Re: Tek VAR Pot Repair Rings
Jim Adney
On Wed, Oct 20, 2021 at 01:55 PM, snapdiode wrote:
What's the timeframe for getting back to you with a commitment?I don't have any timeframe in mind, but the machine shop predicted a lead time of 5-6 weeks. They must be busy. I don't plan to place an order for these until I've got enough commitments to get me close to 150 pieces. I won't ask for prepayment, but I won't object if someone offers to make one. Take your time, but I hope this doesn't get dragged out too long.
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Re: Replacement caps for DC 505A
Blame it on me: I wasn't doing a proper job of searching Mouser. Not even sure what I did to get only two results. Using Mark Vincent's search as a start point I found the variety of Vishay axial capacitors. Looks like the 125 ALS line 6800uF cap is a good fit.
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Still good to get thoughts and ideas from others. I'm still a newbie at capacitor selection, so don't completely trust myself.
On Wednesday, October 20, 2021, 05:29:02 PM PDT, Jeff Dutky <jeff.dutky@gmail.com> wrote:
Dave, How close are the mechanical tolerances? The highest values for each voltage range (e.g. 6800 uF @ 16 V) is only 21mm in diameter. Would that still fit in the space? Otherwise, my (relatively ignorant) understanding is that 4700 uF is today's equivalent to 5000 uF from the 1970s. Also, you are not designing this to be manufactured in bulk. If you order several more caps than you need you can select for highest capacitance, and not have to worry that the parts might be 20% below spec. You might get lucky and get a couple of parts that are 10% above spec. -- Jeff Dutky
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Re: Tek VAR Pot Repair Rings
Jim,
After I committed to only 10 rings, I did a more thorough survey of my letter and 1-series collection, and I would like to increase my order to 20 rings. Almost every plug-in in my collection has these pots, but I had not noticed because many of them are not showing any symptoms of failure, and I had (obviously) not investigated pots whose knobs were not slipping. -- Jeff Dutky
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Re: Tek VAR Pot Repair Rings
Dave Casey
For anyone needing more than just a repair ring, I have a handful of NOS
Tek Made pots in this style. Send your part number requests and I'll see what I have. Dave Casey On Wed, Oct 20, 2021 at 1:55 PM snapdiode via groups.io <snapdiode= yahoo.com@groups.io> wrote: That is *very* interesting and timely for my collection. What's the
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Re: Replacement caps for DC 505A
Dave,
How close are the mechanical tolerances? The highest values for each voltage range (e.g. 6800 uF @ 16 V) is only 21mm in diameter. Would that still fit in the space? Otherwise, my (relatively ignorant) understanding is that 4700 uF is today's equivalent to 5000 uF from the 1970s. Also, you are not designing this to be manufactured in bulk. If you order several more caps than you need you can select for highest capacitance, and not have to worry that the parts might be 20% below spec. You might get lucky and get a couple of parts that are 10% above spec. -- Jeff Dutky
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Re: USPS shipments comments
Roy Thistle
On Mon, Oct 18, 2021 at 11:57 PM, Jean-Paul wrote:
I can see, sort of, if there's an old label with a bar code, or a bar code printed on the box. I remove those, or black them out, with a marker. I'm not so sure why it should matter... particularly with printing or writing on the box... since the "post office" uses a particular bar code, which ought to be fairly unique. The sorting machines are supposed to scan for the U.S.P.S. label on the box. If the "postman" sends your plugins back to Kimberly-Clark because you posted them in a Huggies box, with a U.S.P.S. label on it... well... it's just another day at the post office: right? -- Roy Thistle
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Re: USPS shipments comments
Roy Thistle
On Mon, Oct 18, 2021 at 11:57 PM, Jean-Paul wrote:
Here in the colonies, we sometimes use Dead Ex... did I spell that wrong? (Highly talented in the arts of package contents destruction, they can fatally break stuff in any package just by accepting it for shipment.) The only individuals I know that are faster than Ursain Bolt, at least on the 50 meter dash, are courier drivers that drop-deliver packages to residential. (And yes! They really do drop the package, when they deliver it.) -- Roy Thistle
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Re: USPS shipments comments
maurit
I am Italian an electronic hobbyist.
In 20 years, with eBay sales, I have shipped more than 2500 packages around the world. From what I have read on this topic I have understood that "the whole world is a country". I sympathize with you but unfortunately we are helpless victims. I use Poste Italiane to send, to receive from the USA I ask for USPS. I rarely use private couriers, only with eBay with their "shipping manager" and if it's convenient. In any case: Bomb-proof packaging !!!
