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Old 5th December 2012, 07:33 PM   #11
kmaier is offline kmaier  United States
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Nice pics... left is a Sylvania and right is RCA. Earlier Sylvania versions used 4 coil springs for tension. I'll take either Sylvania over the RCAs (sans the true single-plate version).

Regards, KM
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Old 7th December 2012, 05:30 PM   #12
lausar is offline lausar  United States
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Originally Posted by kmaier View Post
The Fi X 2A3 amplifier has them mounted sideways. I would suggest allowing for the sockets to be rotated a bit as I've not seen too many 2A3 tubes that always line up properly to the base pins as noted in the datasheet.

Personally, I still prefer them mounted vertically, but for NOS tubes, it was a supported practice.

Regards, KM
Been running my JJ's in my X for over a year now. No issues. There should be no issues with 'solid plates' but I wouldn't recommend 'mesh plates' mounted horizontally.
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Old 7th December 2012, 06:02 PM   #13
cotdt is offline cotdt  United States
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who cares if the filaments sag. it makes no difference sonically.
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Old 7th December 2012, 07:35 PM   #14
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who cares if the filaments sag. it makes no difference sonically.
I would wager that the curves would change if the filament sagged closer to the grid therefore changing the "sound" of the tube. The geometry of the tube characterizes the function; distance of grid from plate, distance of grid from cathode (filament in a DHT), distance of cathode from plate ect.

These all effect the mu, gain, and properties of the tube, check out MJ's books for an overview. I would try to stick to vertical mounting whenever possible, other than that as has been previously stated, stick with the datasheets reccomendations as to vert. alignment of the grid and so on. My 2 cents.
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Old 7th December 2012, 09:42 PM   #15
Bigun is online now Bigun  Canada
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here's the filament structure at the top of a JJ 2A3 40
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File Type: jpg JJ 2A3 40.JPG (528.3 KB, 40 views)
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