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Post by frankie on Apr 18, 2023 14:22:59 GMT -6
Hi,
I got a new Neuman U67 Reissue. I want to exchange the valve.
My first attempts to pull the tube out of the socket failed, since I was afraid to pull too strong? Is there any safety or screw or else to be loosened first? Or can you recommend a tool or procedure that helps?
Best Frankie
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Post by mike on Apr 18, 2023 16:49:03 GMT -6
Hi,
I got a new Neuman U67 Reissue. I want to exchange the valve.
My first attempts to pull the tube out of the socket failed, since I was afraid to pull too strong? Is there any safety or screw or else to be loosened first? Or can you recommend a tool or procedure that helps?
Best Frankie
I have a 67ri also and have rolled several NOS tubes in it. There is no safety or screw on the tube socket to be loosened first once you're inside the body, and while some tubes seems to fit a little tighter than others in general, my method has always been to gently but firmly put one thumb on the white plastic seat the tube sits/fits into with one hand so that as I remove the tube with my other hand the seat itself is Not flexing, and I then typically rock the tube itself back and forth in the socket while gently pulling the tube back, which works better and seems easier on the unit overall to me than pulling hard straight back.
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Post by EmRR on Apr 18, 2023 18:14:31 GMT -6
Use something akin to a pry bar between socket and glass to get it started.
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Post by Ward on Apr 18, 2023 18:50:43 GMT -6
wiggle wiggle
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ericn
Temp
Balance Engineer
Posts: 16,107 
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Post by ericn on Apr 18, 2023 20:25:30 GMT -6
Use something akin to a pry bar between socket and glass to get it started. An old tech turned me on to using a plastic prybar designed for interior work on cars. |
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Post by chessparov on Apr 18, 2023 20:42:24 GMT -6
Was it my Buddy "Slim" Jim?
Chris
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Post by the other mark williams on Apr 19, 2023 22:31:50 GMT -6
Use something akin to a pry bar between socket and glass to get it started. An old tech turned me on to using a plastic prybar designed for interior work on cars. I wonder if a spudger tool would work? I've always ended up doing the gently wiggle wiggle thing, but I never thought about using a spudger until now upon reding yours and Doug's posts. I'm also trying to see how many times I can use the word spudger in one post. |
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ji43
Junior Member
Posts: 67
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Post by ji43 on Apr 21, 2023 7:24:37 GMT -6
I have replaced the valves in my 67 Reissues...don't just try to pull the tube up, but gently rock it side to side, or in a circular motion as you pull up...it will come out of the socket...putting a NOS in is easier than removing the stock tube which feels very tight.
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Post by chessparov on Apr 21, 2023 8:46:24 GMT -6
An old tech turned me on to using a plastic prybar designed for interior work on cars. I wonder if a spudger tool would work? I've always ended up doing the gently wiggle wiggle thing, but I never thought about using a spudger until now upon reding yours and Doug's posts. I'm also trying to see how many times I can use the word spudger in one post. Just don't become a... Couch potato!  Chris |
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Post by ab101 on Apr 21, 2023 9:53:26 GMT -6
I would use the wiggling - and by the way, if possible, do not touch the writing on an NOS tube, unless you do not mind some of the writing disappearing. I was concerned about the oil from fingers based on some things I read, but then I read this on Upscale Audio's website:
"As for the glass itself, despite what some people might tell you, the oil on your fingers will NOT damage the glass or leech through it. Tubes are not halogen bulbs. Tubes may get hot to the touch, but your finger oil will not cause the tube to break when heated up, nor will it affect tube life or sonics. It will not go through the glass."
