ODD VALVE,type 'e80f' - UK Vintage Radio Repair and Restoration Discussion Forum

greg_simons · 22nd Dec 2004, 8:00 pm

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.

mickjjo · 22nd Dec 2004, 8:09 pm

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

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

Regards, Mick.

valvecollector · 22nd Dec 2004, 9:16 pm

Does it look like it has two sections - maybe the second C got rubbed off.

SPCh · 22nd Dec 2004, 10:43 pm

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.

quantum · 23rd Dec 2004, 11:11 am

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.

SPCh · 23rd Dec 2004, 11:36 am

I understood that there were several of these valves.

Difficult to believe they've all had their last letter rubbed off.

valvecollector · 23rd Dec 2004, 1:00 pm

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.

quantum · 23rd Dec 2004, 2:13 pm

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...

greg_simons · 24th Dec 2004, 6:48 pm

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.

paulsherwin · 24th Dec 2004, 8:22 pm

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

Sideband · 26th Dec 2004, 1:11 pm

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.

Rich.

oldeurope · 26th Dec 2004, 5:07 pm

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.

greg_simons · 29th Dec 2004, 10:30 am

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.

Sam · 29th Dec 2004, 3:06 pm

"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

paulsherwin · 29th Dec 2004, 9:48 pm

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

greg_simons · 13th Jan 2005, 10:00 pm

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.

XTC · 14th Jan 2005, 1:07 pm

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.

22nd Dec 2004, 8:00 pm	#1
greg_simons Heptode Join Date: Jul 2004 Location: Evesham, Worcestershire, UK. Posts: 930	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. __________________ Picture, sound?, DOOR.

22nd Dec 2004, 8:09 pm	#2
mickjjo Rest in Peace Join Date: Jul 2004 Location: Dartford, Kent, UK. Posts: 1,661	Re: ODD VALVE Well there is an E80CC if this is any help:- http://www.r-type.org/exhib/aaa0426.htm Regards, Mick.

22nd Dec 2004, 9:16 pm	#3
valvecollector Hexode Join Date: Jul 2003 Location: Leeds, West Yorkshire, UK. Posts: 385	Re: ODD VALVE Does it look like it has two sections - maybe the second C got rubbed off. __________________ Virtual Valve Museum https://valvecollector.uk/ M0RVB

22nd Dec 2004, 10:43 pm	#4
SPCh Rest in Peace Join Date: Nov 2004 Location: Antwerp, Belgium Posts: 345	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.

23rd Dec 2004, 11:36 am	#6
SPCh Rest in Peace Join Date: Nov 2004 Location: Antwerp, Belgium Posts: 345	Re: ODD VALVE I understood that there were several of these valves. Difficult to believe they've all had their last letter rubbed off.

23rd Dec 2004, 2:13 pm	#8
quantum Heptode Join Date: Mar 2003 Location: Birmingham, West Midlands, UK. Posts: 785	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...

24th Dec 2004, 6:48 pm	#9
greg_simons Heptode Join Date: Jul 2004 Location: Evesham, Worcestershire, UK. Posts: 930	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. __________________ Picture, sound?, DOOR.

24th Dec 2004, 8:22 pm	#10
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 21,093	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

26th Dec 2004, 1:11 pm	#11
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 5,971	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. Rich.

26th Dec 2004, 5:07 pm	#12
oldeurope Heptode Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	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. __________________ RADIO & TV SERVICE oldeurope's blogs

29th Dec 2004, 10:30 am	#13
greg_simons Heptode Join Date: Jul 2004 Location: Evesham, Worcestershire, UK. Posts: 930	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.

29th Dec 2004, 3:06 pm	#14
Sam Hexode Join Date: Apr 2003 Location: Higham-on-the-Hill, Leicestershire, UK. Posts: 338	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 __________________ Can he lead a Normal life, Doctor? No, he will be ... an Engineer.

13th Jan 2005, 10:00 pm	#16
greg_simons Heptode Join Date: Jul 2004 Location: Evesham, Worcestershire, UK. Posts: 930	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.