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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 26th February 2014, 02:05 AM   #1
mpri is offline mpri  United States
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Location: Saint Paul, MN
Default Tube issue or SSE?

Hi all,

I built a SSE and have been using a Sylvania fat bottle 5AR4 rectifier tube in it. I picked it up used at an antique radio flea market in a PA with two RCA 6L6GC’s. I used it for about 7-8 months. I then picked up new on eBay one of the Philips 5V4GA’s which is supposedly a military mislabeled Sylvania fat bottle 5AR4 and started using that. Now about 8 months later I noticed that the getter on the mislabeled Phillips seems to be flaking off. See picture. I took out the old Sylvania and noticed that the getter is also flaking on it too.

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Click the image to open in full size.
Could this be a problem with Sylvania’s in general or something with my SSE? When running the tube doesn’t appear to run hot. I used the standard Allied 6K7VG transformer, C1 and C2 are both external motor run caps, I also use the Allied choke. All the voltages seemed to check out fine the last time I checked them. The amp is running fine and sounds great.

So is the flaking of the getters a problem? If so could it just be the tubes or is the SSE amp tearing them up? Any info would be appreciated.


Last edited by mpri; 28th February 2014 at 08:14 PM.
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Old 26th February 2014, 03:21 AM   #2
moggi1964 is offline moggi1964  England
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I would guess at it being the tube if the voltages check out and it isn't running hot.

If it sound good then I wouldn't be too worried though I might have a backup of a different brand close to hand.
TEAC RH 500 Amplifier Vista Phono1+ w/ TEAC TN-400. Loth-X Ion 1 BS & Emotiva XDA2. WIP: Tubelab SE 300b
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