[OldTechFan96]

Hello DoubleWound, I missed your post. The chassis looks a bit rough. It looks to have had a replacement 8uf smoothing capacitor, just like mine. Good luck!

Part designations refer to the Trader Sheet 236.

Power Supply and Voltage Testing

These tests have been done with a lamp limiter and a RCD. Safety goggles on!
All transformer (mains and audio) windings ohm out correctly.

No HT shorts.
Electrolytic capacitors tested with Hunts CRB3 tester.
C22 (original, 8uf) leaky at 20v-100v.
C22 (Plessey replacement, 10uf) leaky at 200v-300v.
C23 (32uf) leaky at 100v-200v.

V5 anode to anode (no rectifier): 700VAC
V5 each anode (rectifier installed): 310VAC
Rectifier heater: 3.8VAC
Lamp and heater winding: 4.5VAC

The power supply was tested with its original smoothing capacitors but they acted more like resistors lowering the HT to 60v. Replacing C22 with its Plessey replacement helped things a bit as it reformed. I noticed it getting hot so it was removed. C23 seemed to reform somewhat. Later I noticed that it was leaking electrolyte and getting hot.

Modern replacements have been temporarily clipped in for testing.

Both smoothed and unsmoothed HT measures about 360v with limiting on. It rises to over 400v with direct mains. I was concerned about too high HT but I assume that this will come down when all the valves are fitted.

Is C17 the grid coupling capacitor for this radio? I have never seen one before the volume control.

Here are some photos of the radio while it is under test.