Re: New to Tek 465B operation
If you don't need the bandwidth, and if it's acceptable to you to load the circuit under test with a very large capacitance, then a 1x probe is fine. Since a 1x probe is not much more than a piece of coax with a pointy tip, the manufacturer doesn't matter so much.
Some probes can act as 1x or 10x probes, depending on the position of a switch on the probe. But genuine Tek probes communicate their attenuation factor to the scope automatically through the spring-loaded thing I mentioned previously. No user action is needed. The correct scale light illuminates by itself. If you use an off-label probe, you have to do the math yourself. The scale light for 1x will always be on, so you'll just have to keep track of the decimal point in your head.
There are very inexpensive "P6100" probes available on eBay and other places. These are not nearly as good as Tek probes, but they're also a heck of a lot cheaper. We did a bulk buy of these for our undergraduate teaching labs, and we paid just under $4 each, including shipping. They are rated to 100MHz, and measurements show that they actually meet spec, although they are clearly inferior to true Tek probes (step response has worse aberrations, frequency response is not as flat). But they're a good value for what we need them to do. These have a switch that allows you to select 1x or 10x mode, so they're versatile. They claim a 600V rating, but a teardown shows that they just made up that number. I'd feel nervous about using them above 300V.
--Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 4/27/2021 05:18, jgiv510070@... wrote: Thank you Tom,
I see that now. I don¡¯t have the original probes and have never looked at a set. Generic probes will work ok at 1x or are genuine Tek probes the way to go? Initially I thought that¡¯s what the 10X button was to use the probe as 10X...
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Re: New to Tek 465B operation
If you don't need the bandwidth, and if it's acceptable to you to load the circuit under test with a very large capacitance, then a 1x probe is fine. Since a 1x probe is not much more than a piece of coax with a pointy tip, the manufacturer doesn't matter so much.
Some probes can act as 1x or 10x probes, depending on the position of a switch on the probe. But genuine Tek probes communicate their attenuation factor to the scope automatically through the spring-loaded thing I mentioned previously. No user action is needed. The correct scale light illuminates by itself. If you use an off-label probe, you have to do the math yourself. The scale light for 1x will always be on, so you'll just have to keep track of the decimal point in your head.
There are very inexpensive "P6100" probes available on eBay and other places. These are not nearly as good as Tek probes, but they're also a heck of a lot cheaper. We did a bulk buy of these for our undergraduate teaching labs, and we paid just under $4 each, including shipping. They are rated to 100MHz, and measurements show that they actually meet spec, although they are clearly inferior to true Tek probes (step response has worse aberrations, frequency response is not as flat). But they're a good value for what we need them to do. These have a switch that allows you to select 1x or 10x mode, so they're versatile. They claim a 600V rating, but a teardown shows that they just made up that number. I'd feel nervous about using them above 300V.
--Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 4/27/2021 05:18, jgiv510070@... wrote: Thank you Tom,
I see that now. I don¡¯t have the original probes and have never looked at a set. Generic probes will work ok at 1x or are genuine Tek probes the way to go? Initially I thought that¡¯s what the 10X button was to use the probe as 10X...
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Re: 465 Electrolytic Capacitor Replacement
I second Brad's warning. Compressed air is a Very Bad Idea(tm) here.
--Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 4/27/2021 13:12, Brad Thompson wrote: Bill (?)- wrote on 4/27/2021 12:40 PM:
?? I agree with Stephen. Use enough iron! <much good information omitted>
Hello--
Under no circumstances should you use compressed air to
clear the molten solder from printed-circuit boards. Chaos ensues.
73--
Brad? AA1IP
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7A16A with an unknown modification MOD515D
I came across this 7A16A on Ebay cheap so I bought it. Good entertainment! It has a strange modification that I cannot identify. Looked everywhere I can think of but can't find any info on it... /g/TekScopes/album?id=263432It seems to work but the attenuator range is off and when you reposition the trace with it's control it also affects the signal level. If I can't find any info on it I will most likely just remove the mod and return it to a normal 7A16A state.
