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Re: New to Group
开云体育Hi Jim, I have been trying to reply but keep getting diverted. One problem is understanding the definition of a “big pin” tube. How big is “big”? ?I can find no definition. the 4,6,and older 7 Ing tubes have two ?0.156 ?[5/32?] inch pins and some .125 [1/8]inch pins but the 5 pin tube has only the smaller pins. ? Anyhow, I googled with “what is? a "big pin" radio tube?” ????and AI replied as follows” AI Overview A "big pin" radio tube, also known as a vacuum tube or electron tube, is a type of electronic device that uses the flow of electrons in a vacuum to control electrical signals, often used in older radio and audio equipment.? Here's a more detailed explanation:
A "big pin" radio tube is a type of vacuum tube, a device that uses the flow of electrons in a vacuum to control electrical signals.? ·? ·? How it works: Inside the tube, a heated filament (cathode) emits electrons, which are then controlled by a grid (a metal mesh) and attracted to a positively charged plate (anode).? ·? ·? Why it's called "big pin": The term "big pin" likely refers to the size and shape of the base or connector pins on the tube, which are larger than those on smaller tube types.? ·? ·? Examples: Some common "big pin" tube types include the 6L6, 6V6, 6K5, and 6C5.? ·? ·? Historical Context: Before the advent of semiconductor devices, vacuum tubes like these were widely used in various electronic applications, including radios, audio amplifiers, and television sets.? ·? ·? Modern Usage: While largely replaced by transistors and other solid-state devices, vacuum tubes are still used in some applications, particularly in audio amplifiers and specialized electronic equipment where their unique sound characteristics are desired.? ? More stuff later. ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Sunday, March 23, 2025 11:49 PM To: [email protected] Subject: Re: [HallicraftersRadios] New to Group ? AFAIK, all of the hallicrafters listed below have metal front panels and are housed in metal cases.? The S-10 / SX-10 did have an optional mahogany?case that the metal case slipped into but I doubt that any were actually sold.? If the production numbers are correct, at one time I owned 1.5% of production!? That would be three of them out of some 200 reportedly made. Still have two. ? The 5T is an odd one.? It uses all big pin tubes so it is obviously a much earlier design.? It is either the first or fourth superhetrodyne design sold by hallicrafters. ? hallicrafters receiver models Information gleaned from Max de Henseler and Chuck Dachis books S-1, S-2, S-3 TRF-regen, 5 tubes, manufactured by Silver-Marshall?, 1934 ++++++++++++++++++++++
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? _,_ -- don??? va3drl |
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Re: HT-37 CW Break-In Modification
Ed This is surprising.? The maximum service line voltage is 126 volts per ANSI C84.1.? This maximum line voltage has not changed at all since it was first published in 1954.? This is when the 120 volt ac line voltage convention was adopted.? The two previous line voltage conventions are 115 volts +/- 10% issued in 1926 and 117 volts +/- 7.5% issued around the beginning of WW2. The only voltage that really matters in tube powered equipment is the heater voltage.? The mean voltage for most common tubes is 6.3 volts with a voltage tolerance of +/- 10%.? Best performance is at 6.3 volts, longest life is at a lower heater voltage but at the price of lower cathode emission, shorter life is at a higher heater voltage which will have higher cathode emission.? For receiving tubes perhaps one will not notice much difference over the +/- 10% heater voltage tolerance.? Power tubes, perhaps over a 100 watts dissipation,? are a different matter and most manufacturers specify a tighter control of heater voltage, usually +/- 5%.? ?This just happens to be the same tolerance as the present 120 volt line voltage convention. Measure your heater voltage.? If it is within a few percent of nominal, then all is OK and you won't have to by any more VARIACs! Regards, Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Tuesday, March 25, 2025 at 07:44:11 PM CDT, edward schumacher <eddiewa9gqk@...> wrote:
