Re: Hallicrafters S-107 Very First version...Not the MK1
Digging in more on this S107. Finding more and more that have been done wrong. For some reason when it was recapped, the person used a .02 mfd electrolytic cap (C53..I think it is on the schematic) where a film cap should have been used. This may be the culprit of the 1k ohm resistor heating up that goes off the 6k6gt audio tube. Will be reworking the can cap and remove the mess underneath the radio. And instead of using a 680 ohm and 1.2k ohm 2 watt resistor off the 6k6, they used 2 680 ohm 2 watt resistors. I am sure this is not helping either.?
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Re: S-38B Power Consumption
Ron, Do Australia houses use a hot wire, + a grounded neutral, + a safety ground [three prong plugs] so will you use a three prong ?plug. an auto-transformer ?should be more efficient. How do you intend to handle the ON/OFF switching? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Ron Sharp via groups.io
Sent: Friday, April 11, 2025 7:02 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-38B Power Consumption? Thanks for the good information on the current drain of the S-38B. My intention is/was to use a Triad Magnetics TR6-120 transformer that has a 230VAC or 115VAC input and an output of 120VAC at 0.25A, which is available from Element14. Also, I was intending to place the transformer inside the radio and also use a ground connection to overcome the hot chassis issue. Australian 240V?mains supply provides for a ground connection at the wall socket. I want to avoid using an external transformer, so will see what else is available. -- don??? va3drl
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Re: S-38B Power Consumption
Hi folks,
Thanks for the good information on the current drain of the S-38B.
?
My intention is/was to use a Triad Magnetics TR6-120 transformer that has a 230VAC or 115VAC input and an output of 120VAC at 0.25A, which is available from Element14. Also, I was intending to place the transformer inside the radio and also use a ground connection to overcome the hot chassis issue. Australian 240V?mains supply provides for a ground connection at the wall socket.
?
I want to avoid using an external transformer, so will see what else is available.
?
Cheers
Ron
VK2IRS
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Thanks, guys, for all the replies. That is what I thought, just wanted to check to see if some one had started it back up.
73 and happy weekend!!!!!
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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we had one when Duane was alive but haven't heard a specific one in years.
20 meter vintage SSB net usually met around 14.293 MHz; heathkit net generally followed it.
40 meters:
?
Pete, wa2cwa
?
On Fri, 11 Apr 2025 18:51:24 +0000 "waltcates via groups.io" < cateswa@...> writes:
Does a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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Re: S-38B Power Consumption
Ron, Perhaps you are ?wanting a 240-120 nominal step-down transformer? for use in Australia? And want it to be isolating Perhaps it will be located nearby the radio in open air? Or within the radio where mutual heating should be considered? Have you decided on grounding for the radio, which in the original incarnation has a possible “hot chassis” ? -- don??? va3drl
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we had one when Duane was alive but haven't heard a specific one in
years.
20 meter vintage SSB net usually met around 14.293 MHz; heathkit net
generally followed it.
40 meters:
?
Pete, wa2cwa
?
On Fri, 11 Apr 2025 18:51:24 +0000 "waltcates via groups.io" < cateswa@...>
writes:
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Show quoted text
Does
a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
? A majority of acceptance is not proof of correctness.
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Re: S-38B Power Consumption
Not sure that a higher VA rating is really necessary for this small of an isolation transformer.
"It is possible to estimate the output voltage at intermediate
loads since load regulation varies in an almost linear manner.
For example, the 241-8-16 has a full-load rating of 16 V @
6.25 A and a regulation of 10%. Its no-load output would be
10% more than 16 or 17.6 V. At half-load (3.12 A) its output
would be 5% more than 16 or 16.8 V. Similar estimates can
be made for any % load.
Another factor to bear in mind is that it is possible to
safely exceed the VA rating
of many small power transformers. If the added
regulation (drop in output
voltage) is acceptable, an
“overload” may be permissible because the design
is regulation-limited rather
than heat rise-limited."? This is from:?
In other words, if a lower output voltage is tolerable say 95% worse case of 120 vac or some 114 vac then a 25 VA transformer operated at 100% of it's VA rating does no harm.? I doubt that the isolation transformer will be too warm to touch. Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
Ron,?
I just measured my s38b and it draws 208 mA with a supply voltage of 121 VAC. I think I would use a transformer with a good safety headroom. Maybe 50 VA so it doesn't get hot.?