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Re: Update: 2nd life for a 575 / capacitor condition facts
Hello,
right now I assume I have examined almost all possible suspects (capacitors) in the 575. In addition to my above discussed list above here are test results for black body "Sprague 160 P" capacitors stamped with red letters, rated 0.047 ?F rated 400 V DC. There are three individuals that have been checked:
No. 1 measured 0.062 ?F, V Loss 1.8 %
No. 2 measured 0.067 ?F, V Loss 2.2 %
No. 3 measured 0.062 ?F, V Loss 2.1 %
No question, these capacitors now have been retired! It is time to reassemble the instrument and post some photos soon.
Well, then I will need the to build the VTCT adaptor. And there are even some more "boat anchors" sitting on my bench, waiting to be taken care for: A 585 and a 565.
Regards, Joe
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Re: New to Tek 465B operation
Thank you Tom,
I see that now. I don¡¯t have the original probes and have never looked at a set. Generic probes will work ok at 1x or are genuine Tek probes the way to go? Initially I thought that¡¯s what the 10X button was to use the probe as 10X...
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Re: New to Tek 465B operation
Thanks Dave. I have downloaded every manual I can find, and the Tek troubleshooting your oscilloscope guide as well. Spent the better part of yesterday going over it. I can get a trigger light on ch1 by adjusting the sensitivity of R7246, although it doesn¡¯t stabilize the wave and it stays triggered with the probe detached. Also the trigger ADJ R7224 doesn¡¯t help anything.
I¡¯m very hesitant to reseat U375 or any of the socketed transistors because I understand replacements are difficult to get. In other manuals I¡¯ve seen flowcharts of what to check with yes/no logic to narrow things down. I haven¡¯t come across any like that yet. I¡¯ll check out the Wiki today. Thanks again for any help or suggestions!
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Re: 465 Electrolytic Capacitor Replacement
Bill (?)- wrote on 4/27/2021 12:40 PM: I agree with Stephen. Use enough iron! <much good information omitted> Hello-- Under no circumstances should you use compressed air to clear the molten solder from printed-circuit boards. Chaos ensues. 73-- Brad? AA1IP
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Dan,
Thank you for your well presented message. IMHO this does relate for the reasons you've stated.
I am currently setting up my financial infrastructure to sell, including on eBay. I'm afraid I'll have to use PayPal to enable individual sales. I've dealt with PayPal before when renting out a vacation condo. They did all the nasty things they're known for. Therefore all my dealings will go through an insulated local credit union account.
Thank you for the heads up on eBays changes. I think that actually works better for me, and you've caught me right at the cusp. Now I'm more informed in setting up my accounts.Dave
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On Tuesday, April 27, 2021, 11:32:18 AM PDT, Daniel Koller via groups.io <kaboomdk@...> wrote:
Hi folks, this is OFF TOPIC because it's about e-bay, but on the other hand, with the exception of my older gear, it's just about the only way I get *any* Tek or HP gear these days.? So, with apologies if it drags on too long and in the wrong direction,....
I got a message from e-bay that explains they are changing their payment structure.? ?According to that, sellers will need to directly link a bank account to e-bay so that they can receive payments directly from buyers.? By May 21, if you do not link a bank account to e-bay, they will not allow new postings!? ?So, the implication is that Paypal is no longer going to work.?
I don't know about folks here, but I suspect, like me, they are a bit older, financially conservative, and are loathe to link a personal bank account to e-bay.? ? To this day I do not have my paypal account "linked" to my bank account.? ?I can have all my on-line accounts hacked, but none of them have any access to my bank account.
?One thing I thought to do is open a small credit union account with low/no fees and use that only for e-bay / paypal and keep the balance low, just in case something gets hacked.? ? But now I have to go to the bank, or perhaps open an account on-line.? ?E-bay is NOT making it easier for the small seller.? More and more e-bay is just becoming a venue for cheap Chinese goods and wholesale garbage.
? So, just wondering what folks here plan to do about selling their old gear, and working with ebay in the future.? Anyone have any good Ideas or workarounds to the e-bay problem, or an alternate e-venue for buying and selling old gear?? E-bay has been a collector's and hobbyist's goldmine for 20 years.? It's sad to see it continually changing for the worse.
? ?I am sensitive to the fact that this is a topic only tangentially related to Tek or HP gear, so please keep replies relevant to how e-bay is a conduit for acquiring such gear for us.? ?I'm happy to take replies off-group as well, but if it's relevant, I presume we all want to hear about it.
? Thanks,
? Dan
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
As I understand it, eBay will no longer provide your account information to
the buyer at all. Instead the buyer pays eBay, which acts as an escrow, and
will eventually pay you (or not). The number of payment options would
therefore be independent of the seller's choices.
