I'm confused. The speaker is also connected correctly. The voltage measured on the HT tag of the speaker is 210V. I think it should be 260V. Does anybody know what is going on?