Goes back quite a few years so not that relevant for this discussion. Did have Edison out back then and they verified my readings and said it was due to their tweaking the voltage for other customers around here who are still on the older aerial lines with more voltage drop during peak AC season. Those of us on the buried service saw higher voltage. Since then just run my vintage stuff off Variacs set to 115 to save their aged circuitry. My point was that if VOX circuit voltages are too far off it would affect function. Does not seem that this is the problem for Alan however as he has previously verified voltages. Also seems the mod was done correctly and he has checked the other usual suspects. Considering the tolerances of components back then the circuit should work unless a component has actually gone bad. I built my rig with many used parts and everything worked ok. Will take a closer look at the whole thing later tomorrow after doing errands. 73 ... Ed
On Monday, March 24, 2025 at 11:43:04 PM CDT, Jim Whartenby via groups.io <old_radio@...> wrote:
Ed Out of curiosity, what voltage do you measure on the 240 volt service line, hot to hot at the circuit breaker panel?? You should read close to 240 volts.? Over 250 volts or so is a problem for your electric service provider to solve.? If one hot to neutral reads 130 vac and the other reads 110 vac then you don't have a solid neutral connection at the circuit breaker panel.?? Is your house wired with copper or aluminum wire? Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Monday, March 24, 2025 at 05:16:30 PM CDT, edward schumacher <eddiewa9gqk@...> wrote:
Sorry for so long on the reply but a lot going on here. Went back through all my notes on my HT-37 build (yes, did build one, another story). My only problem with my build occurred with original power supply problems which had increased the voltages to the VOX circuitry. After correcting those problems, the regular VOX worked as planned. I did not have a need to try the breakin mod tho knew someone who I believe did with no problems. Only suspect component I can see is C85, the .22 mfd. If it has gone leaky it would definitely shorten the circuit TC. Be sure your plate voltages meet spec as I have found at least here that Edison is closer to 130 which definitely raise transformer supplies. Hope this helps, let me know. 73 ... Ed, WA9GQK
On Thursday, March 20, 2025 at 07:05:14 PM CDT, Alan via groups.io <alancgut@...> wrote:
Hi, ? I recently did the modification for break-in keying as shown in the Hallicrafters Information Bulletin. ? I used a separate 10M pot and mounted it in the 3/8” empty hole in the back of the chassis. I installed the 4.7M fixed resistor in series and I did remove the .005mf cap from pin #8 of SO8. ? The break-in function works as advertised - counterclockwise for shorter delays. ? However, I do have one issue in that the break-in function is always on. I can not return to normal manual CW operation by turning the pot maximum clockwise as stated. ? My 10M pot actually measured 8.6M so I tried going up to a 6.8M fixed resistor and that didn’t fix the issue. I also tried a 10M fixed resistor and still had the same issue. ? I also tried substituting the V14A VOX diode 6AL5 with 3 other spares that I had here and still had the issue. ? The copy of the bulletin that I have here has a sketch that shows someone using a fixed 22M resistor in place of the normal components resulting in a 2 second delay. I find that interesting in that 22M resistance is certainly beyond the factory’s full clockwise “return to normal manual CW operation” resistance. ? Has anyone here successfully performed this modification and had if perform as described in the bulletin? Maybe I’m missing something, so I thought I’d ask here. ? Regards, Alan, W9CG |
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Re: Bobby Hallicrafters W6OZI's Hamshack Tour- 2018 Update - YouTube
开云体育TU for sharing…..! ? STAY SAFE AND STAY WELL! ? Respectfully, NJ DOH Licensed EMT;? PHTLS, AMLS, PHPEC Millenium EMS ARC N.E. BioMedical Services ARC N.E. Disaster Cycle Services ? From: [email protected] <[email protected]> On Behalf Of Jim Whartenby via groups.io
Sent: Tuesday, March 25, 2025 1:30 PM To: [email protected] Subject: [HallicraftersRadios] Bobby Hallicrafters W6OZI's Hamshack Tour- 2018 Update - YouTube ? Forwarded from another group, enjoy! Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy |
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Re: HT-37 CW Break-In Modification
Ed Out of curiosity, what voltage do you measure on the 240 volt service line, hot to hot at the circuit breaker panel?? You should read close to 240 volts.? Over 250 volts or so is a problem for your electric service provider to solve.? If one hot to neutral reads 130 vac and the other reads 110 vac then you don't have a solid neutral connection at the circuit breaker panel.?? Is your house wired with copper or aluminum wire? Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Monday, March 24, 2025 at 05:16:30 PM CDT, edward schumacher <eddiewa9gqk@...> wrote:
