31-07-2015, 02:34 PM
(30-07-2015, 09:37 PM)Brianc Wrote: I know what the radio looks like as there is a picture in an earlier thread. I would like to see the workings of it and the repairs/replacements that you have made.
Cheers
Brian
A large chunk of this thread was on another vintage radio website as somebody else remarked a few posts back. That particular thread contained quite a few digital photos. The thread was eventually closed down by the moderators on that other site at the point where I'd plugged into mains but was getting no audio. At that time, I was sort of baffled because the rectifier was working but no sound at all. Later I discovered I needed to replace my valves I resurrected the thread here in case anyone might happen to have any of the valves I was seeking.
I avoided keeping it on for two long yesterday as I suspect the voltage will be a bit low. What I have to do is to test the Output Tetrode anode again and see what the voltage is compared to the manual. If it's still too low, I'll need to lower my series resistor. The aim is to hopefully get the anode voltages about the same as outlined in the schematic. I will also look into the HT capacitor as it seems to me charge isn't being retained. I have a German set that you daren't touch even 3 hours switched off after powering it up so I ought to investigate.
I may even consider using a valve rectifier and removing my silicon experimental set-up but that depends if I'm lucky enough to get a matching rectifier.
I think it may also be a good idea to fit an inline quick blow fuse in the supply line and secure any wires that could be in danger of working loose.
The next project may be the large HMV stored in my boat. This will be a really big challenge as soldering will be much trickier and one of the waveband screens has been totally wiped clean, leaving no letters. Plus the tuning string has broken. All valves are present
Either that or I could tackle a McMichael set in the garage that has all its valves.







