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Re: Halicrafters SX17 transformer
John The SX17 manual says that the measurements shown in the tube voltage chart were made at a line voltage of 115 VAC.? That does not mean that the SX-17 was designed for operation at 115 VAC, it just means that the voltages measured are most likely within +/- 10% of the values given in the chart at that line voltage.? Note too that the voltmeter was specified at 1000 ohms per volt.? Modern DVMs have a much higher input impedance so the voltages you measure will also be higher then those listed in the chart. Restating the above with some background, the 1927 NEMA socket voltage convention is that the 115 VAC line will vary +/- 10% so one can expect a line voltage to vary from 104 VAC to 126 VAC.? The 1930 Rider's Perpetual Troubleshooters Manual lists the early battery eliminators which show a similar variation in line voltage.? Once the radio manufactures accepted the 115 VAC convention, they only listed the average 115? AC line voltage on schematics and parts lists.? When all is said and done, you want the vacuum tube (valve) heaters to be at a nominal 6.3 volts as measured at the tube socket.? Best tube life will be at a heater voltage of 6.0 volts or so. Plate voltage can vary +/- 10% and the radio will still operate satisfactorily. About the power transformer rating.? You should be able to calculate the cathode current for most tubes in the SX-17.? The voltage given for the cathode is listed in the tube voltage chart, the cathode resistor value is given in the parts list.? Or one can just look in your favorite tube manual for plate and screen currents at the plate voltage given.? Same can be done for heater current for all tubes except for the power rectifier.? When all of this is done you should have a good idea of the requirements for the power transformer. The show stopper may be the foot print of the power transformer.? How tall the replacement transformer is should not be that important as long as the replacement transformer is taller.? More iron is better, especially at 50 cycles.? You might as well look for a dual primary transformer so that you can operate at either 115 or 230 volt line.? Let us know what you figure out and what you used for your calculations.?? I may have a suitable power transformer here in Arkansas for the cost of postage. Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Monday, May 27, 2024 at 12:55:23 PM CDT, John via groups.io <siloam@...> wrote:
A few months ago I acquired a Hallicrafters SX17 receiver intending to restore it as a winter project. Well the winter months have come and gone and I have finally gotten around to getting it on the bench (without injury to self I might add - it is a bit of a boat-anchor!) for a preliminary look. This is my first time on here, so just wanted to say hello to everyone and thank the moderator for accepting me into the group. As might be expected for something from circa 1937, the radio is in a bit dirty and metal surfaces are oxidized. Some of the wiring (particularly the mains) looks a bit of a mess and will require re-wiring, but the immediate showstopper is the fact that the power transformer (T7) has an open primary. There seems to be no indication on the radio of the mains input voltage, however, I have read that these were made to be powered from a 110Vac line? Since the radio is located in the UK, it may have been previously assumed that it would run from UK mains which is at 230Vac, which might perhaps explain the open transformer.... Can anyone confirm whether these were ever made for the UK market and for 240Vac mains supply? The next question is whether it is possible to source a replacement? The manual I have found does not indicate the transformer voltages so I wondered whether anyone has this information? This looks like it is going to be a huge project but I think it would be interesting to restore this circa 90 year old receiver if possible. |
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Re: Halicrafters SX17 transformer
¿ªÔÆÌåÓýJohn ,? very often, there was a universal transformer option.? For many models it is listed only in the parts list after the normal transformer. I looks on? BAMA?? ?? but don¡¯t see any transformation at all in the parts list. Others know more I¡¯m sure don ? ? From: [email protected] [mailto:[email protected]] On Behalf Of John via groups.io
Sent: Monday, May 27, 2024 1:04 PM To: [email protected] Subject: [HallicraftersRadios] Halicrafters SX17 transformer ? A few months ago I acquired a Hallicrafters SX17 receiver intending to restore it as a winter project. Well the winter months have come and gone and I have finally gotten around to getting it on the bench (without injury to self I might add - it is a bit of a boat-anchor!) for a preliminary look. This is my first time on here, so just wanted to say hello to everyone and thank the moderator for accepting me into the group. _._,_._,_
-- don??? va3drl |
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HT45 Loudenboomer working now with new power supply
Anyone out there with one of these currently using it on the air?
?Just got my home brewed power supply finished using the Drake L-4B plate transformer (wired for 240VAC) , voltage doubler using (2) Semtech 5000v diode stacks and Harbach (SB220) 8x330uF board. -- 73/Rick W4XA __________________________________ All posts are created using OpenSuSE Leap 15.5 x64 Linux |
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Re: New Member Checking In
¿ªÔÆÌåÓý
Welcome to the group Jerry. Good luck on your quest for the cw filter.?
Walt Cates, WD0GOF
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From: [email protected] <[email protected]> on behalf of W0PWE via groups.io <j.b.hall@...>
Sent: Tuesday, May 21, 2024 1:55 PM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] New Member Checking In ?
I just discovered this group so I signed up and thought I would introduce myself to get the first message out of the way.?
