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Re: Who made these HV cap kits for the PS2000?
Lead was added to gasoline around 1922, not long after it's discovery, as an easily to add octane.? So any car built after the introduction of the Ford Model T would have used leaded gas. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Saturday, April 6, 2024 at 04:29:17 PM CDT, Richard Knoppow <1oldlens1@...> wrote:
Of course if you want a really low ESR cap don't use an electrolytic. It is possible to obtain fairly high values of capacitance and voltage in plastic film caps. Virtually no ESR. Will they filter better, probably not. I think there is a lot of mythology in general about capacitors of all types. About classic cars: I should look up when lead additives like Ethyl began to be added to gasoline. While lead raises octane it also provides some lubrication to valves. I suspect really old cars were made before leaded gas was common and maybe didn't count on it. On 4/6/2024 1:54 PM, Jim Whartenby via groups.io wrote: Don --
Richard Knoppow Los Angeles WB6KBL SKCC 19998 |
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Re: SR2000 load cap
Thanks Mike, I couldn't remember the name of the tape.? It's a bronze color and very impressive as an insulator. I was going to use it if the cap in the SR2K I'm restoring had a similar problem. 73 dave wa3gin On Sun, Apr 7, 2024 at 9:09?PM Mike Langner <mlangner@...> wrote:
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Re: SR2000 load cap
¿ªÔÆÌåÓýSuggestion ¨C if you can find a very little bit of Kapton tape. Kapton is rated 100's of kV/mm.? I¡¯ve used it in high power (10 kW and above) tube-type FM broadcast transmitters with great success.? It¡¯s inexpensive, and a very thin piece of it should work well for you. ? Mike Langner ? From: [email protected] <[email protected]> On Behalf Of Dave Jordan
Sent: Sunday, April 7, 2024 6:52 PM To: [email protected] Subject: Re: [HallicraftersRadios] SR2000 load cap ? I¡¯ve have some very thin, thinner than bond paper high voltage insulation tape with one side sticky. I think it¡¯s rated at 5kV.? Might be worth a try. I can mail you a few inches if you decide to try it out. It would be better than using carona dope on the plates.? ? Let me know.? ? 73 Dave Wa3gin ? On Sun, Apr 7, 2024 at 8:45?PM W7WRX <clark@...> wrote:
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Re: SR2000 load cap
I¡¯ve have some very thin, thinner than bond paper high voltage insulation tape with one side sticky. I think it¡¯s rated at 5kV.? Might be worth a try. I can mail you a few inches if you decide to try it out. It would be better than using carona dope on the plates.? Let me know.? 73 Dave Wa3gin On Sun, Apr 7, 2024 at 8:45?PM W7WRX <clark@...> wrote: I think I am the only guy in the world that has now spent around 15 hours of his life attempting to FIX the factory cap.? 4 hours today alone. I took it all back apart and hand bent/Straitened EVERY PLATE!!? ?I replaced the bearings, then sat with magnifiers and a flashlight and adjusted each plate by hand.?? |
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Re: HT-44 noise on microphone input
On Sat, Apr 6, 2024 at 02:08 PM, Richard Knoppow wrote:
What is the nature of this noise, describe please.Yes, regular? old unbalanced high impedance mic line using 1/8" coax (RG-172?)? This HT-44 was clearly stock with no mods and the coax mic line is grounded at one end only (at the tube end, 15" from the mic connector).? ?The HT-44 uses a two pin mic connector with one pin being the not mic lead and the other pin being the PTT line.? The external mic shield is connected to the spring in tne connector and a setscrew bears down on the spring, creating a questionable ground connection.? But, during my testing there is no mic connected at all.? The "noise" I'm hearing is a sound similar to what you might hear with a bad ground on a performance audio system.? On a spectrum scope, it appears as a series of vertical lines across the selected sideband, and vertical lines of a lesser amplitude on the opposite or suppressed sideband.? I've not measured the spacing between the vertical lines,? but it's on the order of every 10-15 Hz.? The internal mic coax with one end grounded runs to the rear of the chassis to the first mic amp, then to the mic gain control on the front panel and back to the rear of the chassis through another piece of ooax with one end ungrounded.? From an electronic standpoint, not a very wise design.? I could disconnect these three pieces of mic coax one at a time to see if the garbage is being picked up by one of more of them.?? 73, Floyd - K8AC |
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Re: Who made these HV cap kits for the PS2000?
