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Old 22nd Dec 2004, 8:00 pm   #1
greg_simons
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Default ODD VALVE,type 'e80f'

hi folks and and a happy christmas everyone.
does anybody have any info on some strange valves
that i have found in the loft,they are mullard type 'e80f'
i can find no info and a search across the web has proved fruitless as well.
any help would be most welcome.

many thanks
greg.
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Old 22nd Dec 2004, 8:09 pm   #2
mickjjo
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Default Re: ODD VALVE

Well there is an E80CC if this is any help:-

http://www.r-type.org/exhib/aaa0426.htm

Regards, Mick.
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Old 22nd Dec 2004, 9:16 pm   #3
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Default Re: ODD VALVE

Does it look like it has two sections - maybe the second C got rubbed off.
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Old 22nd Dec 2004, 10:43 pm   #4
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Default Re: ODD VALVE

I have a hazy recollection (most of them are, these days, though, ) of an e80C as a " frame grid " half-ECC88. I think I may even have used it somewhere along the line.
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Old 23rd Dec 2004, 11:11 am   #5
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Default Re: ODD VALVE

Quote:
Does it look like it has two sections - maybe the second C got rubbed off.
...Or alternatively an F got rubbed off (E80CF) - a triode-pentode frequency changer.

Last edited by Paul Stenning; 29th Dec 2004 at 11:17 am.
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Old 23rd Dec 2004, 11:36 am   #6
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Default Re: ODD VALVE

I understood that there were several of these valves.

Difficult to believe they've all had their last letter rubbed off.
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Old 23rd Dec 2004, 1:00 pm   #7
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Default Re: ODD VALVE

Quote:
I understood that there were several of these valves.
Ah you spotted that! Any chance of a pic Greg? I'd be interested in one of these if they are going begging.
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Last edited by Paul Stenning; 29th Dec 2004 at 11:17 am.
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Old 23rd Dec 2004, 2:13 pm   #8
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Default Re: ODD VALVE

Greg,

Are you sure that the number is an '80'? There is an E86C and an E88C but I can find no reference to an E80C...
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Old 24th Dec 2004, 6:48 pm   #9
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Default Re: ODD VALVE

hi folks again
well!,that caused a stir.
at this point i have to hand my head in shame because
i got the suffix wrong, the valve type is 'e80f'.
all the same still no info on it and any help to identify
the things would be helpful,also i will alter the topic
header as well.
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Old 24th Dec 2004, 8:22 pm   #10
paulsherwin
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Default Re: ODD VALVE,type 'e80f'

Hi Greg, I believe the E80F is a special quality version of the EF80. I have a couple in my valve hoard but have never tried to do anything with them.

Happy CHristmas, Paul
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Old 26th Dec 2004, 1:11 pm   #11
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Talking Re: ODD VALVE,type 'e80f'

Hi everyone.

Paul Sherwin is right. It was a specially selected industrial version of the EF80. May have been used in industrial RF amps. If you have any you could probably use them in place of the ordinary EF80...it would have been considered a waste but it'll probably last forever in a domestic set.


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Old 26th Dec 2004, 5:07 pm   #12
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Exclamation Re: ODD VALVE,type 'e80f'

Good evening all,
you are totally wrong. Nothing to do with the EF80
It is an audio valve and the E80F has the same pinout like the
EF86!
The u g2 is 25 for the E80F and the u g2 for the EF86 is 38.

So if you use it as a pentode it may be a replacement for the
EF86.

Kind regards
Darius

PS the EF800 is the audio EF80 it has a bifilar heater.
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Old 29th Dec 2004, 10:30 am   #13
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Cool Re: ODD VALVE,type 'e80f'

many thanks all of you out there
I will certainly try the in place of the ef86 in my maplin special and see if they
work.
I was puzzled by the odd nomenclature as it does not seem to indicate
exactly what type of valve it is,any help in this direction would be useful.
many thanks again for all your answers to this query.
greg.
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Old 29th Dec 2004, 3:06 pm   #14
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Default Re: ODD VALVE,type 'e80f'

"I was puzzled by the odd nomenclature as it does not seem to indicate
exactly what type of valve it is,any help in this direction would be useful."

I know it does not appear to fit the usual Mullard coding, but it does - in special quality valves, the number and electrode-type letter were switched. I.E., ECC83 would become the E83CC.

I know it appears to go against the logic of the Mullard code!

Sam
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Old 29th Dec 2004, 9:48 pm   #15
paulsherwin
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Default Re: ODD VALVE,type 'e80f'

Quote:
Originally Posted by Darius
Good evening all,
you are totally wrong. Nothing to do with the EF80
It is an audio valve and the E80F has the same pinout like the
EF86!
The u g2 is 25 for the E80F and the u g2 for the EF86 is 38.

So if you use it as a pentode it may be a replacement for the
EF86.
That's interesting Darius, I didn't know that. Just as well I didn't try to use one in place of an EF80! Now, what would the audiophools pay for a special qualify EF86? Watch eBay in January folks...

Best regards, Paul
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Old 13th Jan 2005, 10:00 pm   #16
greg_simons
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Talking Re: ODD VALVE,type 'e80f'

hi folks again
the e80f valve works just fine in the maplin special but i'm unable to detect
much audible difference!!, still sounds great.
many thanks for all your replies to this thread.
greg.
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Old 14th Jan 2005, 1:07 pm   #17
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Default Re: ODD VALVE,type 'e80f'

Quote:
Originally Posted by greg_simons
hi folks again
the e80f valve works just fine in the maplin special but i'm unable to detect
much audible difference!!, still sounds great.
greg.
Special quality valves were variants of normal valves made with extra care and superior materials.
They were designed to withstand high levels of vibration or have extended life under low cathode current conditions. E.g. the Brimar 'Trustworthy' range. The Brimar data book has a couple of pages describing the difference.

They can't be expected to deliver a stunningly better performance than a non-SQ equivalent in ordinary use.

As for the E80F being in demand by valve hi-fi purists - maybe, but don't they tend to go in for particular brands, and constructional variants which are suppose to do wonders? Mullard with Yellow lettering, 'long-plate' ECC83s and such.

Pete.
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