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Re: Replacement caps for DC 505A
Mark Vincent
Dave,
Take one lead and bend it so it goes in one hole. The other lead bend it so it is over or under, under if the bare wire does not touch other traces. Then use a solid wire as the extension to the other hole. the solid wire keeps the body stiffer and reduces movement. Wire spaghetti can be put on the wire for insulation. An adhesive between the can and board can be used to further secure it. I have done this axial to radial conversion before. Mark
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Re: Replacement caps for DC 505A
That looks pretty good!
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I've been studying Vishay's website, and the 500D series was looking promising, but couldn't find the right size available for sale. It's been kind of maddening how this particular size seems to skirt the boundaries of availability. I keep getting close, but then the series/size combos that would work turn out to be the ones that aren't available. I guess I was excluding things below 5000uF. Do you think it's ok being 300uF below nominal? The book calls for +75%, -10%, so as low as 4500uF. Obviously it would depend on what actually got delivered. A 4700uF 20% low would be only 3760uF. I suspect they come a bit closer to nominal than the extreme ends of spec. Looking at the datasheet for the Vishay 120 ATC looks like the lead length is enough to span the trace distances. It's something to contemplate. The frustrations with the axial availability is leading me to reconsider the Nichicon UHE. I think it's a better capacitor, and the need to run a jumper is really a small aesthetic thing only. Wouldn't I prefer a better cap over aesthetics? I guess I'd need to consider physical mounting as well - a radial would require something to hold it in place. The axial would be lead mounted. But long leads (the 120 ATC means lead lengths of about 20mm + 1 radius ~= 30mm) seems a bit flimsy as well. Thanks for the research and inputs Mark.
On Wednesday, October 20, 2021, 12:50:53 PM PDT, Mark Vincent <orangeglowaudio@gmail.com> wrote:
Dave, Will this Vishay work? https://www.mouser.com/c/passive-components/capacitors/aluminum-electrolytic-capacitors/aluminum-electrolytic-capacitors-axial-leaded/?q=axial%20capacitor&capacitance=4700%20uF&product=High%20Temp%20Electrolytic%20Capacitors&termination%20style=Axial&voltage%20rating%20dc=16%20VDC&instock=y Mark
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Re: Replacement caps for DC 505A
Mark Vincent
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Re: USPS shipments comments
Merchison Burke
No only did your friend, with the camera, get punched in the face but he got punched in the stomach and kicked in the groin as well. Not that I approve, but I can see why some people turn to the gun to settle their grievances.
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On 2021-10-20 10:39 a.m., stevenhorii wrote:
I once picked up a Project Mercury horizon scanner from a surplus dealer in
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Re: Tek VAR Pot Repair Rings
snapdiode <snapdiode@...>
That is very interesting and timely for my collection. What's the timeframe for getting back to you with a commitment? I need to examine 20 plugins ... And do you need a deposit or 100% upfront?
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Re: USPS shipments comments
stevenhorii
I once picked up a Project Mercury horizon scanner from a surplus dealer in
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Los Angeles. I was headed home and already had a lot of stuff that I was taking back as baggage, so I decided to ship it. I put my address on the instrument, packed it using the star-shaped cutout foam that the US Military uses for shipping aircraft instruments, and put an address label on that box. Then the box went into a larger box that allowed for two-inches (about 5 cm) of foam around all sides. It was a new box, no old labels or printing on it. Address label on it, covered the label with clear tape, and took it to the local UPS. I had used them before and they had a sign that said “Pack for a four-foot drop onto concrete”. My package would meet that spec. When they weighed it, they told me “There will be a surcharge for this package. It is too large for the weight”. I pointed to their sign and said that I packed it to meet that suggestion. They would not relent so it was an extra $10 (this was back in the ‘90s). I can understand why they do this - packages like this take up more space in their trucks or air freight containers so it winds up being less economical for them. Still to get charged extra to meet their suggested packing was irritating. If you don’t know already, FedEx Ground in the US is different from FedEx Express. The Ground service uses independent contractors, though the US Labor folks decided that they are employees so FedEx had to adjust their policies for that. Still, it means for far more variability among the drivers. I have had packages that arrived very clean and with little evidence that they had been shipped at all. Others arrived like they had been dropped onto concrete - from far more than four feet - and then drop-kicked into and out of the truck. The reason for putting address labels on everything is that a friend of mine shipped a fairly large camera and the person who bought it got an empty box with one side torn open. UPS denied the claim since it was “inadequately packed”. Then they said there was no way they could get it to the destination even if they could find it because there was no label on the camera. It would eventually wind up for sale in an “unclaimed freight” auction. My friend had to refund the cost to the buyer so he lost out twice - what he paid for the camera and then refunding the purchase price to the buyer. Well, and the shipping cost as well. Oh, and he had the camera packed by a company that packs and ships stuff, he did not do it himself. He also lost out on the packing cost. The packer/shipper said he always packs to UPS standards so he would not refund the packing cost. Back to the USPS thread. I have a jeweler in Chicago that does custom work. I have her design something when I need a gift for my wife. We talked about shipping. She almost exclusively uses USPS. Why? It is a theft deterrent. If a package is stolen from UPS or FedEx, depending on the value, it’s a crime but subject to civil law. If a package is stolen from the USPS, it is a Federal crime (well, depending to some extent on the value - but we’re talking jewelry here) so a thief might think twice before stealing a USPS package. She said that most of her jeweler friends do the same thing. They will all use FedEx Express if requested and they insure the packages and require a signature on delivery. But this is also for jewelry - generally small and light, not a 50-pound Tek scope.