Personally what irks me more about eBay is that the site is constantly
broken, has years old bugs like items not being added to the watchlist at
times, bids not registering, login loops, aggressive 2FA verification over
and over again, doesn't properly work with Firefox, and has a rather
obscene 11 % tax on top. 10 % would be acceptable, if their site was
top-notch - but it's not, it's half-working garbage at the best of times.
Cheers, Marian
Am Di., 27. Apr. 2021 um 20:32 Uhr schrieb Daniel Koller via groups.io
<kaboomdk@...>:
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Hi folks, this is OFF TOPIC because it's about e-bay, but on the other
hand, with the exception of my older gear, it's just about the only way I
get *any* Tek or HP gear these days. So, with apologies if it drags on too
long and in the wrong direction,....
I got a message from e-bay that explains they are changing their payment
structure. According to that, sellers will need to directly link a bank
account to e-bay so that they can receive payments directly from buyers.
By May 21, if you do not link a bank account to e-bay, they will not allow
new postings! So, the implication is that Paypal is no longer going to
work.
I don't know about folks here, but I suspect, like me, they are a bit
older, financially conservative, and are loathe to link a personal bank
account to e-bay. To this day I do not have my paypal account "linked"
to my bank account. I can have all my on-line accounts hacked, but none
of them have any access to my bank account.
One thing I thought to do is open a small credit union account with
low/no fees and use that only for e-bay / paypal and keep the balance low,
just in case something gets hacked. But now I have to go to the bank, or
perhaps open an account on-line. E-bay is NOT making it easier for the
small seller. More and more e-bay is just becoming a venue for cheap
Chinese goods and wholesale garbage.
So, just wondering what folks here plan to do about selling their old
gear, and working with ebay in the future. Anyone have any good Ideas or
workarounds to the e-bay problem, or an alternate e-venue for buying and
selling old gear? E-bay has been a collector's and hobbyist's goldmine for
20 years. It's sad to see it continually changing for the worse.
I am sensitive to the fact that this is a topic only tangentially
related to Tek or HP gear, so please keep replies relevant to how e-bay is
a conduit for acquiring such gear for us. I'm happy to take replies
off-group as well, but if it's relevant, I presume we all want to hear
about it.
Thanks,
Dan
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
I don¡¯t necessarily see this as a problem. Over here in France, and I think it¡¯s the same within the EU, once the money is in your bank account, there is no way for anyone but yourself to withdraw it without a court order.
No one can have access to anything on any of your bank account(s) without a court order, with the exception of the IRS who can take anything they want without warning if you haven¡¯t paid your taxes.
My PayPal account has been linked to my bank account for years and years, and I¡¯ve never had any problems so far.
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Re: 7603 voltages ok but no trace
I realized that I didn¡¯t see any CRT filament/heater glow in this newer 7603 so I put the working PSU in the other 7603 and in that scope I see the CRT is glowing. I can see a dot on the CRT screen for one second the moment I start it up then it¡¯s gone. Got nothing on the horizontal deflection plates on this other older beat up 7603.
I would really like to get the newer 7603 up and running since it¡¯s in very good shape and if got the readout board which my other 7603 is missing. I¡¯m planning to use my 7L5 (which I was lucky enough to score on eBay recently) in this 7603.
I¡¯ve replaced the CRT in the older 7603 before (it was cracked when I received it) and hoped that was the only problem with it but when it had some other issues and since it was lacking readout option I didn¡¯t spend any more time on it.
Anyone who knows a spot where I could measure the 6,3VAC filament/heater for the CRT? Looks like it¡¯s elevated almost 3kVDC above ground?!
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
On 04/27/2021 02:26 PM, Daniel Koller via groups.io wrote: Hi folks, this is OFF TOPIC because it's about e-bay, but on the other hand, with the exception of my older gear, it's just about the only way I get *any* Tek or HP gear these days. So, with apologies if it drags on too long and in the wrong direction,....
I got a message from e-bay that explains they are changing their payment structure. According to that, sellers will need to directly link a bank account to e-bay so that they can receive payments directly from buyers. By May 21, if you do not link a bank account to e-bay, they will not allow new postings! So, the implication is that Paypal is no longer going to work.
