Junk box finds

[Enzo]

I've been pawing through my accumulated crap lately, even shipped some of it off to a friend. It is fun what I discover that I never knew I had.

I found a baggie with two resistors in it. green, blue, blue. 56 meg!

My meter won't read that high, can't imagine where I got them or what they were ever for. Half watt, but they are only 20%. I'd prefer my 56 meg resistors to be 5%, don't you?

Also found an oil filled cap. I have a whole pile of oil filled caps. Boxes. But most of those are the hermetically sealed metal can types. This one is a glass cylinder a couple inches long and an inch in diameter, and metal end caps. Looks a bit like a giant fuse. a 6-32 stud out each end and a solder lug under a nut there. The innards are bright red, and it is from CHicago COndenser Corp. 0.1mfd 10% 3000 volts DC.

Between the wall of the glass and the innards is a little space, and I can see it is full of oil. There is a little air space in there, so I can tip it one way or the other and watch it flow. It is cool looking. I haven't tested it for leakage - electrical or fluid - but I'd really like to stick it in an amp just so someone in the future can spot it and wonder.

[Don Symes]

That glass/oil cap has GOT to be full of PolyClorinatedBiphenyls - bad, BAD stuff (carcinogenic and teratogenic). If you want to keep it around, casting it into a block of acrylic or something durable would be kinda neat (and my choice).

Pretty sure the rest of those oil caps are gonna be PCB-oil as well. Please locate a haz-mat specialist for proper disposal.

Use care, good Sir.

[Enzo]

Don't worry, I think they are encased in lead. I rarely chew on it any more.

Yes, I'm joking.


The exterior of the glass cap is pristine - no sign of leakage on it or the unit it came from.

I don't doubt the pcb content of this stuff, most of these caps are from the world war 2 era and after, though some are coded as late as 1963.

[Carl / Zwengel Amps]

Aint it amazing the crap you find laying around after you've been doing this stuff for a while! Ive got piles of old Marshall and Fender pots from the 60's, as well as the old blue tubular caps, socket bases, eyelet boards, etc. Most of it's pulls so I doubt they'd be worth much of anything.

I've got a laundry list of old NOS tubes I really should toss on the tester and see if they're any damn good. RCA blackplate 6L6's, Siemens and Mullard EL34's, Amprex AX7 and AT7's, several small signal pentodes.

Couple weeks ago I found some old Telefunken 9 pin tubes in a box....have no clue what the hell they are as the printing is long gone but it's got the diamond molded in the bottom. Bout the size of an AT7, and its also got a wire mesh screen wrapped around the plates. Anybody have a clue what this MIGHT be?

-Carl

[steve]

Couple weeks ago I found some old Telefunken 9 pin tubes in a box....have no clue what the hell they are as the printing is long gone but it's got the diamond molded in the bottom. Bout the size of an AT7, and its also got a wire mesh screen wrapped around the plates. Anybody have a clue what this MIGHT be?
-Carl

I have some Mullard 6762/EF86s that look like that.

steve

[SlidePicker]

Enzo, I usually just substitute a nice wide open space for 56 Meg resistors. It's worked so far.

[Carl / Zwengel Amps]

Just off the top of my head it's probably for some part of a circuit that's got a switch on it. They either didnt want to leave an open terminal or an unterminated capacitor or something else along those lines.

-Carl

[Enzo]

I am just trying to imagine the engineering discussion over what the 56M will offer over a measly 5.6M.

[Carl / Zwengel Amps]

I have some Mullard 6762/EF86s that look like that.

steve

I think the oddball tube i mentioned is something called a UF86. Not sure exactly how it differs from an EF86 as the specs seem fundamentally identical.

-Carl

[steve]

I think the filament voltage is different. A UCL82 is the 50v version of the ECL82/6BM8. UF86 is the 50v filament version of the EF86.

http://www.mif.pg.gda.pl/homepages/f...30/u/UCL82.pdf

steve

I think the oddball tube i mentioned is something called a UF86. Not sure exactly how it differs from an EF86 as the specs seem fundamentally identical.

-Carl

[dai h.]

I've got some of those 'U' prefix tubes, like UF89, UF80, UAA91, UBF80 (all Telefunken). I think they were basically series-string heater tubes (and not all the same heater voltage rating even with the same 'U' prefix IIRC). Probably meant for radios originally.