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Christian,

Don't be daunted.

I am also pretty new to this list ( and the sister list for manuals ).
But I found some very nice and helpful people here.

Regards,


Peter van Daalen
Amsterdam.
PE1ECM

Looking for a DM44 to go with my TEK 465 scope. Please conatct me
directly, k0dan@...

thanks!

dt

I agree with Craig. Don't be such snobs..

I think the key point is this - there are 1062 members currently on the
Tekscopes list. Whenever posting something, it is important to ask this
question - "If I was actually standing on a stage in front of an auditorium
with over 1000 people from all nations in front of me - would I actually say
this?".

If the answer is "no way" it is time to keep ones mouth firmly shut.

And yes - if anyone has missed the point, I feel very strongly about this.

Craig

Tektronix

I apologise for the obvious offence my ignorance and poor spelling
has caused.

Best Regards

Christian Fletcher

He is from the UK after all. I think you cut him some slack just based on
on the issues he's had with the car he's restoring! He's sounds like a very
interesting chap and it's nice to have some diversity here.

I agree with Craig. Don't be such snobs...

No, no, Fred. Those differently-literate people serve an
important purpose:

Hey - c'mon you guys! If I'd joined the list having got hold of a 549
storage scope, and everyone got anal with me about the way I spelt a damned
word, I'd be off like a shot and good riddance!!

Cut the guy some slack, OK?

Craig

No, no, Fred. Those differently-literate people serve an important purpose:
to supply cheap equipment to the rest of us! After all, "Tectronics" gear
can be had dirt cheap on eBay compared to "Tektronix" gear, because nobody
can find it in their search engine.

-- jm

I seckond the nomination
Phil (new membur)

I can get for nearly free ( 5 Euro = USD 6.50 per pc ) some scopes
and plug ins :
3S76 3T77A 3T4 3S2 as well as the scopes RM564 ( incl. 3S2 and 3T2 )
and a RM561A ( incl. 3S1 and 3T2 ).

Do all these plugins fit in either scope ?

Where to find specs on the internet ? ( I found a wealth on info on
the 7000 series and the 7xyz plug ins but not for the said 3xyz
plugin series ).

Thanks for any help.
Peter PE1ECM

Fellow Tekkers,

Please be aware that, when trying to E-mail me directly, our domain's spam filters have been known to get overzealous. I can and will 'whitelist' individual addresses, but I can't do it if I don't know that you tried to get through (and subsequently got bounced).

If your mail attempt to me does bounce, please try posting a brief note to me here. That will cue me to take a hard look at the reject log, and see if I can find where things went wrong.

Also, please keep in mind that a bounce is NEVER directed at anyone personally, and they should not be taken personally. The IP ranges I block are directed solely at abusive ISPs who, for whatever reason, have chosen not to address their infestations of spammers and other network abusers.

Thanks much.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"

I Would Send You Some Files, But All Your E-Mail Addresses Bounce.

Greyhawk

Dear Friends

I have a small collection of test equipment and recently been
donated a Techtronics 549 storage oscilloscope. The unit has had
little use but many years of storage makes me think a tune up is in
order. Can anybody please help me with service manual and operating
instruction. The display screen makes a very good alternative to a
lava lamp but not so good for storage of a waveform.

So far I have done a few essential safety test and powered up the
scope. The circuit boards have many small neon tubes on them. Are
these being used as some kind of voltage regulator I have not seen
this before ?

My knowledge of scopes really only extends to using them, any advice
for cleaning up the scope and servicing it and any known bugs with
this scope.

The unit also has the fan guard missing off the back and a broken
selector switch. Can anybody help me with spares. I have some
pictures of the scope and my other items. Please visit my site and
look at the museum and bench view pages.

Best regards Christian Fletcher. www.christianfletcher.org

In message <051a01c4034e$adc5cb90$0300a8c0@LianLi>, Robert Morein <morepub@...> writes

A friend of mine is afraid to work on a three gun projector, which coincidentally has the same anode voltage as the 7704, 7904, etc, 24 KV.