I don't know about folks here, but I suspect, like me, they are a bit older, financially conservative, and are loathe to link a personal bank account to e-bay. To this day I do not have my paypal account "linked" to my bank account. I can have all my on-line accounts hacked, but none of them have any access to my bank account.
One thing I thought to do is open a small credit union account with low/no fees and use that only for e-bay / paypal and keep the balance low, just in case something gets hacked. But now I have to go to the bank, or perhaps open an account on-line. E-bay is NOT making it easier for the small seller. More and more e-bay is just becoming a venue for cheap Chinese goods and wholesale garbage.
So, just wondering what folks here plan to do about selling their old gear, and working with ebay in the future. Anyone have any good Ideas or workarounds to the e-bay problem, or an alternate e-venue for buying and selling old gear? E-bay has been a collector's and hobbyist's goldmine for 20 years. It's sad to see it continually changing for the worse.
I am sensitive to the fact that this is a topic only tangentially related to Tek or HP gear, so please keep replies relevant to how e-bay is a conduit for acquiring such gear for us. I'm happy to take replies off-group as well, but if it's relevant, I presume we all want to hear about it.
Thanks,
Dan This started over a year ago. I don't think that in the end, buyers will no longer be able to use paypal. That would be a dumb move on ebay's part. I couldn't wait to get switched. The only inconvenience I've found was of my own doing and I can change that at any time. I have two bank accounts and my ebay sales go into one and shipping is paid via paypal from the other. I can switch that but it's such a minor inconvenience that I'm not going to worry about. Both accounts are linked to paypal. In the end, as a seller, I get more with managed payments than when the sales went thru paypal. Vince. -- K8ZW
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Ebay sold off PayPal *years* ago so I'm not a bit surprised to see that they've done this. Paypal also (at least used to) required that sellers link their PP accounts to a bank account so I don't see that this is much of a change except that PayPal is no longer the middle man. Early on, PayPal was *notorious* from yanking back payments to sellers and taking the money directly from their bank accounts without warning. I no longer sell on E-bay but I do make many purchases there and I *always* pay for my purchases with a CC so that I have *some* protection. YMMV On Tue, Apr 27, 2021 at 2:32 PM Daniel Koller via groups.io <kaboomdk= [email protected]> wrote: Hi folks, this is OFF TOPIC because it's about e-bay, but on the other
hand, with the exception of my older gear, it's just about the only way I
get *any* Tek or HP gear these days. So, with apologies if it drags on too
long and in the wrong direction,....
I got a message from e-bay that explains they are changing their payment
structure. According to that, sellers will need to directly link a bank
account to e-bay so that they can receive payments directly from buyers.
By May 21, if you do not link a bank account to e-bay, they will not allow
new postings! So, the implication is that Paypal is no longer going to
work.
I don't know about folks here, but I suspect, like me, they are a bit
older, financially conservative, and are loathe to link a personal bank
account to e-bay. To this day I do not have my paypal account "linked"
to my bank account. I can have all my on-line accounts hacked, but none
of them have any access to my bank account.
One thing I thought to do is open a small credit union account with
low/no fees and use that only for e-bay / paypal and keep the balance low,
just in case something gets hacked. But now I have to go to the bank, or
perhaps open an account on-line. E-bay is NOT making it easier for the
small seller. More and more e-bay is just becoming a venue for cheap
Chinese goods and wholesale garbage.
So, just wondering what folks here plan to do about selling their old
gear, and working with ebay in the future. Anyone have any good Ideas or
workarounds to the e-bay problem, or an alternate e-venue for buying and
selling old gear? E-bay has been a collector's and hobbyist's goldmine for
20 years. It's sad to see it continually changing for the worse.
I am sensitive to the fact that this is a topic only tangentially
related to Tek or HP gear, so please keep replies relevant to how e-bay is
a conduit for acquiring such gear for us. I'm happy to take replies
off-group as well, but if it's relevant, I presume we all want to hear
about it.
Thanks,
Dan
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Brokerage accounts such as Fidelity and e-Trade have cash management features with check writing.
For some (I checked e-Trade), no minimum balance is required to open an account. Fees are generally zero (although I don't know about a cash management account with t tiny balance). The checks have routing numbers, just like a bank or credit union and you should be able to set up eBay payments to go directly to the account.
