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I'm not sure now who "just uploaded some pictures of the tool" but there
was no link to the pictures and no mention of what album they are stored
in, making finding the pictures difficult...

Just wanted to contribute to this compilation of long-gone electronics
surplus dealers.


From the late 1960s through the early '80s, I knew of three such stores in
the northern Virginia suburbs of Washington, DC. For a "paper" town, DC
generated quite a bit of electronic surplus, due to government R&D
facilities like NBS and NASA Goddard, military installations, and numerous
contractors and manufacturers serving the national-security market.


Sasco Electronics was an old storefront on King Street in Alexandria, across
the Potomac from DC. Thanks to the construction of a Metro station, the
area is now very upscale, with lots of trendy restaurants, boutiques and
antique shops, but back then it was mostly utilitarian businesses like auto
parts and office supplies. Sasco's display windows and deep, narrow sales
floor were crammed with all kinds of equipment and parts, all at very low
prices. There was also a dungeon-like basement, with bare light bulbs on
the ceiling and rows of crude wooden shelves piled high with every
imaginable type of part, especially big transformers, inductors and
capacitors, most of it top-quality stuff salvaged from military and
commercial gear. The owner was usually seated behind the counter puffing on
a pipe, while a kid at a bench in the back disassembled some piece of
equipment for parts.


Ritco Electronics was a similar operation, housed (as best I can recall) in
one or more large sheds or garage-like buildings in Annandale. Perhaps due
to their larger space, they seemed to have more big/heavy, complete pieces
of equipment than Sasco did.


Electronic Equipment Bank in Vienna was the biggest of the three, and the
one I'm most familiar with since I worked there, for owner Dick Robinson,
occasionally and part-time for a couple of years. Dick was an EE who had
previously been in test equipment sales (for HP, I think). Unlike the other
stores, whose customers were pretty much all hams and other hobbyists, EEB
also did a substantial commercial business. This was in an era when a lot
of vacuum-tube "boatanchor" test gear like Tek 500-series scopes and those
big HP signal generators (606/608?) were still considered viable lab
instruments and could bring real money.


EEB was housed in a large space in a warehouse building with a loading dock,
with neighbors like an HVAC contractor and building supply distributors.
There was an office for Dick and a bookkeeper/admin lady, a showroom, a lab
with two benches, a library/lunchroom with at least six four-drawer file
cabinets stuffed with manuals, a calibration standards lab equipped with
various salvaged items, and a vast storage area on two levels, divided into
several rooms, with heavy steel shelving and equipment piled high
everywhere.


A lot of our stock came from the federal government (GSA) surplus auctions
at the Washington Navy Yard, held in the cavernous former Naval Gun Factory.
The equipment was usually sold in lots which seemed to be randomly assembled
by someone unfamiliar with the merchandise; rumor had it that the security
guard at the exit was there not to prevent theft, but to make sure that no
winning bidder got away without taking *everything* he'd ended up buying!


To get his often huge hauls back to the store, Dick would sometimes hire a
young man of the hippie persuasion, who drove a Step-Van (former Postal
Service truck. I believe) painted in a Star Trek motif, complete with the
Enterprise's "NCC-1701" number, and with a bed for his German Shepherd on
the passenger side.


At some point Dick had acquired two enormous balun transformers, probably
from some high-powered military HF station. They were two long brass
cylinders, maybe 10-12 inches in diameter and 8-10 feet long. They'd been
sitting in our warehouse forever, with no interested customers. But when
our trucker saw them, he immediately knew what to do with them - they became
the "engines" on the roof of his four-wheeled "starship"!


Anyway, one of EEB's specialties was 500-series Tek scopes. They were piled
everywhere in the showroom and warehouse, along with every kind of plug-in.
I worked on a lot of them, and was able to fix quite a few despite my
minimal knowledge of electronics, thanks to the excellent manuals and
assistance from some of Dick's friends who had worked in field service for
Tek or for the various instrument rental and calibration companies in the DC
area.


Albert


From: TekScopes@... <mailto:TekScopes@...>
[mailto:TekScopes@...]
Sent: Sunday, July 31, 2016 9:40 PM
To: TekScopes@... <mailto:TekScopes@...>
Subject: [TekScopes] Re: Eli Heffron's electronic junkyard



I believe that the place in Amesbury was Delta Electronics, I think I still
have one of their old catalogs. Used to run up there a lot in the late 70s.
He would let you wander the place and I do remember the pigeons on the 3rd
floor. Not much good stuff up there on the 3rd floor anyway. Meshna was also
a popular spot, got the 68705P3 for my first Morse Code keyboard from
Meshna. Came out of a gas pump control.

Coming from the Hartford area, we would hit Active Electronics in
Framingham, then up 495 to Verrada in Lowell continuing on to Delta which
was near where 495 and 95 merged. From there, down 95 to the Lynn/Lynnfield
area for Poly Paks and Meshna and then on to Boston to Solid State Sales and
a few computer stores in that area. Made for a long day...

ed WA1TWX

[Non-text portions of this message have been removed]

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Posted by: Edward Oscarson <scskits@... <mailto:scskits@...> >

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HEY RENEE !

