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Old 22nd Jul 2021, 8:18 pm   #1
radionovice
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Default Unknown Mullard Valve. Identified as a 367 Tungar Rectifier.

Hi all
Picked this up at a boot sale the other day.
Its a bit of a monster (I think) and wondered if anyone could identify it as can't make out the model number on the box (if its even the original box?
Its circa 17cm tall
Thanks in advance
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Old 22nd Jul 2021, 8:48 pm   #2
Cobaltblue
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Default Re: Unknown Mullard Valve

Looks like a Tungar rectifier.

http://www.r-type.org/exhib/aby0014.htm

See this thread

https://www.vintage-radio.net/forum/...ad.php?t=80248

Cheers

Mike T
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Old 22nd Jul 2021, 10:03 pm   #3
radionovice
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Default Re: Unknown Mullard Valve

Quote:
Originally Posted by Cobaltblue View Post
Looks like a Tungar rectifier.

http://www.r-type.org/exhib/aby0014.htm

See this thread

https://www.vintage-radio.net/forum/...ad.php?t=80248

Cheers

Mike T

Nice one thanks Mike
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Old 23rd Jul 2021, 9:38 pm   #4
G6Tanuki
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Default Re: Unknown Mullard Valve

I was always fascinated by Tungars; until copper-oxide and selenium-rectifiers came along they were the only real option for low-voltage-high-current rectification.

Their big problem was that they dropped something like 15 Volts in the 'forward' direction - meaning lots of power dissipated as heat! The old accumulator-charging-shops would series-connect accumulators so their combined voltages were high - and so the 15V dropped across the Tungar was a less-significant wastage.
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Old 24th Jul 2021, 1:29 am   #5
kalee20
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Default Re: Unknown Mullard Valve. Identified as a 367 Tungar Rectifier.

Well, there was also the vibrating reed - and electrolytic rectifiers...
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Old 24th Jul 2021, 9:10 am   #6
lesmw0sec
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Default Re: Unknown Mullard Valve. Identified as a 367 Tungar Rectifier.

I'd add to that with the synchronous disk rectifier. Shown here is the one used in the cordite factory at Holton Heath, which produced high-voltage DC for the Cottrell (fume dust extraction) plant.
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