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PSA regarding tubes
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davetheslave
RM100


Joined: 09 Apr 2011
Posts: 240
Location: West Oz

PostPosted: Mon Mar 24, 2014 9:52 pm    Post subject: Reply with quote

Thanks for posting this Rob. I've been having heaps of the said problems with my LoneClean and even though I had been changing the tubes I had consistently been putting one of the sovteks in V2. Once I changed it to one of the better tubes in V2 it's gone back to being a gig worthy module.
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MarcoR
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Joined: 02 May 2007
Posts: 886
Location: Frederick, MD

PostPosted: Fri Mar 13, 2015 6:53 am    Post subject: Reply with quote

I had a new JJ HG+ from Valve Queen in the V2 position go out last night...
I thought the JJ was safe there but apparently not? When the Mullards died there, it was just a huge drop in volume but last night I was jamming and it was sounding off the hook and then dead instantly! No sound... Never had it happen like that before.

I popped out the module, pulled the JJ in V2 and tested it in the Orange VT1000 and sure enough... it didn't get halfway through the test and came back with a big FAIL. Confused
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suphuckers
Lynch Box


Joined: 05 Aug 2014
Posts: 689
Location: Under a Tree Near the Stage Coach Inn Museum

PostPosted: Fri Mar 13, 2015 7:07 am    Post subject: Reply with quote

I've had some JJ's fail there also Marco. I think the point was that some other tubes fail much faster/sooner. Some of them immediately. No tube will last forever. Any tube can fail at any time in any socket.
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Jaded Faith
Moderator


Joined: 14 Jul 2007
Posts: 2658
Location: Hamilton, NJ

PostPosted: Fri Mar 13, 2015 7:12 am    Post subject: Reply with quote

I wouldn't worry about that one Marco, tubes can (and do) fail. Laura is great and her tubes are excellent. It just failed before it's time. I stock and use more JJ preamp tubes than any other and they are extremely reliable, quiet and consistently the highest gain on average.

As a side note story, I just had an amp come back into the shop Tuesday that was picked up last Friday. One of the brand new Sovtek 12AX7's had a small base pin fracture that went unnoticed until he drove it home and fired it up. The crack became a vacuum leak and the tube died. It happens.
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MarcoR
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Joined: 02 May 2007
Posts: 886
Location: Frederick, MD

PostPosted: Fri Mar 13, 2015 7:43 am    Post subject: Reply with quote

I had just put the tube in the night before so it was fresh from VQ. This batch was the best batch of tubes I think I've ever ordered; I tested them all when I got them and they all tested great and better than anything I had on hand.

The good news is I was going to put that one in my VHT 2502 and I'm glad I didn't! That's a lot of screws to get the top off! Laughing
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Yatagan
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Joined: 20 Jul 2015
Posts: 71
Location: NORWAY

PostPosted: Thu Jul 23, 2015 6:54 pm    Post subject: Reply with quote

Rob

In general, are there a specific type of JJ's you typically would recommend for the modules? Are there types that will give a varmer tone than others?

Finally would the Preferred Series 7025 / 12AX7 tubes improve or alter the sound and/ or sensitivity significantly?
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