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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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2nd Sep 2018, 1:43 pm | #1 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Valve identity
I have 2 valves but unsure what their numbers are? Anyone help, think the first one is a mullard EBH something or other , the 2nd one poss brimar.
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2nd Sep 2018, 1:48 pm | #2 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
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Re: Valve identity
EABC80 for #1 photo, the B9A valve. Almost certain unless its a UABC80
EB91 for the B7G? |
2nd Sep 2018, 1:50 pm | #3 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve identity
6BH6?
Lawrence. |
2nd Sep 2018, 1:59 pm | #4 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,567
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Re: Valve identity
The second is definitely not an EB91. I was also thinking 6BH6. If there are no markings on the first one at all it will be (as already stated) an EABC80 or a UABC80 triple diode triode for AM/FM receivers.
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2nd Sep 2018, 2:09 pm | #5 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve identity
If intact, a cold resistance measurement of the heaters should give a clue which *ABC80 it is in the absence of a power supply.
Lawrence. |
2nd Sep 2018, 2:40 pm | #6 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
Will have a check on resistance later on lawrence
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2nd Sep 2018, 3:30 pm | #7 |
Hexode
Join Date: May 2005
Location: Wigan, Greater Manchester, UK.
Posts: 479
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Re: Valve identity
Don't forget HABC80 and PABC80, rare, but possible.
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2nd Sep 2018, 5:00 pm | #8 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
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Re: Valve identity
True, I've never seen either! A basic check with 6v across the heater will possibly rule out 2 or 3 of the alternatives.
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2nd Sep 2018, 11:20 pm | #9 |
Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,219
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Re: Valve identity
That Mullard one should have a Philips code on it somewhere - some letters and numbers near the base in (almost) indelible ink. If you can read them and post the result here, somebody should be able to decode the type number.
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3rd Sep 2018, 9:18 pm | #10 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
No base numbers on either.
The mullard one is showing a resistance of 10.88ohm at pins 3-4 Not sure which pins in suppose to be looking for resistance on |
3rd Sep 2018, 9:39 pm | #11 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Valve identity
Valve heaters are usually pins 3 and 4 on a 7-pin base (except battery valves, which use 1 and 7) and 4 and 5 on a 9-pin base.
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3rd Sep 2018, 9:55 pm | #12 |
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Location: Solihull, West Midlands, UK.
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Re: Valve identity
11 ohms cold resistance sounds plausible for a 6.3V 0.15A heater like 6BH6.
There are other triple-diode-triodes, some of which are near equivalents of *BC80 (such as 6T8). Some have a grey anode for the triode section; some do not. It probably varied from one manufacturer to another. Brimar factory codes can be difficult to spot; smaller than Philips and sometimes vertical. Unfortunately my list of them has not yet made its way onto my new website but it will be one of the first pages to appear. |
3rd Sep 2018, 10:19 pm | #13 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
There is a number stamped on the side which i can now see 46L
The smaller valve i would agree 6bh6, the other one all that is on it is the 46L |
4th Sep 2018, 10:19 pm | #14 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
So any clues from the 46L ?
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6th Sep 2018, 2:02 pm | #15 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: Valve identity
Something resembling 46L, likely right triangle 6L, is probably the second line of text and thus the factory identifier and date code. Can you find any text above it?
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6th Sep 2018, 9:56 pm | #16 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
Picture of valve close up.
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7th Sep 2018, 11:15 am | #17 |
Rest in Peace
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
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Re: Valve identity
Can I see the bottom half of a D? Codes I have for *ABC80 are:
Y4, m4 EABC80 mA, rD PABC80 d8, mT, rE UABC80 In each case these would be followed by a digit giving the version, often in the range 1-3. So rD0 or rD3 are possibilities, with the r now missing. The triangle means made at Heerlen, Netherlands. |
8th Sep 2018, 12:37 pm | #18 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
I would say more D0
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8th Sep 2018, 2:26 pm | #19 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve identity
If the heater's intact the resistance between pin 4 and pin 5 should help to identify which type it is in the absence of a power supply.
Lawrence. |
8th Sep 2018, 6:15 pm | #20 |
Heptode
Join Date: Jan 2016
Location: Gateshead, Tyne and Wear, UK.
Posts: 504
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Re: Valve identity
Will check the pins later on
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