Do look into shipping by bus.
-bus station to bus station
-sending and receiving parties go to the bus stations
- not very expensive
-May not be very fast
-packages are handled by people not massive factories of heartless conveyer belts.
I sent two MITE teletypes in one box successfully. (Maybe 65 pounds)
Find heavy duty cartons or "dish packs" from U-Haul, cut down to size if needed.
Roy Morgan
K1LKY Western Mass
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On Sep 23, 2020, at 10:31 AM, Eric <ericsp@...> wrote:
?Ups , FedEx. At least in the US. Use heavy card board and at minimum 2
inches of loose padding all round for shock. I have gotten them double
boxes before and a 576 even in a wooden crate the trick is limiting
movement in the box I double boxed a high end computer it made it safely to
California from the east side. But it was not cheap to ship. I have also
been successful crating things and shipping them freight. Plywood and
padding is wonder for protecting the device.
On Wed, Sep 23, 2020, 10:26 AM Adam Beasley <abeasley@...> wrote:
Is there a good service to use to ship scopes? The only boxes I have
available are from Amazon and they are not very sturdy so I wouldn't trust
shipping something heavy and expensive in them.
Thanks,
Adam
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Here's a page on a fabulous, late 570 I sold into Japan in 2000:
and here's a page detailing the crate I made to get there in one piece:
And, just for fun, a page of pix of the internals:
Bill @ PEARL, Inc.
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Fedex and UPS pack things fairly well, I have not had any damage.
It can be pricey, but is usually less then traveling to pick something up.
Some people offering equipment demand that you pick it up from them. I
have accounts with both Fedex and UPS, that allows me to take care of
everything from my end and convince reluctant sellers to take items to
the stores. I ask everyone who demands pickup only to reconsider and be
willing to take the item to a shipper who will take care of the packing
and shipping.
Bruce Gentry, KA2IVY
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"Apparently even Tektronics was not above a well executed kludge."
Please stop this. Bad enough in ebay listings, but here?
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Re: Looking for calculator keyboard for 7854
I have no idea how they lost it, but apparently it's not unusual for the GSP to lose packages; apparently it arrived in the UK and the courier is still waiting for it (a month since it got to the UK). Ity will probably turn up in a lost items auction and end up back on ebay or being tossed in the rubbish bin
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Yes, isn't it.
Apparently even Tektronics was not above a well executed kludge.
Thomas Garson
Aural Technology, Ashland, OR
By my calculation, the dynamic range of the universe is roughly 679dB,
which is approximately 225 bits, collected at a rate 1.714287514x10^23 sps.
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On 9/22/20 10:52 PM, ykochcal wrote: Interesting dead bug looking patch in the last picture
John
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Fedex and UPS pack things fairly well, I have not had any damage. It can be pricey, but is usually less then traveling to pick something up. Some people offering equipment demand that you pick it up from them. I have accounts with both Fedex and UPS, that allows me to take care of everything from my end and convince reluctant sellers to take items to the stores. I ask everyone who demands pickup only to reconsider and be willing to take the item to a shipper who will take care of the packing and shipping.
Bruce Gentry, KA2IVY
toggle quoted message
Show quoted text
On 9/23/20 10:31 AM, Eric wrote: Ups , FedEx. At least in the US. Use heavy card board and at minimum 2
inches of loose padding all round for shock. I have gotten them double
boxes before and a 576 even in a wooden crate the trick is limiting
movement in the box I double boxed a high end computer it made it safely to
California from the east side. But it was not cheap to ship. I have also
been successful crating things and shipping them freight. Plywood and
padding is wonder for protecting the device.
On Wed, Sep 23, 2020, 10:26 AM Adam Beasley <abeasley@...> wrote:
Is there a good service to use to ship scopes? The only boxes I have
available are from Amazon and they are not very sturdy so I wouldn't trust
shipping something heavy and expensive in them.
Thanks,
Adam
|
Ups , FedEx. At least in the US. Use heavy card board and at minimum 2
inches of loose padding all round for shock. I have gotten them double
boxes before and a 576 even in a wooden crate the trick is limiting
movement in the box I double boxed a high end computer it made it safely to
California from the east side. But it was not cheap to ship. I have also
been successful crating things and shipping them freight. Plywood and
padding is wonder for protecting the device.
toggle quoted message
Show quoted text
On Wed, Sep 23, 2020, 10:26 AM Adam Beasley <abeasley@...> wrote: Is there a good service to use to ship scopes? The only boxes I have
available are from Amazon and they are not very sturdy so I wouldn't trust
shipping something heavy and expensive in them.
Thanks,
Adam
|
Depending on how many boxes you need check out Uline.? They have double wall boxes of all sizes.? Staples have some boxes that are better than the Amazon boxes.??
73,
Bill, WA2DVUCape May, NJ
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On Wednesday, September 23, 2020, 10:26:12 AM EDT, Adam Beasley <abeasley@...> wrote:
Is there a good service to use to ship scopes?? The only boxes I have available are from Amazon and they are not very sturdy so I wouldn't trust shipping something heavy and expensive in them.
Thanks,
Adam
|
Is there a good service to use to ship scopes? The only boxes I have available are from Amazon and they are not very sturdy so I wouldn't trust shipping something heavy and expensive in them.
Thanks,
Adam
|
Re: Is my Tek 468 beyond repair?
You're right - my fingers were typing faster than my brain.
SCM
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Re: Is my Tek 468 beyond repair?
Replacement 5V crystal arrived today. Extremely fast dispatch but its output is only 1.2Vpp and nowhere near the expected TTL level!
