Mounting position EL84 - diyAudio
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Old 4th August 2013, 09:09 AM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Mounting position EL84

This is a question from the 5Y3 thread,

So is it possible to mount EL84 horizontal, I don't see any information about pin alignment. (Why?)
In TV's in the past all the tubes were horizontal even the TV tube gun.

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M. Gregg
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Old 4th August 2013, 09:38 AM   #2
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For NOS tubes, it would not concern me at all. See General Electric data sheet.

For new production tubes, my instinct would be that it's fine too... unless someone has specific information to the contrary (other than theory and Internet rumor)!

There is an increased possibility, I have heard, that under high power conditions, the grids could bend too close to each other and some say it shortens the life of the valve but it is your choice as it is all hearsay and theory. I have been working with valves ever since 1960 and have never found an issue with the positioning.
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Old 4th August 2013, 09:55 AM   #3
M Gregg is offline M Gregg  United Kingdom
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Thank's,

Yes I think this is all about direct and indirect heating. The EL34 has been mounted for decades in the horizontal mode, even PYE did it in the Mozart.
(Heater sag)

Link:
http://www.google.co.uk/search?q=pye...w=1455&bih=685

I have never read anything about it but was that the reason for the change to indirect heating? (The TV horizontal mounting)

Is the EL84 an exact copy in miniature of the EL34 (scaled down)? Its a shame I don't have some old ones to strip and compare. If it is then it would be interesting to see how PYE mounted (orientation) and put the EL84 the same. They ran for decades with no problems. Marshall also do it with EL34.

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M. Gregg
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Old 4th August 2013, 10:28 AM   #4
jazz is offline jazz  Netherlands
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I've been using em (JJ's) in that position for a couple of months now and have had no problems. So it seems fine to me.

Joris
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Old 4th August 2013, 11:51 AM   #5
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Very innovating in 1958 to use a speaker winding in the cathode of the output pentode as feedback with fixed bias!
My Grandad designed and cut out the first fretwork for the PYE logo, in Cambridge. Maybe that is where my interest for electronics came from.
Sadly gone now.
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Old 4th August 2013, 12:24 PM   #6
M Gregg is offline M Gregg  United Kingdom
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PYE has a sound all of its own,

Well looking at this picture the EL34 plates seem to be at 45 deg.


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M. Gregg
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Old 4th August 2013, 09:35 PM   #7
DF96 is offline DF96  England
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If a valve datasheet says nothing about pin orientation for horizontal mounting then you can assume that it doesn't matter. Of course, to be certain you should consult the sheet from the actual manufacturer although they usually all say the same for a particular type.
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