Well he should be cautious. Isn't the point here that it isn't just the static charge on the scope we are talking about but the capability of the PSU to deliver as no matter how small the energy charge that the tube will hold I'll bet you a pound to a penny that the PSU has more than enough oomph to kill you.

I don't blame him. It scares me too. To the point that I have a number of separate meters to dangle round stuff before I power it up (when it is very high volts) so I don't have to dab round any more than necessary. Paranoia I know but there's only one of me and components are easily replaced.

Robin

It is my understanding that this voltage is not lethal, primarily because the CRT is too small to store a lethal charge.

Elsewhere, I have read that the lethal threshold, at least as far as TV tubes are concerned, is around 32 inches.

Comments? Any reassuring words for my friend?






Yahoo! Groups Links

--
Robin Birch

-- whereas
one of their last new kits created, the Model IG-4244: beats out Tek's
and HP's expensive spread, while also providing a clean typ. 700 pSec Tr
into 50 ohms. Not a 284, but plenty fine for sum-squares verification
to 350 MHz.

My favourite is the Tek 111 pretrigger pulse generator. This is an
avalanche pulser, and gives a really clean 400ps rise time. Since it has an
adjustable delay between a pretrigger pulse and the main output you can kick
a timebase into action well in advance of the main event. This is OK for
testing things using a 7T11/7S11/S1 set up with 1GHz bandwidth (using sum of
squares). Or (and I haven't tried this) use the 400ps edge to trigger a
tunnel diode pulser to generate a really fast event, but with an adjustable
pretrigger.

Craig

Bet that would blow the gate on a MOSFET ;-)

Craig

OK folks,

I think I have the process in pretty good control. I am willing to
cast some replacement feet for 453, 454, -A, 464, and I think they
also fit the 465, 475, 485 series of scopes. (These are the bottom
feet, not the rear feet!)

I cannot do a lot. I can cast and cure one set of 4 feet per day,
if I'm not distracted by something else. I'm not doing this for any
profit, just to help some of you fellow Tek junkies. And to recoup
some of my $75 investment in casting chems.

To see what the recast feet look like, please see:



These are pretty close reproductions of Tek part 348-0080-00 or -
01. The original models are unused NOS that Stan provided. The
rubber is a little softer than the originals, and quite a bit
blacker. A quick abrasion test with 200 grit sandpaper indicates
they are about as abrasion resistant as the originals. They are
more suseptable to cuts, though. Very, very usable, but not 100%
authentic. Replace the entire set of 4 if you want to resell the
scope, due to the noticable color difference.

The deal would be - $6.00 (that is $5.00 and about $1.00 S&H) plus a
set of nuts (alloy inserts) that I can use for the next set of 4
feet. I would also consider 2 sets of the nuts plus $1.00 S&H for
one set of repros.

If anyone is interested, please contact me here first.

Good scoping,
-Howard

With thanks to Fred de Vries, I've posted a ZIPfile containing EPROM images for the devices in the 7D20. They're version 81.1, F1.03.

Filename is 7d20.zip at the usual location and path.

Contributions always welcome! ;-)


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"

Have seen some unbuilt Heathkits (scopes and other pretty trivial gadgets) go for astronomical prices, though I'm not not looking often now. Ego-bid war between two will do it: $900 IIRC, and several >500.

People will also pay lots for Heath's earlier (green case) calibrator, with not very impressive specs; unuseable for fast Tr check. -- whereas one of their last new kits created, the Model IG-4244: beats out Tek's and HP's expensive spread, while also providing a clean typ. 700 pSec Tr into 50 ohms. Not a 284, but plenty fine for sum-squares verification to 350 MHz. These have occasionally shown up and slipped through the cracks - I bought a spare for my hand-assembled one for ~$50.

'Course too, *cough* one of those Warz got me ~$420 for a Tek 453! (admittedly pristine, calibrated, photographed Tr.) in about '00 or '01.

Call it Psych 101A?


{cackle}

Ashton

Tony Denning wrote:

Speaking of High Voltage - check this out....



and the explanation.....



DEFINITELY LETHAL!!!!!!!!!