Most of my activity has been building homebrew and operating QRP CW. But last winter I got interested in trying to bring my HT-46 back to life after about 45 years of abuse and non-use. The HT-46 replaced my Novice transmitter and served me well as an General and Extra in the mid 70's. I always wanted, but never owned the SX-146 receiver to go with it. The HT-46 was DOA when I pulled it out of the attic last winter but with Walt's (WD0GOF) document and a few helpful e-mails from him I got it working enough to make a few CW and SSB qsos. Cosmetically the HT-46 is extremely rough.? Last week I finally crossed off a top ten bucket list item by attending the Dayton Hamvention. In the rain and muck of Friday morning a friend and I waded into the flea market and the first table we went to had a pristine HT-46 and SX-146 sitting there under some other stuff. Call it divine intervention, dumb luck or whatever but it seemed that I had no choice but to buy them.? I haven't played with the HT-46 yet but I powered up the SX-146 and tested it last night and it sounds great. It only has the 2.1KHz filter and I would love to have the 500Hz filter but I imagine those are pretty hard to come by. Anyway, thanks for letting me in the group. I am looking forward to learning more about the great Hallicrafter's gear.? 73 - Jerry - W0PWE |
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Re: Hallicrafters and National Matsushita Generator manuals
Yes, Thank you for the suggestions Tom, and Peter too! I have been trying all three names, and different combinations of them too, for some time now. The only documentation I can find is on the digital models, that seem much newer. I was hopping that someone in the group might have actually had the documentation. Thanks again for the help, -Drew KN6WFM 73? ?
On Tuesday, May 21, 2024 at 06:26:05 AM PDT, Tom Dailey <radio@...> wrote:
... and Matsushita sold products under their "home" name NATIONAL... Early video gear that I worked on often arrived with Matsushita, National, OR Panasonic name badges.... check all 3. Tom - W?EAJ |
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Re: SR2000 CW Offset
I? contacted Bomar about crystals for my SX-117 and they wanted complete specs for the crystal, which of course I didn't have.? I offered to send them the schematic so they could maybe determine what they needed, but they couldn't do that.? It appears that no one is making crystals in HC-6 holders these days, but I ended up buying one in an HC-49 holder (smaller than HC-6 and with leads instead of pins).? The supplier was Krystaly in the Czech Republic.? You can contact them at: krystaly@... .? It took around 5 weeks for delivery and the price was $40 (includes $18 customs fee and $9 shipping).? You can use these crystals by taking one of the HC-6 holders apart and soldering the new crystal leads to the old pins.? I had previously done that with a 16 MHz crystal to get 10 MHz WWV on the receiver.? Krystaly's communications is excellent.??
73, Floyd - K8AC |
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Re: Hallicrafters and National Matsushita Generator manuals
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toggle quoted message
Show quoted text
Hallicrafters S-200?4 tubes and?5 bands.
Hallicrafters S-210? 6 tubes and 6 bands
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You can draw your own conclusions about "similar"!
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Although they both come in a simulated type wood?case style,
rectangular style dial, and they both come with 4 knobs.
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Get the correct manual aand schematic.
?
National (Matsushita) labeled AM Signal Generator VP-8271A, I believe, was
not sold in the U.S. Some of the "VP" labeled stuff from them was sold under the
Panasonic name here in the U.S.?Don't know if the VP-8271A was one of them.
Try searching just under the Panasonic name.
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Pete, wa2cwa
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On Mon, 20 May 2024 19:20:17 +0000 (UTC) "KN6WFM (Drew)" <agriffith@...> writes:
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Re: Hallicrafters and National Matsushita Generator manuals
Score! Thank you Walt!
On Monday, May 20, 2024 at 01:35:48 PM PDT, waltcates <cateswa@...> wrote:
Manualman.com has the S210 manual for $13.25.
Walt Cates, WD0GOF
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A majority of acceptance is not proof of correctness.
From: [email protected] <[email protected]> on behalf of KN6WFM (Drew) <agriffith@...>
Sent: Monday, May 20, 2024 2:20 PM To: HALLI IO GROUP <[email protected]> Subject: [HallicraftersRadios] Hallicrafters and National Matsushita Generator manuals ?
Greeting fellow Hallicrafters Enthusiasts,
I'm looking for two manuals:
1. The Hallicrafters S-200 or S-210 manual, or specifically the S-210 Schematic. I have a working S-210, that I re-capped, but it needs an alignment. I was told by someone at HI-FI Audio that they use the S-200 schematic in
place of the S-210, so their S-210 kit does not contain an actual S-210 schematic.
Are these two radios that similar, and if so does anyone have the S-200 schematic/manual???
2. Any chance anyone here have a manual for the National (Matsushita) AM Signal Generator VP-8271A? I believe this generator was from the early 1980, possibly the late 70s. I came across this at a swap-meet and paid $20 for
it, and it works. Unfortunately, the output sign-wave is slightly distorted, so it needs a little TLC.
On the Bama site there is a VP-8181A listed, but that's a digital generator, the VP_8271A is an Analog 100 to 30 mHz.
Thank you in advance,
-Drew
KN6WFM
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Re: Hallicrafters and National Matsushita Generator manuals
?
toggle quoted message
Show quoted text
Hallicrafters S-200?4 tubes and?5 bands.
Hallicrafters S-210? 6 tubes and 6 bands
?
You can draw your own conclusions about "similar"!
?
Although they both come in a simulated type wood?case style,
rectangular style dial, and they both come with 4 knobs.
?
Get the correct manual aand schematic.
?
National (Matsushita) labeled AM Signal Generator VP-8271A, I believe, was
not sold in the U.S. Some of the "VP" labeled stuff from them was sold under the
Panasonic name here in the U.S.?Don't know if the VP-8271A was one of them.
Try searching just under the Panasonic name.
?
Pete, wa2cwa
ps i have both hallicrafters listed on my web site if you want something
completely readable
?
?
On Mon, 20 May 2024 19:20:17 +0000 (UTC) "KN6WFM (Drew)" <agriffith@...> writes:
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Jim Whartenby
don Root
Rick W7IMM
waltcates
KN6WFM (Drew)
Floyd - K8AC
Peter A Markavage