¿ªÔÆÌåÓýJim, ??re: ¡° to preserve¡± ¡ESR? ¡etc To preserve to me means to protect or maintain an item so that it is useful.? preserve ??.. From some dictionary : to keep safe from injury, harm, or destruction ????? : to keep or save from decomposition? : to keep up and reserve for personal or special use ?? ?I think that car collectors have no problem using unleaded gas or a blended motor oil (or a synthetic) as opposed to what was originally specified in the owner's guide. beyond me ? Replacing a 5Y3 only requires one to pull the tube and insert an octal plug with two rectifiers soldered in using a salvaged tube base.? Easily undone and it removes a lot of unneeded heat.?? I guess maybe but that is another topic ? As for low ESR filter capacitors, they were not a concern back when these radios were designed.?Yes ?I don't understand why ESR would be of concern now. Yes for old rigs. ? Any new, brand name, electrolytic capacitor is superior ?to what was available back in the day ?yes as regards ESR, but we can talk about their real-world life in another 20,30,40,50,60 years? Paying a premium for a low ESR filter capacitor that does nothing to improve performance makes little sense to me.??Yes, almost, but the IR drop should not be completely forgotten, and a premium might give you a better cap in other respects ? I am more prone to use new much smaller radial electrolytic caps under the chassis and leave the old aluminum can filter capacitor unconnected and used as a place holder.? ? ?Well, that is one reasonable approach. ?At some point, most likely a cap fails totally or is on the verge. If you want it to be more than a ¡°never on looker¡± the original guts need to be disconnected ?.. agreed I guess. ?Now you need an electrical replacement. Even with a lot of work, a true OEM replacement that works probably can¡¯t be found and slowly reformed etc [but it might not be impossible ], and it seems like you have often ?done that, I think. But most likely, people will go to one of the well-known procedures, which is a function of the desire to have an original ¡°looker¡± ---outside, inside, and under. It also depends on your tools, stock of repair stuff, your dexterity, your curiosity. And then there is ?the long term gratification/pride? received [no word for this], and past similar jobs that worked out. So, there is no one size fits all, IMO? ? Perhaps deceitful but no one is the wiser since the average Joe would not notice any difference while he enjoys an old working radio. Jim. your phrase ?¡°Perhaps deceitful¡± ??is a very interesting. I would say it is not deceiving others as long as you don¡¯t hide the fact, it is a reasonable compromise in replacing like with like under the situation. But you might feel it is deceiving, and run around with that bothering you[me]¡ or not. ?Doesn¡¯t it depend on how you think of your own workmanship, and what you expect of yourself? {¡°you¡± is the generalized you}, and I would suggest, if you think you could have done a better job under the situation, maybe it will nag at you when you go to sleep, but if you feel satisfied with your job, you can leave it and be free. ?I/we wont be any the wiser or lose sleep.? ? OMG, where am I? ? ?
-- don??? va3drl |
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Re: Seen at the Raleigh Hamfest today
Don There is a link below the photo to the rest of the items at the 'fest. Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Saturday, April 6, 2024 at 04:31:51 PM CDT, don Root <drootofallevil@...> wrote:
Jim, Well ?how did you get the picture?? you are just teasing us, and trying to make us envious! ?
? -- don??? va3drl |
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Re: Seen at the Raleigh Hamfest today
Don Not mine!? I stayed home in Arkansas and didn't make the trip to North Carolina.? My oldest halli is a 5T that I got for $5 at a hamfest many years ago. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Saturday, April 6, 2024 at 03:44:11 PM CDT, don Root <drootofallevil@...> wrote:
Jim, Good look¡¯n oldie. Is it upstairs or downstairs now? Looks just like Dachis¡¯s SX-9 late, but the toggle switch on/off positions have changed! ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Saturday, April 6, 2024 4:16 PM To: HALLI IO GROUP Subject: [HallicraftersRadios] Seen at the Raleigh Hamfest today ?
Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
-- don??? va3drl |
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Re: Who made these HV cap kits for the PS2000?
Don To preserve to me means to protect or maintain an item so that it is useful.? I think that car collectors have no problem using unleaded gas or a blended motor oil (or a synthetic) as opposed to what was originally specified in the owner's guide. Replacing a 5Y3 only requires one to pull the tube and insert an octal plug with two rectifiers soldered in using a salvaged tube base.? Easily undone and it removes a lot of unneeded heat.?? As for low ESR filter capacitors, they were not a concern back when these radios were designed.? I don't understand why ESR would be of concern now.? Any new, brand name, electrolytic capacitor is superior to what was available back in the day.? Paying a premium for a low ESR filter capacitor that does nothing to improve performance makes little sense to me.?? I am more prone to use new much smaller radial electrolytic caps under the chassis and leave the old aluminum can filter capacitor unconnected and used as a place holder.? Perhaps deceitful but no one is the wiser since the average Joe would not notice any difference while he enjoys an old working radio. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Saturday, April 6, 2024 at 01:50:06 PM CDT, don Root <drootofallevil@...> wrote:
Jim, ?yes, well mostly! ?and I cannot find real fault with what you said, unless I quibble. I was only responding to the idea of ¡°best¡± ?ESR, and then drifted of course.. a little The second topic of modifying/upgrading depends mostly on whether you are wanting to preserve or not. For such a rig, as a SR2000, many people want to operate and also mostly preserve, while reducing problems inherent in designs of the time. In this case there is no end to how many mods there might be. I got into old radios just to save may father¡¯s 1930¡¯s SW radios, one with a magic eye, and ¡¡¡¡¡! So I tend to want to preserve.
? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Saturday, April 6, 2024 3:02 AM To: [email protected] Subject: Re: [HallicraftersRadios] Who made these HV cap kits for the PS2000? ? Don Too much is attributed to ESR in boat anchor radio power supplies.? It is a red herring from my point of view.?? ? If a low ESR capacitor was not specified in the radio's part list than just how much does it really matter?? ESR causes an IR loss that heats the filter capacitor.? The aluminum can filter cap has a lot of surface area which helps to cool it.? Even a 5 ohm ESR will add less then half a watt of average heat to the filter capacitor.? The 10 watts of heater power dissipated by a 5Y3 rectifier sitting adjacent to an aluminum can filter capacitor will do more heat damage then the 5 ohms of ESR. ? If one replaces the 5Y3 with two silicon diodes, at least 13 watts of heat is eliminated.? So the power transformer doesn't have to work as hard, the aluminum can filter capacitor runs cooler but B+ is perhaps 5 to 10% higher.? ?A typical tube is dissipating perhaps 3 watts from the heater power and IR drop.? Increasing that 3 watts by 10% due to a higher B+ voltage will be hardly noticed.?? ? The higher B+ may cause a 10 tube radio to dissipate an additional 3 watts.? Solid stating the rectifier has eliminated perhaps 13 watts.? The net loss in heat is still 10 watts.? With less heat, the radio works fine and lasts a long time. ? Does this make sense to you? Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy ? ? On Friday, April 5, 2024 at 06:28:03 PM CDT, don Root <drootofallevil@...> wrote: ? ? Hi Jim, I am behind and trying to catch-up, and you triggered my latent thoughts about ESR stuff As regards the previous comments about? one or the other, it seems to me the ¡°better¡± or the ¡°best¡± one ?is the one with the lesser ESR, at least in that case.? ?¡°Better¡± ?and ¡°best¡± ?are always comparative. ?????The best score in golf is a bit different than the best score in basket ball. ? ? If there is an ultimate/ ideal Best ,for ESR, ?some might say it is zero .. but hold on, now the series inductance won¡¯t be swamped by resistance, so should include the ESL ?????when you squeeze the R out of caps and the R out of L¡¯s , circuit Q¡¯s get high ?and ringing can easily take place? . my guess is that 1960¡¯s power supplies will be stiffer and stiffer as you squeeze out the series part of the ESR, but ?most reasonable leakage in ?the ESR value will hardly matter. But when it comes to switching PS, it is rather obvious that series R is going to produce heat etc and removing series R ??might cause ringing. I leave that to gen X, Y, Z, and W, to worry about that?? ??? but ?whe you generalize, and consider RF circuits, sticking in a new cap with very low ESR might be enough to allow spurious resonances to show up as ringing. They rarely if even spoke the ESR, series resistance, or even leakage AFIK .. ??which is 1/Googolplex of what I should know. ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io ? How does one know if the ESR is the "best value" when the actual filter capacitor ESR is not specified by either Hayseed, hallicrafters or any of the original capacitor suppliers?? I can see the need for low ESR capacitors in some power supply applications where the capacitor is completely discharged in one cycle like the capacitors found in parallel gap welders, for example.? ? ? Just how hot are these filter capacitors getting above ambient temperature from internal heating, during normal operation? Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy ? ? On Thursday, April 4, 2024 at 09:32:51 PM CDT, Dave Jordan <wa3gin@...> wrote: ? ? Nice looking craftsmanship.?? ? Here is a ham owned cap company that has been around for a long time and produces some of the best cap kits for our hobby.? ?t As well some of the best ESR values for electrolytics?used in our boat anchor power supplies. For those of you not familiar with the term ESR. Here is a brief definition: Equivalent series resistance?(ESR), also known as internal resistance, is a value representing the loss of useful energy in a simple electronic circuit consisting of a resistor and an ideal (perfect) capacitor. Technically speaking, the energy is not lost but is usually dissipated as undesirable heat. For those curious about this spec there is plenty of good reading on the?internet.? ? ? ? 73 Dave ? On Thu, Apr 4, 2024 at 9:43?PM N6UH <iandavisgl1000@...> wrote:
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Re: Seen at the Raleigh Hamfest today
¿ªÔÆÌåÓýJim, Good look¡¯n oldie. Is it upstairs or downstairs now? Looks just like Dachis¡¯s SX-9 late, but the toggle switch on/off positions have changed! ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Saturday, April 6, 2024 4:16 PM To: HALLI IO GROUP Subject: [HallicraftersRadios] Seen at the Raleigh Hamfest today ?
Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
-- don??? va3drl |
Jim Whartenby
Dave Jordan
Bruce Collins
Mike Langner
Floyd - K8AC
don Root