73 Don ve3ids?
Hi folks,
I am restoring a Hallicrafters S38-B receiver and want to add an isolation transformer. So that I can select the correct transformer, I need to know the actual current the S38-B draws. I note in a PhotoFact Folder on the first model (the S-38) the current drain is shown 0.245 Amps @ 117V AC. This is cutting it fine with the transformer that I have (30VA), but as there is no BFO tube in the S-38B, I figure there may be less current drain overall. I recognise that the heater chain will still draw 150mA, but there should be a reduction in the DC (B supply) due to one less tube.
?
Would someone please advise the actual current drawn by the S38-B operating with an AC input?
?
Cheers
Ron
VK2IRS
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The Vintage SSB Roundtable meets every Tuesday night at 7:00 PM CA time.
Early check-ins start at 6:30 PM.
Frequency is 3895.
It would be wonderful to hear some of you on from the Halli group!
Bob C. WA9JIB
= = = = =
On Friday, April 11, 2025 at 12:52:01 PM PDT, edward schumacher <eddiewa9gqk@...> wrote:
There is a vintage ssb net I ran across a few months back and it is not brand specific. Have to page back through my scratch sheets to find the info. Think they were followed by a Heath net. Someone on one? of those might know if there is one for Hallicrafters.
When I get back down to my station I will check and send the? info.
Ed, WA9GQK
On Friday, April 11, 2025 at 01:51:31 PM CDT, waltcates via groups.io <cateswa@...> wrote:
Does a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
|
There is a vintage ssb net I ran across a few months back and it is not brand specific. Have to page back through my scratch sheets to find the info. Think they were followed by a Heath net. Someone on one? of those might know if there is one for Hallicrafters.
When I get back down to my station I will check and send the? info.
Ed, WA9GQK
On Friday, April 11, 2025 at 01:51:31 PM CDT, waltcates via groups.io <cateswa@...> wrote:
Does a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
|
Walt
there use to be a net but sadly i have not heard it in years.
hope they just moved freq
73
Tony WA4JQS
On 4/11/2025 2:51 PM, waltcates via
groups.io wrote:
Does a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
--
Anthony W.DePrato WA4JQS
CQ DX HALL OF FAME #39
DXCC HONOR ROLL CW PHONE RTTY
CALLS HELD VP8SSI VP8BZL V31SS 3Y0PI ZS8JQS WA4JQS/KC4 WA4JQS/ZS1
|
Does a Hallicrafters HF net exist.?
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
|
Re: S-38B Power Consumption
Ron,?
I just measured my s38b and it draws 208 mA with a supply voltage of 121 VAC. I think I would use a transformer with a good safety headroom. Maybe 50 VA so it doesn't get hot.?
73 Don ve3ids?
Hi folks,
I am restoring a Hallicrafters S38-B receiver and want to add an isolation transformer. So that I can select the correct transformer, I need to know the actual current the S38-B draws. I note in a PhotoFact Folder on the first model (the S-38) the current drain is shown 0.245 Amps @ 117V AC. This is cutting it fine with the transformer that I have (30VA), but as there is no BFO tube in the S-38B, I figure there may be less current drain overall. I recognise that the heater chain will still draw 150mA, but there should be a reduction in the DC (B supply) due to one less tube.
?
Would someone please advise the actual current drawn by the S38-B operating with an AC input?
?
Cheers
Ron
VK2IRS
|
Hi folks,
I am restoring a Hallicrafters S38-B receiver and want to add an isolation transformer. So that I can select the correct transformer, I need to know the actual current the S38-B draws. I note in a PhotoFact Folder on the first model (the S-38) the current drain is shown 0.245 Amps @ 117V AC. This is cutting it fine with the transformer that I have (30VA), but as there is no BFO tube in the S-38B, I figure there may be less current drain overall. I recognise that the heater chain will still draw 150mA, but there should be a reduction in the DC (B supply) due to one less tube.
?
Would someone please advise the actual current drawn by the S38-B operating with an AC input?
?
Cheers
Ron
VK2IRS
|
Re: Hallicrafters S-107 Very First version...Not the MK1
And I have it now thanks to Pete!
Really appreciate your product!
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Re: Hallicrafters S-107 Very First version...Not the MK1
wants schematic for 1st version not 3rd version.
?
Pete, wa2cwa
?
On Wed, 9 Apr 2025 03:11:43 +0000 "waltcates via groups.io" < cateswa@...>
writes:
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SEE
attachement.
Walt Cates, WD0GOF
? A majority of acceptance is not proof of correctness.
Working to restore a S-107. This is the first version with the 6SC7 tube
before they went to the 12AX7.
I can only find a schematic for the MK1 & 2 which use the
12AX7.
