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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: Circuit Symbol
Date: Wed, 18 Dec 2024 11:25:27 -0800
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On Wed, 18 Dec 2024 19:00:01 +0000, Cursitor Doom <cd@notformail.com>
wrote:

>On Wed, 18 Dec 2024 10:57:10 -0800, john larkin <jl@glen--canyon.com>
>wrote:
>
>>On Wed, 18 Dec 2024 18:38:55 +0000, Cursitor Doom <cd@notformail.com>
>>wrote:
>>
>>>Gentlemen,
>>>
>>>A chum of mine who's into classic cars has asked me to take a look at
>>>the radio out of his 1938 Bentley which has never worked in all the
>>>years he's had it in his ownership. Obviously, given the year, this is
>>>an all-valve job (if you're in the US, I'm referring to what YOU call
>>>"tubes"). There isn't a single semiconductor in this thing cos they
>>>weren't invented until much later. The valves require an anode
>>>("plate" if you're in the US) voltage of 235V so there's a DC to DC
>>>up-converter to generate that from the 12V battery. Rather interesting
>>>approach they've used and one can see an embryonic SMPS in there!
>>>Anyway, there's a schematic symbol I can't identify for sure. Could be
>>>a fuse, could be a link or jumper, could be a current test point, I've
>>>no idea. So can some kind, intelligent soul enlighten me? They're
>>>labeled V1 through V8. Here's a pic:
>>>
>>>https://disk.yandex.com/i/mIv_txLia6Xx4Q
>>>
>>>TIA,
>>>CD
>>
>>Probably the tube filaments.
>>
>>Incidentally, I have seen people selling solid-state plugin
>>replacements for vibrators.
>
>Splendid suggestion, John. I must admit that never occurred to me.
>I'm afraid this chap is a stickler for originality and wants
>everything done with old parts. I did venture to suggest a modern,
>monolithic converter but that was rebuffed most vociferously. Sigh...

I'd stick a transistor radio behind the old knobs.

It may have a dynamic speaker too, which could be hard to replace.

Buy the vibrator replacement and rub some dirt on it, or stuff it into
the ugly old can.