Hi Lloyd, The set I'm working on is a U20 model which I believe was made by McMichael. One part of the circuit which might invite comment is the detector stage. A Westector diode is employed which requires a forward bias in order it can work properly. This is obtained from the output valve's bias resistor.
Till Eulenspiegel.
Westector diode.
The set is much cleverer than just using a Westector - there's also stuff going on with the suppressor grid of the EF39.
Mine has arrived! Quite a weighty little thing, all looks in good order, bit of water damage to the case, but still feels solid. I really want to get stuck in, but I’m just soooo tired! Have been all week, so I might have to wait to see what’s inside it.
regards
Lloyd
The fabric on the loudspeaker baffle has a Murphy look about, there's a similar cloth on the A58V TV set. If it's a Murphy it will have U7 on the chassis. Reckon you've got a good set there.
Till Eulenspiegel.
Hi Lloyd, brightened your picture and now I'm sure it's a Murphy.
Till Eulenspiegel.
Murphy knobs, Murphy grille cloth, if we see a picture of the inside I'll wager the IFTs are Murphy too.
Indeed it is a Murphy, there’s a U7 stamped right next to the serial number. It also has a blue painted chassis too. I took the back off for the first time today, I was expecting it to have been messed about, due to the modern white 3 core mains lead, but it actually looks like it’s not been tinkered with beyond the mains lead, still a wax cap on the output TX, and it was full of cob webs! I gave it a quick vacuuming before putting the back on, it’s going to need a more powerful clean than the mini dyson can do, those cob webs are well stuck! There’s a bit of hard rubber wiring in there, so that’s going to need replacing.
Regards
Lloyd
I am distinctly unimpressed with how the mains earth has been terminated.
It does leave a little to be desired doesn't it! I will be removing the mains lead and replacing it with something nicer, I'll find somewhere else to terminate it, preferably with a solder tag!
Regards,
Lloyd
Not to forget the wartime utility radio receiver was designed by Dr. G. D. Reynolds of Murphy Radio Ltd.
I've ordered twenty maple wood strips, two will be used on the repro cabinet to create the detailing each side of the front panel.
The other eighteen? These will be used to make the slatted loudspeaker grill in the Decca 101 recreation project.
Till Eulenspiegel.
Nice wood to work with Maple, I've used quite a bit over the years.
Boater Sam
Nice wood to work with Maple, I've used quite a bit over the years.
It sure is. That's the tricky part of the job done, making the three grooves in the wood strips. The next stage make those rounded edges. Took no chances with this task, an extra fence to guide the wood strip through the saw bench.
Till Eulenspiegel.
Today, the wood trim strips were glued and clamped into position. Leave it for a few days to allow the PVA glue to set. It's still not very warm in the workshop.
Till Eulenspiegel.
The set was made by McMichael so the replica cabinet should be made as close as possible to resemble the original. To that end the fabric shown in the second attachment is as close as one can find to the original material used by the manufacturer. The set is the model 382, I think.
Till Eulenspiegel.
Looks more like a 380: the 382 is the huge motor-tuned set they built.
It is indeed a 380. I started a thread about the set on the UKVRRR at the end of last year. Its been put aside in order to concentrate on the Baird T5 restoration.
Till Eulenspiegel.
The loudspeaker baffle assembly was completed yesterday, but rest assured there is still a few more tasks to do before the cabinet construction can be signed off.
Till Eulenspiegel.