On Wed, Oct 20, 2021 at 02:32 John Parkins G8KVP <john@g8kvp.com> wrote:
Hello All,
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Re: USPS shipments comments
Jim Ford
Wasn't there a Dilbert strip like that where the company provided beer for the employees to loosen things up? They ended up jousting with the forklifts in the warehouse! Jim Ford Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Ken Eckert <eckertkp@gmail.com> Date: 10/20/21 8:51 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] USPS shipments comments My wife worked for a while in a BC Liquour control board warehouse, guys would drive the forks into a pallet just for a giggle............
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Re: USPS shipments comments
Brad Thompson
Ken Eckert wrote on 10/20/2021 11:51 AM:
My wife worked for a while in a BC Liquour control board warehouse, guys would drive the forks into a pallet just for a giggle............Hello-- I worked for an industrial-robot startup-- some systems were sold to auto manufacturers and occasional accidents [sic] would take place in which a forklift tine went through a CRT display screen. They're out there, folks.... 73-- Brad AA1IP
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Re: USPS shipments comments
Ken Eckert
My wife worked for a while in a BC Liquour control board warehouse, guys would drive the forks into a pallet just for a giggle............
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Re: 454A cover and mesh CRT screen
Roy Thistle
Hi Radeng:
Where abouts in Africa are you? They tell me it's a big place! (Apologies if you not in Africa... but, that's my best guess as to where your to.) Cheers -- Roy Thistle
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Re: USPS shipments comments
Paul Amaranth
It's all over.
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I had 3 pallets of solar cells delivered and there was a 20% breakage rate (glass smashed, frames bent). I think they dropped one pallet off a loading dock. About the only thing they didn't do was run a forklift straight through the box. Paul
On Wed, Oct 20, 2021 at 08:26:09AM -0700, Ken Eckert wrote:
I had a very light meter, Huntron Tracker, that I shipped via Canada Post/USPS. The meter arrived with the back of case smashed and a damaged PCB. The box was totally stove in on one side. After much, much hassle (and not helped by an uncooperative recipient) Canada Post coughed up a partial refund on the shipment. And that was with complete documentation. --
Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@AuroraGrp.Com | Unix/Linux - We don't do windows
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Tek VAR Pot Repair Rings
Jim Adney
I'm starting a new thread for these, in the hope that others will see this and respond. I've proposed getting 150 of these "Adney Rings" made by a local machine shop. I have to buy that many in order to get the price down to where I can resell them for $5 each, plus postage. These rings repair Tek-made VAR pots where the set screw attachment to the 1/16" shaft has cracked and no longer holds onto the shaft. This failure seems to be fairly common in the plugins where these pots were used. It appears that they were used in Letter Series, 1-Series, 2-Series, 70-Series, and 3-Series plugins. I'd love to hear that they were also used in later plugins. Please comment if you have corrections or additions. There's photos here, in case you don't remember what I'm talking about:
https://groups.io/g/TekScopes/photo/262268/3196738 Future Adney Rings will come with slightly shorter SST set screws, which may be easier to install and less likely to snag nearby wiring. So far I have the following commitments to buy "Adney" rings: J. D.: 10 rings, $5 x 10 + $8 shipping = $58 D. W.: 10 rings, $5 x 10 + $8 shipping = $58 S. M.: 20 rings, $5 x 20 + $8 shipping = $108 M. V.: 10 rings, $5 x 10 + $8 shipping = $58 I'd be happy to hold on to 20 more, which is more than I'll ever use, so that brings us up to a total of 70 rings. Unfortunately, that's still less than half the preorders I need to get my cost down to the point where I can add the SST set screw and sell them for $5 each. That means that they will have to cost much more than $5 each, or other people need to step up and commit to some now, rather than waiting until later. Note that if I decide to hold on to a bunch of these myself, in order to keep the price down now, the future price is sure to go up. Anyone else out there willing to raise their hand now? As Jeff said, "best to have and not need than to need and not have." FYI, the machine shop quote I have has expired. I'm assuming they will stick to it for longer than the original time, but that's not assured. No one is committed until all my ducks are in a row. I'll let everyone know if/when this happens. thanks for reading,
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