It has been recapped, and seems to receive well on both AM and FM, but
audio quality is poor on FM broadcast on all stations.
Have tried to improve the FM alignment, and have not had any improvement.
All tubes have been checked good,and swapped between both radios 62 ans 62A? Audio on AM seems fine
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Scott: your 62 could need alignment as Steve said, or maybe some tubes, caps etc are tired? you didn't say what state it is in.
But i forgot one thing before ..i belong to the Fmtuners group .. and they say some stations with "Digital" reek havoc on many older FM tuners.... so is the problem on most stations?
hope you can get the 62 purring like Steve's
73? don VA3DRL
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I don’t have a SX-62 but have heard about them. ?The audio should be superb with FM reception. ?
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On Sun, Jan 15, 2023 at 6:22 PM, don Root < drootofallevil@...> wrote: Scott: your 62 could need alignment as Steve said, or maybe some tubes, caps etc are tired? you didn't say what state it is in.
But i forgot one thing before ..i belong to the Fmtuners group .. and they say some stations with "Digital" reek havoc on many older FM tuners.... so is the problem on most stations?
hope you can get the 62 purring like Steve's
73? don VA3DRL
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Scott: your 62 could need alignment as Steve said, or maybe some tubes, caps etc are tired? you didn't say what state it is in.
But i forgot one thing before ..i belong to the Fmtuners group .. and they say some stations with "Digital" reek havoc on many older FM tuners.... so is the problem on most stations?
hope you can get the 62 purring like Steve's
73? don VA3DRL
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The FM on the SX-62 should give you great audio quality. ?If not, the FM IF chain?may need re-alignment or something else is wrong. ?
73 - Steve, KW4H?
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On Sun, Jan 15, 2023 at 5:22 PM, Scott Petersen < s-petersen@...> wrote:
The audio is a bit muffled, the signal has 2 closely spaced narrow peaks, but
even when the clearest peak is selected, the audio is not strong and clear, I think I've heard it has something to do with the bandwidth of the IF transformers, and the compromise of narrow band FM.
Signal reception is good, but it is only a guess as there is no signal meter on
the 62
On Sun, Jan 15, 2023 at 03:55 PM, Scott Petersen wrote:
For some reason I could not get the SX-62 to play FM broadcast as good as a cheap table
radio, I was disappointed that a radio as nice as the 62 couldn't beat a tabletop. I have 2 of them, both pretty much the same.
Scott, mine is still in sick bay, so i cant say either way, but I wonder if you have a reasonable antenna as was needed/expected back then? ?
newer? table tops often are designed for an internal whip.
you didn't mention if you had weak signals or poor audio on the 62.
hope maybe you can get it performing.
73 Don VA3DRL
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The FM on the SX-62 should give you great audio quality. ?If not, the FM IF chain?may need re-alignment or something else is wrong. ?
73 - Steve, KW4H?
Sent from Proton Mail for iOS
On Sun, Jan 15, 2023 at 5:22 PM, Scott Petersen < s-petersen@...> wrote:
The audio is a bit muffled, the signal has 2 closely spaced narrow peaks,
but even when the clearest peak is selected, the audio is not strong and clear, I think I've heard it has something to do with the bandwidth of the IF transformers, and the compromise of narrow band FM.
Signal reception is good, but it is only a guess as there is no signal
meter on the 62
On Sun, Jan 15, 2023 at 03:55 PM, Scott Petersen wrote:
For some reason I could not get the SX-62 to play FM broadcast as good as a cheap table radio,
I was disappointed that a radio as nice as the 62 couldn't beat a tabletop. I have 2 of them, both pretty much the same.
Scott, mine is still in sick bay, so i cant say either way, but I wonder if you have a reasonable antenna as was needed/expected back then? ?
newer? table tops often are designed for an internal whip.
you didn't mention if you had weak signals or poor audio on the 62.
hope maybe you can get it performing.
73 Don VA3DRL
|
The audio is a bit muffled, the signal has 2 closely spaced narrow peaks,
but even when the clearest peak is selected, the audio is not strong and clear, I think I've heard it has something to do with the bandwidth of the IF transformers, and the compromise of narrow band FM.
Signal reception is good, but it is only a guess as there is no signal
meter on the 62
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Show quoted text
On Sun, Jan 15, 2023 at 03:55 PM, Scott Petersen wrote:
For some reason I could not get the SX-62 to play FM broadcast as good as a cheap table radio,
I was disappointed that a radio as nice as the 62 couldn't beat a tabletop. I have 2 of them, both pretty much the same.
Scott, mine is still in sick bay, so i cant say either way, but I wonder if you have a reasonable antenna as was needed/expected back then? ?
newer? table tops often are designed for an internal whip.
you didn't mention if you had weak signals or poor audio on the 62.
hope maybe you can get it performing.