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Re: 7603 voltages ok but no trace
Henric,
I once had a 7603 with a problem intensity circuit. Turned out to be a failed transistor. .
Bob
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
I sell on Ebay and I had no worries linking my account.
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Yes,
i have a separate bank account with just a few hundred dollars. So far no problems.
Bob
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Re: OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Dan,
I find my self in the same boat but I am also well studied in IT security as well. I would set up a separate bank account that is not a (MAIN) account and use that. If you wanted to insulate your Main account even further use a bank account at a different bank. there for no cross access. Also just a side note every time you hand out a paper check the routing number and the bank account number is printed on the bottom. It is less of an issue then is seems.
Eric
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Daniel Koller via groups.io Sent: Tuesday, April 27, 2021 2:26 PM To: TekScopes < [email protected]>; HP Agilent Keysight < [email protected]> Subject: [TekScopes] OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group. Hi folks, this is OFF TOPIC because it's about e-bay, but on the other hand, with the exception of my older gear, it's just about the only way I get *any* Tek or HP gear these days. So, with apologies if it drags on too long and in the wrong direction,.... I got a message from e-bay that explains they are changing their payment structure. According to that, sellers will need to directly link a bank account to e-bay so that they can receive payments directly from buyers. By May 21, if you do not link a bank account to e-bay, they will not allow new postings! So, the implication is that Paypal is no longer going to work. I don't know about folks here, but I suspect, like me, they are a bit older, financially conservative, and are loathe to link a personal bank account to e-bay. To this day I do not have my paypal account "linked" to my bank account. I can have all my on-line accounts hacked, but none of them have any access to my bank account. One thing I thought to do is open a small credit union account with low/no fees and use that only for e-bay / paypal and keep the balance low, just in case something gets hacked. But now I have to go to the bank, or perhaps open an account on-line. E-bay is NOT making it easier for the small seller. More and more e-bay is just becoming a venue for cheap Chinese goods and wholesale garbage. So, just wondering what folks here plan to do about selling their old gear, and working with ebay in the future. Anyone have any good Ideas or workarounds to the e-bay problem, or an alternate e-venue for buying and selling old gear? E-bay has been a collector's and hobbyist's goldmine for 20 years. It's sad to see it continually changing for the worse. I am sensitive to the fact that this is a topic only tangentially related to Tek or HP gear, so please keep replies relevant to how e-bay is a conduit for acquiring such gear for us. I'm happy to take replies off-group as well, but if it's relevant, I presume we all want to hear about it. Thanks, Dan
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OT! OT! --- E-bay fee change -- OT! OT! Cross posted with HP group.
Hi folks, this is OFF TOPIC because it's about e-bay, but on the other hand, with the exception of my older gear, it's just about the only way I get *any* Tek or HP gear these days.? So, with apologies if it drags on too long and in the wrong direction,....
I got a message from e-bay that explains they are changing their payment structure.? ?According to that, sellers will need to directly link a bank account to e-bay so that they can receive payments directly from buyers.? By May 21, if you do not link a bank account to e-bay, they will not allow new postings!? ?So, the implication is that Paypal is no longer going to work.?
I don't know about folks here, but I suspect, like me, they are a bit older, financially conservative, and are loathe to link a personal bank account to e-bay.? ? To this day I do not have my paypal account "linked" to my bank account.? ?I can have all my on-line accounts hacked, but none of them have any access to my bank account.
?One thing I thought to do is open a small credit union account with low/no fees and use that only for e-bay / paypal and keep the balance low, just in case something gets hacked.? ? But now I have to go to the bank, or perhaps open an account on-line.? ?E-bay is NOT making it easier for the small seller.? More and more e-bay is just becoming a venue for cheap Chinese goods and wholesale garbage.
? So, just wondering what folks here plan to do about selling their old gear, and working with ebay in the future.? Anyone have any good Ideas or workarounds to the e-bay problem, or an alternate e-venue for buying and selling old gear?? E-bay has been a collector's and hobbyist's goldmine for 20 years.? It's sad to see it continually changing for the worse.
? ?I am sensitive to the fact that this is a topic only tangentially related to Tek or HP gear, so please keep replies relevant to how e-bay is a conduit for acquiring such gear for us.? ?I'm happy to take replies off-group as well, but if it's relevant, I presume we all want to hear about it.
? Thanks,
? Dan
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Joe
Dave Peterson