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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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22nd Jul 2021, 8:18 pm | #1 |
Diode
Join Date: Oct 2019
Location: Norwich, Norfolk, UK.
Posts: 3
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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 |
22nd Jul 2021, 8:48 pm | #2 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,823
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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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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
22nd Jul 2021, 10:03 pm | #3 | |
Diode
Join Date: Oct 2019
Location: Norwich, Norfolk, UK.
Posts: 3
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Re: Unknown Mullard Valve
Quote:
Nice one thanks Mike |
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23rd Jul 2021, 9:38 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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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. |
24th Jul 2021, 1:29 am | #5 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,060
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Re: Unknown Mullard Valve. Identified as a 367 Tungar Rectifier.
Well, there was also the vibrating reed - and electrolytic rectifiers...
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24th Jul 2021, 9:10 am | #6 |
Octode
Join Date: Jul 2009
Location: Carmel, Llannerchymedd, Anglesey, UK.
Posts: 1,498
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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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