Bottlehead Forum
General Category => General Discussion => Topic started by: Sugar Man on January 21, 2018, 05:31:46 AM
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So I just had one channel of my Stereomour II lose about 80% of its volume. Switched the 2a3's (JJ's) and the problem moved to the opposite channel. Put my Sovtek's back in and everything is back to normal. Assuming this is just a bad tube. Prior to this, I've noticed that the 4-pin tube sockets are not tight. Is it possible to manually tighten those? I believe I saw a post or two on this somewhere, but couldn't find it again after a search.
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The same loss of volume on one side happened to me with two different pairs of JJ 2A3-40s. As in your case it followed the tube when switching sides. This makes lose sockets a less likely cause. In my case it was a tube failing both times.
Fortunately, my tubes were still under warranty and replaced for free. Ultimately, I switched to Emission Labs solid plate 2A3s and haven't had any problems for more than 2 years.
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Still lust for the EML's true meshies, soundwise and visually. My concern with the loose sockets is that the Eurotube site mentions loose sockets causing tube failure.
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I too had the same problem with the JJ 2A3-40s. Never buying them again.
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When you mention a loose socket, is it failing to make contact with the tube?
The current 4 pin sockets that we use are a bit flexible, which makes them more gentle on the tubes when inserted, but contact quality is quite good.
-PB
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Yes, PB, the 2a3's are loose in the 4-pin holes. Occasionally will have a channel go out and I will adjust the offending tube and sound returns. Can I use a jeweler's screwdriver to adjust them from the top?
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You can squeeze them together a little from the bottom (emphasis on a little).
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Thanks, I'll give that a try - carefully. 8)