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Old 28th Sep 2011, 9:04 pm   #4
david winter
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Join Date: May 2008
Location: Paris, France
Posts: 336
Default Re: 1940 Lorenz Textophon wire recorder

Some early news...:
I replaced the two big fat 4,5µF motor caps. You would never believe it by seeing the original cans.
After a first try the machine turned on. The wire spooled nicely (and FAST!) but the fuse blew again.
I removed both power supply and amplifier chassis. I was surprised to find that the power supply was recently restored. Not much there: the mains transformer, the choke, 4 electrolytics (already replaced), one EZ12 rectifier and one selenium rectifier (most probably to power the relays). I was amazed by the size of the two 700µF/35V capacitors. They may be used along with the selenium rectifier for the relays.
However the amplifier chassis was never restored, so *maybe* it caused the fuse to blow, but this remains unsure. There are a few standalone paper capacitors in metal cans in the cabinet, which I will test once I have restored this chassis.
Enough for today. Maybe something tomorrow but we'll see... Stay tuned !
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