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Hello all
I have had 2 occasions over the last 12 months of Bendix 5852 tubes leaking oil in my Audio Note M3 pre amp.
Has anyone else had this problem in other installations. Is it a heat issue, or might it be my batch was not good (1960 military issues from tubedepot.com
Follow Ups:
A NOS Bendix 5852 I recently purchased (ca. 1954 in sealed box) as a backup tube for my pre-amp has some dark green substance on the pins where they connect to the tube base. Although I cleaned the pins a little, you can still see it. Scraping it will take it off but I'm not too concerned. Maybe if and when I replace the Bendix 5852 tube already in the pre-amp I'll give it a good cleaning. Photo of the tube shows copper coloration of pins on the middle and left but that's just lighting/reflections. The pins are all silver colored.
Edits: 01/10/10
You know, it's looks like this stuff called Cramolin (I don't remember which specific product) that was used a few years back on light switches, sockets, etc. Anyhow, after awhile (like years) this green gooey stuff would sometimes start to come out of the sockets and outlets. I don't think I've seen the specific product in years.Maybe the tubes were treated with the stuff, while in storage.
Edits: 01/10/10
That's just corrosion, it's not some chemical leaking out of the tube. It's not gooey, it can be wire brushed off the tube pins without much trouble. You see it on almost any tube that was stored in a humid environment, and usually it''s seen where dissimilar materials are in close proximity. Green is the color of the copper oxidation corrosion.Also - Cramolin was the predecessor of Caig's DeOxit line. I still have some small vials of Cramolin from the 1980s - I got it from Old Colony (the merchandise arm of Audio Amateur/Glass Audio back then). There was Cramolin Red and Cramolin Blue, and I believe Caig distributed it at the time.
The material on those pins is NOT Cramolin.
Edits: 01/11/10 01/11/10
happens all the time. sounds better if you can stop the leaking.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
astrostar- Looking at some original Bendix literature I've got on the 6106, it notes the following: " the arc-resistant, compound-filled melamine base with inter-pin barriers permits operation to an altitude of 80,000 feet" and then goes on, "the arc-resistant base is filled with polyester potting compound for high altitude operation". This is what I'm suggesting might be leaking from the base of your 5852s (the potting compound), as yours are also rectifiers with similar "0 - 90,000 feet rating" data. Nothing to do with oil inside the glass or on the surface. Maybe that doesn't describe your issue, but if anyone actually has working experience with certain Bendix rectifiers, they'll know that this "leaking" of the dark potting compound can occur in normal operation, although I'd describe it as more of a very slow and slight exuding of compound through open holes in the base. Let us know if you're describing something very different.
Edits: 01/10/10
Just to not confuse newbies here at AA, tubes do not have oil inside that can leak out from interior to exterior. The oil from one finger print inside would ruin a tube internal vacuum immediately.
Any oil residue must be from a coating applied to the tube exterior for long term storage to prevent corrosion of the tube pins is my only guess.
If You could use idiots as fuel,there wouldŽnt be any energy crises!
"If You could use idiots as fuel,there wouldŽnt be any energy crises!"
Nor any elected officials.
The best way to elect a President would be to launch drop a chimp with a parachute over the US. When the chimp lands and grabs the hand of the first person it sees...that will be the new President. TV goes on uninterrupted and we might be a lot better off. :-)
'When the chimp lands and grabs the hand of the first person it sees...that will be the new President."
Considering the average IQ of my fellow citizens, the chimp might be preferable. :)
Me thinks we are in big trouble. I may have to leave down the road or invent a time machine as 1965 to 1975 was good times in the USA.
If you think 1965 to 1975 were good times in the US, then you probably weren't born yet. Go back and read the history books.
I started working later part of 1960s at Chrysler Corp Engineering Headquarters. Times were great, sorry you did not fair so well.
I am appalled that so few Westerners seem to grasp the permanence of the changes taking place. The machinery that powered us out of the Great Depression and every recession since no longer exists. SE Asia is very near to claiming full economic and political control over most of the planet.
And am appalled that most Westerners don't seem to care. Whatever's the most convenient and cheapest up front- let's do that.
Just so this post has some relevance: Where are most of the really coveted & expensive NOS tubes going? And where do the majority of the U.S. tube consumers (mainly musicians) get their tubes from?
Cory
It's possible those tubes were packed in cosmoline at one time. Here's an article on removing it from firearms. Most of the same principles should apply...
I assume you may mean a dark, thick tarry substance coming out of holes in base after moderate use, right? I've seen this with Bendix 6106s numerous times, different '50s vintages and w/o abuse or circuit malfunction or tube overheating. I don't think it's really a problem in terms of tube functioning. I can tell you that Bendix tubes have continued to work flawlessly for years after this started. I think it's a potting compound in the base, presumably to enhance vibration resistance, etc. Doesn't typically involve the base coming loose at all. Does all that sound like your issue?
Strange. That would have to be glue. The glue for the base. There is no oil in that tube.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Ahh, I bet it is the glue breaking down, maybe due to heat. I''l order some more, and see how they go.
Many thanks for the responses you guys.
Leaking oil? Hmmm....that's strange.
Maybe it needs 10W-40 instead of 5W-30.
Is the filter on tight?
j
Hey man, many thanks for all the great replies! I reckon it is the glue as noted by Jeff A W. I think that is it. The only extra thing I noted, the tube that was leaking got looked at because it was causing a high pitched ringing, not so loud, a bit like and a bit louder than some old TV sets used to do. I was thinking it might be vibration due to the glue leakage, or the tube was going wonky because of the glue. Either way, I popped an NOS example in, and it is fine so far.
I'll persue the Bendix for a while longer, as I dig the extra bass and dynamics it brings to my Audionote M3 pre-amp.
No, 10W-40 is the wrong stuff.
"Hot dog, groat cakes again! Heavy on the 30-weight, mom!"
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