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Post by Ward on Apr 21, 2023 12:54:35 GMT -6
I have replaced the valves in my 67 Reissues...don't just try to pull the tube up, but gently rock it side to side, or in a circular motion as you pull up...it will come out of the socket...putting a NOS in is easier than removing the stock tube which feels very tight. I did the same, almost immediately. The literature and hype said things like "Neumann specially selected this EF86 to work best to recreate the sound of the original. Maybe Sennheiser accountants did, but I doubt Neumann engineers did. The removal method you describe is exactly what I meant by "wiggle wiggle" in my first reply. As for replacement tubes? A lot of us have come to discover that the TF EF806s is strident and warm, the TF EF806S is punchiest, and the Amperex diamond EF86 is like polished crystal... it just sparkles and wows. The stock tube does none of those things. JMHO |
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ericn
Temp
Balance Engineer
Posts: 16,107
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Post by ericn on Apr 21, 2023 21:42:57 GMT -6
I have replaced the valves in my 67 Reissues...don't just try to pull the tube up, but gently rock it side to side, or in a circular motion as you pull up...it will come out of the socket...putting a NOS in is easier than removing the stock tube which feels very tight. I did the same, almost immediately. The literature and hype said things like "Neumann specially selected this EF86 to work best to recreate the sound of the original. Maybe Sennheiser accountants did, but I doubt Neumann engineers did. The removal method you describe is exactly what I meant by "wiggle wiggle" in my first reply. As for replacement tubes? A lot of us have come to discover that the TF EF806s is strident and warm, the TF EF806S is punchiest, and the Amperex diamond EF86 is like polished crystal... it just sparkles and wows. The stock tube does none of those things. JMHO I always feel for large manufacturers of tube gear when it comes to stock tubes. Their needs are very different: quantity consistency and Sonics that will please everyone. Oh and cost. |
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ji43
Junior Member
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Post by ji43 on Apr 23, 2023 14:32:08 GMT -6
I have replaced the valves in my 67 Reissues...don't just try to pull the tube up, but gently rock it side to side, or in a circular motion as you pull up...it will come out of the socket...putting a NOS in is easier than removing the stock tube which feels very tight. I did the same, almost immediately. The literature and hype said things like "Neumann specially selected this EF86 to work best to recreate the sound of the original. Maybe Sennheiser accountants did, but I doubt Neumann engineers did. The removal method you describe is exactly what I meant by "wiggle wiggle" in my first reply. As for replacement tubes? A lot of us have come to discover that the TF EF806s is strident and warm, the TF EF806S is punchiest, and the Amperex diamond EF86 is like polished crystal... it just sparkles and wows. The stock tube does none of those things. JMHO I spoke to Klaus Heyne and he suggested that the TF EF86 Silver Plates are as good as the 806s in the 67 reissue. The 806s are more expensive, and he said there's no need to spend more money on the 806. The Amperex were his other favorite choice. I do know someone who prefers the stock tube in theirs, so it's ultimately subjective...though for me the NOS was a revelation. I always install NOS glass when I can, and have yet to find a situation where I preferred a modern tube. |
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Post by ab101 on Apr 23, 2023 18:33:34 GMT -6
I did the same, almost immediately. The literature and hype said things like "Neumann specially selected this EF86 to work best to recreate the sound of the original. Maybe Sennheiser accountants did, but I doubt Neumann engineers did. The removal method you describe is exactly what I meant by "wiggle wiggle" in my first reply. As for replacement tubes? A lot of us have come to discover that the TF EF806s is strident and warm, the TF EF806S is punchiest, and the Amperex diamond EF86 is like polished crystal... it just sparkles and wows. The stock tube does none of those things. JMHO I spoke to Klaus Heyne and he suggested that the TF EF86 Silver Plates are as good as the 806s in the 67 reissue. The 806s are more expensive, and he said there's no need to spend more money on the 806. The Amperex were his other favorite choice. I do know someone who prefers the stock tube in theirs, so it's ultimately subjective...though for me the NOS was a revelation. I always install NOS glass when I can, and have yet to find a situation where I preferred a modern tube. True. I just got a pair of silver plates. By the way, the silver plates are also getting more expensive for NOS and from a reliable source. I have also had some good Mullards and even some good Valvos. But the safest purchases I have made have been the Tele Ef806s with diamond on the bottom, where I hardly have ever had a reject. |
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