73 Don VA3DRL
|
On Sun, Jan 15, 2023 at 03:55 PM, Scott Petersen wrote:
For some reason I could not get the SX-62 to play FM broadcast as good as a cheap table radio, I was disappointed that a radio as nice as the 62 couldn't beat a tabletop. I have 2 of them, both pretty much the same.
Scott, mine is still in sick bay, so i cant say either way, but I wonder if you have a reasonable antenna as was needed/expected back then? ? newer? table tops often are designed for an internal whip. you didn't mention if you had weak signals or poor audio on the 62. hope maybe you can get it performing. 73 Don VA3DRL
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For some reason I could not get the SX-62 to play FM broadcast as good
as a cheap table radio, I was disappointed that a radio as nice as the 62 couldn't beat a tabletop. I have 2 of them, both pretty much the same.
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On Sun, Jan 15, 2023 at 03:13 PM, don Root wrote:
73 don VA3DRL?
re what i just posted ... somehow it all ended up under "quoted text"
dunnoWatImdoin
73 don VA3DRL?
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On Sun, Jan 15, 2023 at 03:13 PM, don Root wrote:
73 don VA3DRL?
re what i just posted ... somehow it all ended up under "quoted text" dunnoWatImdoin 73 don VA3DRL?
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jan 18 ? attempting to edit??? original which mostly went into "quoted text" i have got this topic still dangling in my drafts-unresolved basket ..and am trying to get closer to an answer. On Fri, Nov 4, 2022 at 02:12 PM, Richard Knoppow wrote:
- I still am not clear on a couple of things.? Is the double peak on one station only?? And secondly how are you seeing it?? I thought the 62 does not have a tuning indicator, am I wrong?? ?A problem with the IF or detector should show up on all stations.? If this appears on one station it is something else
Richard; I believe he does not need to see it with a tuning meter; as one tunes, the station audibly becomes fairly clear then becomes weak and/or distorted, then becomes clear again.. that's from my memory of some stations back in the late 1950's I bypass the other fragments for now. Re: an earlier comment...Re:" the rotor is going past maximum"...
- I am not familiar with the construction of the SX-62 but wonder if it's possible that the rotor is going past maximum capacitance so that it's tuning higher again.? Visual inspection would probably tell.
Richard; you really pulled the wool over my eyes, and i guess the others too..I've been conned!, cant think!!! It seems to me the frequency of 88.7? is close to the bottom of the official new FM band [ center frequency = 87.9?MHz ], as we knew it? after 1945, but we hardly need to inspect the tuning cap; just look at the SX-62's specs or better, just look at the dial scale. i clearly see it starting before 54 Mcees and ending just over 108 Mcees ----so 88.7 will be near mid range of the sx-62 scale, so the tuning cap must be near mid rotation; nowhere near the end of "normal-nice-curve" of capacitance vs degrees of rotation. also; you likely meant "below minimum", not "past maximum" , which could also apply.? Now, I somewhat? agree, with some suggestions that the problem might be in the IF, and due to bad alignment, or some IF cap [not SMD] shifted, but we expect double tuning all over the FM band, and we never had any input from Waldo? on that.. I am going out on a limb to suggest an alternative: especially if the signal is weak, the limiter action are is poor, and normal Fm detection fails, but the wide side slopes of the old IF circuits, will allow [AM] slope detection when tuned to either above or below the center frequency. Likely, poor tuning of the IF will make this more likely.. 73 don VA3DRL?
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I?saw one in operation decades ago (I was a teenager) when the Indianapolis Radio Club visited the Hallicrafters plant in Chicago... one of the employees had it in his car, and made a DX contact. ?I was in immediate lust.
I?do?have the original FTM-100 instruction manual that I picked up several years ago... the closest I'll ever come to a rig that was nearly $3K circa 1960 (would be about $30K today).
Denny W4DWC
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What I have was published by Hallicrafters,? not Sam's ? The earliest model was the S-40, the S-40A is a later model.? The S-40-B is redesigned and has significant differences from earlier models.? It was evidently intended to be cheaper to build but i suspect it has better performance
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-------- Original message -------- From: don Root <drootofallevil@...> Date: 1/14/23 7:20 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] S-40a speaker
On Thu, Jan 12, 2023 at 02:45 PM, Richard Knoppow wrote:
The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.
Richard and any listeners-in the BAMA? S-40Sams?? seems to be for those units? before the A version. the parts list shows an electrodynamic speaker. then goes on to say later ones were PM. If this is really for the "S-40" I wonder why the A version used any ED's by the way.. for anybody this "manual" has lots of good pictures at the last there are two hard to read pages re changes ..including the speaker I saw nothing about A or B versions in here. 73?? don
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On Thu, Jan 12, 2023 at 02:45 PM, Richard Knoppow wrote:
The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.