I modeled satbegginers idea in LTSpice but couldn't get it to work properly. The output was barely above zero. Scm's idea works well enough though provided NPN collector goes to Vcc and PNP collector goes to ground! I used 2N2222 for the NPN (transition frequency=250MHz) and 2N2907 for the PNP (transition frequency=200MHz).
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Re: 7623A Storage problem
Colin,
I had the afterthought about low voltages since the regulation of the power transistor Q1195 relies on +5V, +15V and +130V being OK. The components I mentioned are all on the low voltage side of the transformer T1199 and can be checked with the power off. Q1195 is attached by a plug and socket so it can effectively be tested out of circuit, Q1190 can be checked as a pair of diodes for open circuit / short circuit. The two capacitors are likely to be short circuit if they have failed and L1198 will be open circuit if the fuse didn't do its job in time.
At least you don't have to wait 30 minutes for the high voltage to leak away!
Regards,
Roger
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Re: Tek 7854 intermittent issues
On 23. Sep 2020, at 14:57, Chuck Harris <cfharris@...> wrote: ....
My favorite is the bootstrap capacitor, which is
invariably some cheap piece of Chinese garbage
capacitor in a sea of Nichicon's, or other good
quality capacitors. Chuck, thats how I would engineer if I wanted planned obsolescence... a nice single point of failure. cheers Martin
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Re: Tek 7854 intermittent issues
Honestly, that is what I find in about 80% of the
repairs I do. A single poorly sourced capacitor
wrecked all orderly operation.
My favorite is the bootstrap capacitor, which is
invariably some cheap piece of Chinese garbage
capacitor in a sea of Nichicon's, or other good
quality capacitors.
-Chuck Harris
David C. Partridge wrote:
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The ripple on the -5V looked really quite high ...
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nick Corvid
Sent: 23 September 2020 09:29
To: [email protected]
Subject: Re: [TekScopes] Tek 7854 intermittent issues
Not very good at finding things on schematics but I'm fairly sure that the funky looking capacitor is A27C321 I'll have to look through my stuff and see if I have a spare of a decent value on hand. Also if I'm reading things correctly it has to do with the +5 volt rail, but it seems strange that all these issues would be caused by a single sad cap that's kind of out of the way. So I'll keep looking for what is causing these problems in the meantime before I find a replacement and see if that changes anything at all.
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Re: Tek 7854 intermittent issues
The ripple on the -5V looked really quite high ...
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Nick Corvid Sent: 23 September 2020 09:29 To: [email protected]Subject: Re: [TekScopes] Tek 7854 intermittent issues Not very good at finding things on schematics but I'm fairly sure that the funky looking capacitor is A27C321 I'll have to look through my stuff and see if I have a spare of a decent value on hand. Also if I'm reading things correctly it has to do with the +5 volt rail, but it seems strange that all these issues would be caused by a single sad cap that's kind of out of the way. So I'll keep looking for what is causing these problems in the meantime before I find a replacement and see if that changes anything at all.
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Re: 7623A Storage problem
Hi Roger,
Thanks for all the ideas. I am a bit careful with voltages over 1 KV, but in the past, when I was still at school, I caught a belt at 2 KV on a homebrew scope that I was trying to build. This was from a mains-transformer supply with a voltage doubler and so was low-impedance and capable of quite a whack. It came about from a leaky capacitor which was supposed to be keeping the X-modulation input safe. More fool me!
With regard to the 7623A, I think I mentioned that I had checked all of the voltages from the low-voltage DC supply and found that they were all in spec. I might also have mentioned that I could see the sweep output on the BNC at the back of the scope, so a good few voltages are obviously ok.
I suppose I should gird my loins and try to gain safe access to the high-voltage board and that heat-sunk transistor Q1195.
Colin.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Roger Evans via groups.io Sent: 23 September 2020 11:13 To: [email protected]Subject: Re: [TekScopes] 7623A Storage problem Apologies - I skipped the very important 'check all the low voltage DC supplies', there are so many inter-dependencies in these scopes. Roger
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Re: 7623A Storage problem
Apologies - I skipped the very important 'check all the low voltage DC supplies', there are so many inter-dependencies in these scopes.
Roger
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Re: 7623A Storage problem
Colin,
The voltage on the 'collector' together with the voltage on the front mesh of the storage tube depend on a +600V supply derived from a separate winding on the HV transformer. So the lack of +150V on the collector traces back to the lack of -1475V on the CRT.
The usual suspects for failure of the -1475V are the heat-sinked drive transistor Q1195 and the power supply decoupling components C1198 and L1198. Q1190 is also worth checking and C1224 (is it one of the failure prone tantalums?) will kill the drive to Q1195 if it (ie C1224) goes short circuit. There is a fuse in the unregulated supply to Q1195, (F814) which is on the low voltage regulator board.
There are of course other potential failures on the HV side of the -1475V supply.
Regards,
Roger
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Re: Tek 7854 intermittent issues
Not very good at finding things on schematics but I'm fairly sure that the funky looking capacitor is A27C321 I'll have to look through my stuff and see if I have a spare of a decent value on hand. Also if I'm reading things correctly it has to do with the +5 volt rail, but it seems strange that all these issues would be caused by a single sad cap that's kind of out of the way. So I'll keep looking for what is causing these problems in the meantime before I find a replacement and see if that changes anything at all.
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Interesting dead bug looking patch in the last picture
John
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Bill Perkins
Bill Riches
Martin
David C. Partridge