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I got some Bendix 5852's on ebay a few weeks ago and have had them in my amps for a couple of weeks now whilst evaluating them, this evening I decided to pull them and compare with my fav 1940 brimar 6X5's.
When removed them I noticed dark brown spooge about as thick as cold molasses all in the tube socket, upon inspection it was coming from the 5852's base and running down the pins and also oozing up from the base a 32th or so up around the glass?
I can only think some monkey at some point has tried to secure loose bases with some ick that gets viscous when warm, I cant imagine this being a Bendix issue considering these were used in the Apollo space mission.
It's going to take me a good 45 minutes with goof of and pipe cleaners to clean these bloody sockets now! Grrr...
Has anyone ever come across anything like this before?
Monsanto was the patent holder for PCBs and produced the various Aroclors, 1260, 1254, 1242 starting all the way back in the 1930s. The peak years of use were the mid 1950s up to 1970; finally the US banned production in 1979. Total world wide production was over 1.5 million tons of which it is estimated that 20% is still in the environment.
Just saying, perhaps it would be best to wear nitrile or neoprene gloves and be careful cleaning the tube bases?
Whatever that brown stuff is it probably was a
solid compound back in the early 60's.Years of
the tube just sitting around unused that solid
compound probably started to outgass and separate.
Bendix probably did not think that this tube would
be around for this many years and the equipment
that used it would be scrapped decades before the
outgassing would happen.
You can check it out at the link below. BTW, how do you like the 5852 in comparison to the Brimar 6X5?
"BTW, how do you like the 5852 in comparison to the Brimar 6X5?"
I haven't made my mind up yet so the jury is out, I'll try and post back here with my opinions later.
"the arc-resistant, compound-filled melamine base with inter-pin barriers permits operation to an altitude of 80,000 feet"
Have Fun and Enjoy the Music
"Still Working the Problem"
Wow, that is in the stratosphere. Guess these things were to be used on rockets or ICBMs.
Apparently used in the Apollo Space mission and other space applications, that's why I'm so shocked about the spooge ozzing into my tube sockets, I would have thought this would be a very costly cock up in this type of application.
The jury (Myself) is still out on the sound of these compared to the Brimars, I have a new Mundorf cap in the powerstage that is taking forever to settle in! Or maybe it's not going to and my prior Panasonic fm is just a lot better?
I've been waiting over two weeks for these mundorfs to break in, I was starting to think twice about them. It's funny how some capacitors break in all of a sudden within five or ten minutes and then slowly improve from that point. (Like my Black Gate experiences) I've just had one of those very special sessions there in the "zone" this evening, isn't that what we do this for, these moments.
Well I swapped the Brimars and Bendix a couple of times and for a tube that is truly superb the old Brimars, I'm in some ways a little surprised that the Bendix at ten years newer are just ahead of the game (for me anyway,) digging a little lower with a hair more solidity and a subtle extension in the soundstage, theres also a little more separation I think akin to putting a pair of glasses on and getting just a little bit more focus than usual.
So, I guess spooge cleaning is going to be on the "stand down" checklist from now on.
You think about it, an ICBM or Atlas booster is a one-time deal. My bet is there was a check list to periodically check certain parts when the rockets stood down. And cleaning those tubes was on that list.
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