Someone has done a half hearted attempt at recapping this one and did the
can cap conversion underneath.
While doing this, they took some liberties with the 680 and 1000 ohm (R37
& 38 I think) and replaced them with 2 of the 680 ohm 1 watt
resistors.
But also found what I think is a 1 ohm carbon resistor between the
rectifier and the 6K6GT.
I am not certain that is even correct or needed.
Have yet to find it on the MK2 schematic but I admit my ability to follow
drawings is slow.
Could possible be overlooking it and not realize.
Would anyone by chance have a schematic of the S107 based on the 6SC7
tube??
?
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Re: Hallicrafters S-107 Very First version...Not the MK1
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On Tuesday, April 8, 2025, 8:11 PM, waltcates via groups.io <cateswa@...> wrote:
SEE attachement.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
Working to restore a S-107. This is the first version with the 6SC7 tube before they went to the 12AX7.
I can only find a schematic for the MK1 & 2 which use the 12AX7.
Someone has done a half hearted attempt at recapping this one and did the can cap conversion underneath.
While doing this, they took some liberties with the 680 and 1000 ohm (R37 & 38 I think) and replaced them with 2 of the 680 ohm 1 watt resistors.
But also found what I think is a 1 ohm carbon resistor between the rectifier and the 6K6GT.
I am not certain that is even correct or needed.
Have yet to find it on the MK2 schematic but I admit my ability to follow drawings is slow.
Could possible be overlooking it and not realize.
Would anyone by chance have a schematic of the S107 based on the 6SC7 tube??
|
Re: Off-the-wall question
I bought an XM receiver at a hamfest a few years ago. It was "open". To use it, you tune your FM car radio to an open frequency and simply listen to it. No hardwire necessary. I assume they still work that way?
K3HVG
On 04/08/2025 7:56 PM EDT Scott Petersen via groups.io <s-petersen@...> wrote:
?
?
There is an audio to FM stereo adapter that was popular a while ago, takes earphone and converts to FM stereo for your car radio to pick up
?
?
I would like to add SiriusXM to the radio in my 1999 Chevy Tahoe. It doesn’t have an Aux radio input. Does anyone know of a way to input the Sirius audio through the cassette input (some sort of an adapter)?
Sorry for the non-Hallicrafters question.
Skip Magnuson W7WGM
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Re: Hallicrafters S-107 Very First version...Not the MK1
SEE attachement.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
toggle quoted message
Show quoted text
Working to restore a S-107. This is the first version with the 6SC7 tube before they went to the 12AX7.
I can only find a schematic for the MK1 & 2 which use the 12AX7.
Someone has done a half hearted attempt at recapping this one and did the can cap conversion underneath.
While doing this, they took some liberties with the 680 and 1000 ohm (R37 & 38 I think) and replaced them with 2 of the 680 ohm 1 watt resistors.
But also found what I think is a 1 ohm carbon resistor between the rectifier and the 6K6GT.
I am not certain that is even correct or needed.
Have yet to find it on the MK2 schematic but I admit my ability to follow drawings is slow.
Could possible be overlooking it and not realize.
Would anyone by chance have a schematic of the S107 based on the 6SC7 tube??
|
Hallicrafters S-107 Very First version...Not the MK1
Working to restore a S-107. This is the first version with the 6SC7 tube before they went to the 12AX7.
I can only find a schematic for the MK1 & 2 which use the 12AX7.
Someone has done a half hearted attempt at recapping this one and did the can cap conversion underneath.
While doing this, they took some liberties with the 680 and 1000 ohm (R37 & 38 I think) and replaced them with 2 of the 680 ohm 1 watt resistors.
But also found what I think is a 1 ohm carbon resistor between the rectifier and the 6K6GT.
I am not certain that is even correct or needed.
Have yet to find it on the MK2 schematic but I admit my ability to follow drawings is slow.
Could possible be overlooking it and not realize.
Would anyone by chance have a schematic of the S107 based on the 6SC7 tube??
|
Re: Off-the-wall question
There is an audio to FM stereo adapter that was popular a while ago, takes earphone and converts to FM stereo for your car radio to pick up
toggle quoted message
Show quoted text
I would like to add SiriusXM to the radio in my 1999 Chevy Tahoe. It doesn’t have an Aux radio input. Does anyone know of a way to input the Sirius audio through the cassette input (some sort of an adapter)?
Sorry for the non-Hallicrafters question.
Skip Magnuson W7WGM
|
don Root
waltcates
Peter A Markavage
Jim Whartenby
Anthony W. DePrato
Don VE3IDS