In case you're watching right now, disconnect C 1224 and see what you get. Just clean disconnect it.

I cranked up the input voltage on mine and it made CR 1224 short. Then I got a very subdued waveform at the choppers. I got parts changed and it still wasn't right, and then C 1225 exploded.

More details after the heat run.

I might just have to open up a beer even though it is too early. (after the heat run)

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fabio
Trevisan
Sent: Wednesday, April 25, 2018 7:45 AM
To: [email protected]
Subject: [TekScopes] Tek 7623A - Readout omits 2nd zeroes while cold

Hello Group,
Moving on to the next issue (this one is minor... but annoying) on my
recently acquired 7623A.
When I select any scale (either from Vertical amplifier or from Time Base)
that requires 2 zeroes, it displays only one zero while the scope is still
cold.
After warming up for - say - 5 to 10 minutes - it becomes normal.
While it's still cold, also, if I press IDENTIFY, the word identify doesn't
show and instead, it shows (IIRC) a u symbol, in place of one of the zeros
that are currently on display.
I narrowed down the temperature sensitivity to U2232, the "zeroes logic &
memory" IC.
However, I`m not sure if the problem is in it, or if one of the signals
coming into it is at a marginal level, and maybe when U2232 is cold, it's
just misinterpreting the inputs which are marginal.
Fiddling with the "Column Match", or "Row Match" adjustments doesn't have
any impact on the problem... it still "swallows" the second zero while
cold, no matter what position those 2 adjustments are.
So, my questions to the group are:
1. Is there any Tek semiconductor manual available that shows what it has
inside? The "Tek_Made_sm.pdf" available at TekWiki doesn't show it.

2. Does any of you guys have a broken readout board and would be willing to
part this IC with me? I know that Sphere and Qservice have them, so I
already have that as a last resort.

3. On my suspicion that the problem may *not* be at U2232, looking at the
Column decoded signals that enters to it (and which are ultimately sampled
at Time Slot 1 and memorized, to define whether it should add one zero, or
two, or none), I find a little bit odd that the signals there don't really
resemble "logic" levels, each (C1, C2, C3, C4 and C10) are sort of
different from each other, and some of them really look much more analog
signals then a digital signal with clearly distinct discrete levels.
I will try to take pictures from each one probed on my other scope and post
it.
From what I understood, although the original Row and Columns signals are
analog (OK. Discrete 10 levels analog signals)... after they are processed
by the Row and Column decoders, those signals should have been translated
into 10 different "logic" outputs, with only one output showing an "active"
level, and all the other ones showing an "inactive" level (I don't say high
or low because I`m not really sure if they're active high or active low).
Still, those "Column Decoded" digital signals (that don't look like
digital) are the same ones going to the character generator IC matrix...
And there doesn't seem to be a problem for the character generation
circuitry, and all the displayed characters are correct, leading me to
conclude that despite the Column signals don't look like what I expect...
they might be correct anyway.
So my 3rd question: Can any of you take a look at the column decoded
signals (the ones entering at pins 10,11,12,13 and 14 of U2232) and tell me
if they look like digital signals, with clearly distinct "active" and
"inactive" levels?

Thank you in advance for any input...

Rgrds,

Fabio

I just uploaded some pictures of the tool.

Mine has the numbers -0755- hand engraved in the handle so the P/N is 003-0755-00.
I added the page from the Tools Catalog to the album.
/H?kan

Had a BNC installation tool back at Wavetek back in the 1970's. Made in
the shop there. Consisted of a hollow tube which fit on the outside of
the BNC shell, and had a pair of slots the BNC pins fit into. A 3"
crosswise rod served as a handle. The tool held the BNC stationary by
holding the pins, while the BNC nut was tightened.

John KK6IL

On 4/25/2018 12:18 PM, Larry McDavid wrote:

Someone here mentioned a BNC installation tool. I took that in context
to mean a tool that holds a chassis-mount female BNC jack while
tightening the backside nut but I don't find any such tool when
searching, only tools to disconnect mated BNC connectors.

Did I misunderstand what was suggested for straightening bent BNC
connectors or can someone point me to such a tool?

Someone here mentioned a BNC installation tool. I took that in context to mean a tool that holds a chassis-mount female BNC jack while tightening the backside nut but I don't find any such tool when searching, only tools to disconnect mated BNC connectors.
Did I misunderstand what was suggested for straightening bent BNC connectors or can someone point me to such a tool?

What album?

Thanks to many for the info on the available BNC wrench; I never thought to search for "wrench."
Someone who has one of those wrenches (available on eBay and Amazon), please explain if the hex stock it is made from is brass or chem film treated aluminum. Has it been durable?