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Re: HT-45 Loudenboomer Value?
Looks great to me.? Does what it was designed to do, nothing more and nothing less! It's a keeper if you are a collector. 73 dave wa3gin On Thu, May 9, 2024 at 3:38?PM Bill (Group Owner) via <k2wh=[email protected]> wrote: Yes, I concur, very nice looking amp, kinda looks "Used very little". |
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Re: HT-45 Loudenboomer Value?
I have one of those! They're great amplifiers but are only good for about 500-600W You can put a 3-500 in them.? If it's the slightly shorter Eimac model, it will fit. The newer (taller) imported 3-500's will not. The original (roughly 3000V) power supply must be connected to the amp before testing it because the swinging choke will not "swing" unless the current output is at least 55mA? That 55mA comes from the 210K bleeder resistors, (approx 15 mA) and stand-by idling current (approx 40mA) Without the minimum current draw, the voltage will literally "soar" to around 4000-4500V. I built a power supply to eliminate the old mercury vapor rectifiers, filament transformer and swinging choke using a Drake plate transformer out of an L-4B using the same voltage doubling circuit. It produces around 2600V.? The amp with the original 3-400 does around 500W. Above it's wired for 120AC.? I have subsequently re-wired it for 240. If your amp works ok and is in otherwise good condition, I would think it's worth around $600-750. If you try to sell it untested (meaning it really doesn't work)?? I wouldn't give more than around $300-400 for it. ymmv -- 73/Rick W4XA __________________________________ All posts are created using OpenSuSE Leap 15.5 x64 Linux |
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Re: Sprague capacitors variants
¿ªÔÆÌåÓýJim, from a month ago? responding to that guitar site ?¡°I've found this site awhile ago.? No dates are shown for the ads or for the data sheets¡±.?? The first ad/data sheet ?likely comes from¡. ?? pdf 11 ==== same vert [red] line? but? missing? some image areas === ?
? Or maybe¡.. ????????????? ? pdf? 48
From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Tuesday, April 30, 2024 1:02 PM To: [email protected] Subject: Re: [HallicraftersRadios] Sprague capacitors variants ? Richard I've found this site awhile ago.? No dates are shown for the ads or for the data sheets.?? ?
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? -- don??? va3drl |
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Re: HT-45 Loudenboomer Value?
Nice looking amp.? Value hmmm,? Tell your wife it is worth a dollar a watt!? Tell your neighbor it is $2 a watt. Tell the collector it is $5 a watt. It should clean up nicely. Enjoy dave wa3gin On Thu, May 9, 2024 at 10:06?AM Terry ONeill via <cpa599=[email protected]> wrote: I inherited an ?HT-45 Loudenboomer with the single 3-400. It appears to be in good physical condition but is untested by me. |
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Re: Looking for a choke for an SX-16 PN: C1003, CLI on schematic (MB CL1)
Larry I have chokes of various physical sizes and values.? The tube manuals indicate a minimum of 3 Henries.? I assume that about 10 Henries will be good enough??? Can you give me a center to center mounting hole spacing and an idea of how tall the choke is?? I can then go through the stash to see what is available that will fit the dimensions you give. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, May 5, 2024 at 07:16:53 PM CDT, Larry Tusoni W6YH <larry@...> wrote:
I am looking for a choke for an SX-16 PN: C1003, CLI on schematic (MB CL1). Either an original or replacement. 73, de Larry, W6YH |
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Re: SR2000 and P2000 restoration continues
¿ªÔÆÌåÓýJim,? I agree with ¡°will reform at the lower voltage¡± ,?? ?It was the ?¡°yield less capacitance¡± that is new to me! You don¡¯t say if you agree with that or not, but go onto more detail with ¡°voltage across¡± rather than speak about the reformed voltage implied by Walt. ?One of these days I will have to restudy the ¡°and yield less capacitance¡± point as stated by Walt. Thanks for your statements. ??They are consistent with my simple recollection. ?
? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Saturday, May 4, 2024 11:19 PM To: [email protected] Subject: Re: [HallicraftersRadios] SR2000 and P2000 restoration continues ? Walt said: ? ?A capacitor that is run at less than its specified voltage will reform at the lower voltage* and yield less capacitance**. ? *I agree with this statement, at a lower working voltage, the dielectric will reform to that lower working voltage.? But the capacitor is still capable of being reformed to operate at the originally rated standoff voltage. **Voltage across the capacitor has no affect on capacitance, the operating voltage is not in the formula used to solve for capacitance, that formula is simply plate surface area divided by plate separation. ? An aluminum electrolytic capacitor will maintain the same capacitance at any voltage below it's rated withstanding voltage.? The thickness of the dielectric, the insulator made by oxidation of the etched aluminum surface, also determines the withstanding voltage.? This oxide will deteriorate over time and allow a leakage current to flow.? This is what the reforming process corrects.?? ? The electrolyte is the "second plate" of the capacitor, not the second piece of aluminum foil.? Being a paste, it will conform to the etched oxidated surface of the primary aluminum foil.? The second aluminum foil is there only to make contact with the electrolyte.? Since both the second aluminum plate and the electrolyte are at the same relative potential, there is no capacitance between them.? But it is a lossy electrode so there is a resistance associated with the electrolyte & foil pair, aka ESR. ? Don, if the two references below did not answer your questions, then perhaps an internet search will find a explanation to your liking for how aluminum electrolytic capacitors work. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy ? ? On Saturday, May 4, 2024 at 08:29:12 PM CDT, don Root <drootofallevil@...> wrote: ? ? Jim? I am now confused about just what has been in question. Your comments seem good, but don¡¯t seem to address Walt¡¯s comments.IMO of course. What Walt seems to be suggesting is new to me. I would like to see that clarified for us hard of hearing guys, ?and maybe see an authentic source of that thinking so I can repeat it with some confidence. ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io ? Electrolytic has to do with the flow of current through a liquid, nothing more.? What we now know as an electrolytic capacitor started out as a detector?in early days of radio and?as a means of changing AC to DC. See:?? ? The insulating material, the dielectric, in an aluminum electrolytic capacitor is aluminum oxide.? The electrolyte serves as a connection on the far side of that oxide.? ?The electrolyte conforms to all of the nooks and crannies of the oxidized aluminum sheet that was etched to increase the surface area.? So the conductors in an aluminum electrolytic capacitor are the etched aluminum and the electrolyte.? Between these two conductors is the aluminum oxide.? The second aluminum sheet is a means to connect the electrolyte to the capacitor terminal.? See: ? Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy ? ? On Saturday, May 4, 2024 at 02:29:39 PM CDT, waltcates <cateswa@...> wrote: ? ? We were talking about the working voltage of electrolytics. The applied voltage on an electrolytic capacitor does in fact affect?the dielectric constant of the capacitor. Hense the name "Electrolytic". ? ? Walt Cates, WD0GOF ? A majority of acceptance is not proof of correctness. ? From: [email protected] <[email protected]> on behalf of Jim Whartenby via groups.io <old_radio@...> ? AFAIK, withstanding voltage has little to no affect on capacitance.? Capacitance is plate area vs dielectric thickness.? I have seen capacitors test within their capacitance tolerance but fail for withstanding voltage way below the rated value. ? If the dielectric reforms to a lower withstanding voltage, would not the dielectric be thinner?? A thinner dielectric would indicate a higher capacitance, would it not? Regards, Jim ? Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy ? ? On Saturday, May 4, 2024 at 12:47:32 PM CDT, W7WRX <clark@...> wrote: ? ? Good point ? This particular Dual section FT Germany cap is rated at 450 working voltage for 34,000 hours.? It states your allowed 500 volts 5 x a minute.? I think that is the standard greater than 315 volt x 1.1 spec for surge. I think I will install it on a terminal strip. The can cap is dated 1967.?? ? These are floating voltages.? When keyed these of course all drop down.? I wouldn't let the rig sit on high for long periods of time anyways.? I run it on low 99 percent of the time. ? C ? C ? On May 4, 2024 10:22 AM, "waltcates via groups.io" <cateswa@...> wrote: One thing to remember about electrolytic capacitors; A capacitor rated at Xuf at Yvolts means that at at Yvolts it will react as a X value capacitor. The max voltage on the capacitor is another spec. ? A capacitor that is run at less than its specified voltage will reform at the lower voltage and yield less capacitance. ? ? ? ? ? Walt Cates, WD0GOF ? A majority of acceptance is not proof of correctness. ? From: [email protected] <[email protected]> on behalf of W7WRX <clark@...> ? The SR2000 is working great now with thr offset fox in place.? ?Today was time to go through the P2000
-- don??? va3drl |
Dave Jordan
Rick W7IMM
Bill (Group Owner)
don Root
Jim Whartenby