Richard and any listeners-in the BAMA? S-40Sams?? seems to be for those units? before the A version. the parts list shows an electrodynamic speaker. then goes on to say later ones were PM. If this is really for the "S-40" I wonder why the A version used any ED's by the way.. for anybody this "manual" has lots of good pictures at the last there are two hard to read pages re changes ..including the speaker I saw nothing about A or B versions in here. 73?? don
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Re: SX-62 Front Panel Paint
I never did the ‘62s front, but the other two colors were perfect matches of Plasti-Kote car paint… Auto Zone.? The gunmetal silver and grey were astoundingly right on..
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Re: general question re polarized ac plugs on receivers as shipped originally
? My generator is a PE-75-AF the last of a long line of models. Voltages measurement were taken with a Fluke meter. Have TM11-900A which covers my gen set. Found the TM over on smokstak. The house I grew up in was in South Tampa . The ground was a metal pipe driven in the ground near the house. My dad had a meter sold by Sears model unknown. When the Service was upgraded Teco had to install a new transformer on the power pole. The old transformer remained in place for the other houses. My dad passed in 1994 and the old transformer was still in service at that time. The house was built in 1903 and received electric power in 1931. The orginal lighting was with gas. The wiring was ball and tube which was all replaced with the new service. ?
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Re: SX-71 frequency shift
Thanks for help and suggestions. The 6U8 mixer was microphonic (as is common) and replaced with a 6EA8 equivalent improvement. Nice!
Now cleaning rotor bearings in Main Tuning capacitor and hoping it all becomes rock solid!.
Will keep you posted.
On Thu, Jan 12, 2023 at 11:34 PM, waltcates <cateswa@...> wrote:
The two best candidates are: 1 a microphonic tube,
2 a microphonic I.F. can. It could be as simple as reseating the tubes.? Just about every part and solder connection in the radio can become microphonic. Open it up and tap around with a plastic tuning tool or small wooden dowel.
?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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Richard, and anyone else As to the first S-40 speakers being a carry-over from the S-22R.. I found this: The s-20 appears to have an electrodynamic ?speaker…. with a hum-bucking coil .. and? with ?phones powered thru a cap connected to the plate. The s-20R appears to have a PM speaker …. And with ?phones powered by the output transformer. I don’t think I found evidence of any S-40 ?speaker…. with a hum-bucking coil .. For anyone too young most of my 1930’s consoles had ?hum-bucking coil …I think ? The sams stuff on bama ?for “s-40” shows a PM speaker.. maybe dwg is for some 40A’s or the 40B .. who knows? The sams stuff on bama ?for “s-40A” shows a PM speaker.. ? But now it is late but an s-40techman? shows s-40A with an electrodynamic Cant see any manual for an? orig? S-40 ?
this^^ riders shows … the S-40 rev1 [lower in pic] with a ??5 prong plug to the PM speaker the s-40 rev2 [top in pic] with a PM speaker and no plug ?? this seems to contradict your statement,, but they do call them rev1 and rev2 …cant see a no-rev schematic …but then there is this next speaker? ?=ED?????? Pic of ?Front of cab has “S-40” ? any thoughts?? ? ? see attached ?…seems that Jensen is just pushing Alnico5 in april ’45.. a bit early …….. worn out too much searching? 73 don VA3DRL ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow
Sent: Thursday, January 12, 2023 5:45 PM
To: [email protected]
Subject: [HallicraftersRadios] S-40a speaker? The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock. ?
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Yes it is. I have one as well that used to belong to Gen. LeMay. Good story about it as well. 73 – Mike ? Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 ?
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From: [email protected] < [email protected]> On Behalf Of John K5MO Sent: Friday, January 13, 2023 12:10 PM To: [email protected]Subject: Re: [HallicraftersRadios] rare rig on auction ? I hope I'm nowhere near a computer on Feb 2 ? On Fri, Jan 13, 2023 at 11:59 AM waltcates <cateswa@...> wrote: Auction @??. With documentation from original owner. | Our first auction of the New Year is scheduled for January 19th - February 2nd, 2023 @ 7PM CT Photos and catalog will be added soon, so check back often. |
? Your past has no control over your future. Only your NOW can impact your future.
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Oh, that's nice.
I hope I'm nowhere near a computer on Feb 2
John K5MO
On Fri, Jan 13, 2023 at 11:59 AM waltcates < cateswa@...> wrote:
Auction @??. With documentation from original owner.
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Our first auction of the New Year is scheduled for January 19th - February 2nd, 2023 @ 7PM CT Photos and catalog will be added soon, so check back often.
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?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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Auction @??. With documentation from original owner.
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Our first auction of the New Year is scheduled for January 19th - February 2nd, 2023 @ 7PM CT Photos and catalog will be added soon, so check back often.
www.schulmanauction.com
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?Walt Cates,
WD0GOF
?
Your past has no control over your future. Only your NOW can impact your future.
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don Root
Denny Colvin
waltcates