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Re: S-41G or W or Echophone EC-1A good picture of dial face
开云体育Ray, Probably any original scales have ?similar problems? So someone would have to somehow reproduce the exact scale “paint scheme layout”. You did not mention any, scars, chipping, flaking; just fading so a well-diffused lit dead on photo [or a photo scanner] should capture all the printed details. That should leave only the “white” background to think about. So was the original 100% white or 98% ,90% or much less [who knows now]. Then there is the amount gloss, or semi-gloss, or matt ?to decide on. My though, from memory is scale backgrounds are not very glossy.. but that might depend on the intended illumination. However somebody may have done this already for the S-41, and at least have the exact prescription for the black markings. ?? I have one somewhere in hidden deep storage, but mine is a G, not a W. Remember to keep records, as we might be asking for advice once you are done. ? -- don??? va3drl |
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S-41G or W or Echophone EC-1A good picture of dial face
开云体育Never have found a source yet for a replacement dial face for my S41G. This receiver works good and is in excellent physical condition except for the faded dial face.I wonder if anyone has a S41"W" model (white dial), or the Echophone EC-1 with a good dial face that could be photographed such that I could make a new dial face from an emailed attached photo? It's not a premium radio of the past, but is in good enough condition to try to improve the dial face. I also have a good S-20R and a SX101 and a number of other "golden oldies" to go with my "rice boxes". Your assistance would be appreciated. Ray, W4BYG -- "The world is desperate for a faith that combines two things: awestruck sight of unshakable divine Truth, and utterly practical, round-the-clock power to make a liberating difference in life"... John Piper |
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Re: HT-44 Common Problem?
Yep - I read your document on the issues you ran across before starting any work on my receiver.? Oddly, all other resistors in my receiver were well within tolerance.? The guy I bought it from told me that he didn't think the SX-117 or HT-44 had ever been used.??
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73, Floyd |
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HT-44/SX-117 CW Offset Solution
I've finished testing my modification for providing a CW offset when running the HT-44 and SX-117 in transceive mode under control of the receiver VFO.? This is a "no-holes" modification that's inexpensive to implement and provides true CW transceive operation.? In other words, with your slide switch in XCVR position, you can tune the receiver to a station and call him and you'll be zero beat with him (or very nearly).? Without the modification, using transceive mode on CW is useless as calling a station you hear results in you being off his frequency by a difference equal to the frequency of the tone you're listening to.? The circuitry resides on a small board mounted near the VFO capacitor leads under the SX-117 chassis.? A cable between the HT-44 octal plug and the RCA jack labeled ANT on the SX-117 connects the circuit to a N/O relay contact in the HT-44.? When the HT-44 goes to transmit, the relay causes the SX-117 VFO offset to occur.
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The mod does not affect the stability of the VFO and is easily removed.? When operating SSB in transceive mode, you unplug the cable mentioned above and then the offset does not occur.? Schematic follows.? Probably unreadable and no way to increase the size here, so if interested, let me know and I'll email it to you.
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73, Floyd - K8AC
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Re: CW Sidetone ideas
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From: [email protected] <[email protected]> on behalf of Floyd - K8AC via groups.io <floydsense@...>
Sent: Friday, December 13, 2024 11:16 AM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] CW Sidetone ideas ?
Walt - The sidetone generator is complete and working well.? The generator circuitry is housed in an external minibox and there are zero modifications to the SX-117 or HT-44.? All connections to the gear are external.? No special parts required other than
the high voltage PNP transistor.? I'm not an engineer and I suspect there are more elegant ways to accomplish this, but it does work well for me.? Here is the schematic and a photo of the unit.
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73, Floyd - K8AC
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Re: CW Sidetone ideas
Walt - The sidetone generator is complete and working well.? The generator circuitry is housed in an external minibox and there are zero modifications to the SX-117 or HT-44.? All connections to the gear are external.? No special parts required other than the high voltage PNP transistor.? I'm not an engineer and I suspect there are more elegant ways to accomplish this, but it does work well for me.? Here is the schematic and a photo of the unit.
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73, Floyd - K8AC |
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Hallicrafters Radios Prices in 1959
开云体育Hi all, Digging in old museum papers sometimes provide some interesting views to the past. See attached. The prices are in 1959 Canadian dollars. Payette Radio was the biggest consumer/industrial electronics supplier in eastern Canada then. ? 73, Jacques, VE2JFE in Montreal |
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Re: HT-45 tuning
Brian,
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If the power supply is wired properly, as Ed indicated, the "PLATE" light will only illuminate when AC is provided to the HV relay.? (I.E. the PLATE switch is ON? and the FIL switch is ON)
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Also, if HV is available, the NE51 on the power supply box will only illuminate if actual HV is present
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The FIL switch provides AC to the Blower and filament transformer and to the HV SWITCH powering the HV relay in the power supply such that HV cannot be switched on unless the FIL switch is on.?
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The operator has to wait after powering the filaments so as to allow time for? mercury vapor rectifiers to heat (use 3B28's and the time is much less....and if you replace with solid state rectifiers, you essentially eliminate the need to wait at all.....the 3-400 like the 4-400 & 3-500 filaments are essentially "instant-ON" (R & L Drake applies FIL and HV simultaneously in the?? L-4/L-4B/L-7 amplfiers)
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But to your question, IF the HV "light" (on the power supply)? is illuminated with the HV switch OFF (after waiting for the filter cap to discharge) .....it would appear the HV switch is either staying closed or the relay contacts are "welded" --ON.?
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Note that the primary power is ALWAYS present at the relay regardless of switch position.? Closing the relay then applies power to the plate transformer.?
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When I rebuilt my power supply using the Drake L-4B transformer, I eliminated the rectifier filament transformer, the original plate transformer, oil cap and choke.? I used? pair of SEMTEC 5000V solid state rectifiers PLUS a (Harbach) filter-cap board for a Heathkit SB220.? I wired the entire mess similar to an L-4B using a voltage doubler.
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I also eliminated the relay and used a pair of solid state relays in each leg of? 240VAC? powering the transformer.
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I did however keep the HV "light" which only illuminates with HV present.? It's a great safety feature.
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Brian <1codetech@...> wrote --
73/Rick W7IMM __________________________________ All posts are created using free and opensource? Linux |
don Root
Bill (Group Owner)
Ray, W4BYG
Floyd - K8AC
waltcates
Jacques_VE2JFE
Rick W7IMM