Sorry for so long on the reply but a lot going on here. Went back through all my notes on my HT-37 build (yes, did build one, another story). My only problem with my build occurred with original power supply problems which had increased the voltages to the VOX circuitry. After correcting those problems, the regular VOX worked as planned. I did not have a need to try the breakin mod tho knew someone who I believe did with no problems. Only suspect component I can see is C85, the .22 mfd. If it has gone leaky it would definitely shorten the circuit TC. Be sure your plate voltages meet spec as I have found at least here that Edison is closer to 130 which definitely raise transformer supplies. Hope this helps, let me know. 73 ... Ed, WA9GQK
On Thursday, March 20, 2025 at 07:05:14 PM CDT, Alan via groups.io <alancgut@...> wrote:
Hi, ? I recently did the modification for break-in keying as shown in the Hallicrafters Information Bulletin. ? I used a separate 10M pot and mounted it in the 3/8” empty hole in the back of the chassis. I installed the 4.7M fixed resistor in series and I did remove the .005mf cap from pin #8 of SO8. ? The break-in function works as advertised - counterclockwise for shorter delays. ? However, I do have one issue in that the break-in function is always on. I can not return to normal manual CW operation by turning the pot maximum clockwise as stated. ? My 10M pot actually measured 8.6M so I tried going up to a 6.8M fixed resistor and that didn’t fix the issue. I also tried a 10M fixed resistor and still had the same issue. ? I also tried substituting the V14A VOX diode 6AL5 with 3 other spares that I had here and still had the issue. ? The copy of the bulletin that I have here has a sketch that shows someone using a fixed 22M resistor in place of the normal components resulting in a 2 second delay. I find that interesting in that 22M resistance is certainly beyond the factory’s full clockwise “return to normal manual CW operation” resistance. ? Has anyone here successfully performed this modification and had if perform as described in the bulletin? Maybe I’m missing something, so I thought I’d ask here. ? Regards, Alan, W9CG |
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Re: New to Group
AFAIK, all of the hallicrafters listed below have metal front panels and are housed in metal cases.? The S-10 / SX-10 did have an optional mahogany?case that the metal case slipped into but I doubt that any were actually sold.? If the production numbers are correct, at one time I owned 1.5% of production!? That would be three of them out of some 200 reportedly made. Still have two. The 5T is an odd one.? It uses all big pin tubes so it is obviously a much earlier design.? It is either the first or fourth superhetrodyne design sold by hallicrafters. hallicrafters receiver models Information gleaned from Max de Henseler and Chuck Dachis books S-1, S-2, S-3 TRF-regen, 5 tubes, manufactured by Silver-Marshall?, 1934 S or SX-4, -5, -6 Superhetrodyne, 7 tubes, manufactured by Silver-Marshall?, 1935 S-7, 8 tubes P-P audio, made by Howard?, 1935 S-7A, Super Seven, Airline Professional Model 37, 7 tubes, made by Howard?, 1935 S-8A, 8 tubes, made by Howard?, 1935 5T, 5 tubes, manufacturer?, 1936 S or SX-9, 9 tubes, first model made by hallicrafters, first 180 degree "silver" dial, 1936 S or SX-10, 10 tubes, first 338 degree dial. 1936 S or SX-11, 11 tubes , 1936 S or SX-12, 11 tubes, 1936 S-14,? 7 tubes, 1936 SX-15,? 9 tubes, 1937 S or SX-16, 11 tubes, 1938 SX-17,? 13 tubes, 1938 SX-18,? 9 tubes, 1938 S-19,? 5 tubes, 1938 3 bands, .5-18.5mc S-19R,? 6 tubes 1939 4 bands, .5-44mc S-20,? 8 tubes, 1938 S-20R,? 9 tubes, 1941 Covered Dial S-21, 8 tubes, 1936 S-22,? 8 tubes, 1938 S-22R,? 8 tubes, 1940 Covered Dial SX-23,? 11 tubes, 1939 SX-24,? 9 tubes, 1939 SX-25,? 12 tubes, 1940 S-27,? 15 tubes, 1940 SX-28,? 15 tubes, 1940 S-29,? 9 tubes, 1940 S-30,? 6 tubes, 1940 S-31,? 9 tubes, 1940 S-31A,? 6 tubes, 1940 SX-32,? 13 tubes, 1941 S-33,? 3 tubes, 1941 RE-1, EC-6, Sky Courier, 7 tubes, aka R-100, WW2 Morale Receiver, 1942 S-35,? 14 tubes, 1942 S-36,? 15 tubes, 1945 S-37,? 14 tubes, 1945 S-38,? 6 tubes, 1946 S-38A- 38F, 5 tubes, 1946 S-39,? 9 tubes, 1945 S-40-40A, 9 tubes, 1946 Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 23, 2025 at 05:47:22 PM CDT, don Root <drootofallevil@...> wrote:
Richard, now that you mention? “curb appeal” at which model did Halli begin to emphasize appearance? Here are some features, looking at Dachis’ book: Early cabinets were wooden, dials seem to be? exposed rotating pointers over 360 degree circular scales dials , knobs along the bottom and at other places all depending on the model no. ?some front panel plates ??were flush with the cabinet front or slightly recessed or overlapping [as a rackmount] ??? The S-9/sx-9 begins the exposed rotating scale with dangling ?metal pointer The 5-T looks like the first all metal front plate panel and metal cabinet, and ??a glass protected pointer over a new styled illuminated scale? The S-14 seems to have the front rounded onto the side ?????????????????????????????????????????????????????????????????????????????????????????? The S-16 began those decorative side strips ?and an S-meter with a matching window/bezel ? for the bandspread The S-19 ?speaker began having a plastic hanging pointer and an “h” over the grille screen ? The s-20R began the recessed, and mostly covered dial The SX-23 is a strong contender when it comes to appearance? side louver strips[real louvers?] but mostly the dial cover extended out to cover the band spread and the S-meter It was not until the SX 28 until the front-upper corner was more rounded? Earlier models ?had a front panel plate which then was flush with the cabinet front or slightly recessed or overlapping [as a rackmount] ?then ?the radio front began to rap around onto the sidesetc ? ? When it comes to competitors the NC-2-40D and speaker is high on the list ? _,_ -- don??? va3drl |
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Re: New to Group
开云体育Richard, now that you mention? “curb appeal” at which model did Halli begin to emphasize appearance? Here are some features, looking at Dachis’ book: Early cabinets were wooden, dials seem to be? exposed rotating pointers over 360 degree circular scales dials , knobs along the bottom and at other places all depending on the model no. ?some front panel plates ??were flush with the cabinet front or slightly recessed or overlapping [as a rackmount] ??? The S-9/sx-9 begins the exposed rotating scale with dangling ?metal pointer The 5-T looks like the first all metal front plate panel and metal cabinet, and ??a glass protected pointer over a new styled illuminated scale? The S-14 seems to have the front rounded onto the side ?????????????????????????????????????????????????????????????????????????????????????????? The S-16 began those decorative side strips ?and an S-meter with a matching window/bezel ? for the bandspread The S-19 ?speaker began having a plastic hanging pointer and an “h” over the grille screen ? The s-20R began the recessed, and mostly covered dial The SX-23 is a strong contender when it comes to appearance? side louver strips[real louvers?] but mostly the dial cover extended out to cover the band spread and the S-meter It was not until the SX 28 until the front-upper corner was more rounded? Earlier models ?had a front panel plate which then was flush with the cabinet front or slightly recessed or overlapping [as a rackmount] ?then ?the radio front began to rap around onto the sidesetc ? ? When it comes to competitors the NC-2-40D and speaker is high on the list ? _,_ -- don??? va3drl |
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Re: New to Group
开云体育It’s also contagious, so be even more careful! ? From: [email protected] [mailto:[email protected]] On Behalf Of Paul Lemmon via groups.io
Sent: Sunday, March 23, 2025 9:49 AM To: [email protected] Subject: Re: [HallicraftersRadios] New to Group ? Welcome to the group Dan, There is an amazing wealth of information on this group but be careful, collecting can be dangerous. ?I currently have 28 Halli radios on the shelf waiting to be restored. ?My novice receiver was a SX-25 back in ‘69. ?Have fun. -- Paul _._,_._,_ -- don??? va3drl |
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Re: New to Group
开云体育
The 150 is a very fine radio. Welcome to the group.
Walt Cates, WD0GOF
?
From: [email protected] <[email protected]> on behalf of dshack@... via groups.io <dshack@...>
Sent: Saturday, March 22, 2025 3:56 PM To: [email protected] <[email protected]> Subject: Re: [HallicraftersRadios] New to Group ?
I been licensed since 1967 and was raised on Halicrafters equipment
currently have? SR-150 as that was my go to radio in the day and just walking down memory lane
the biggest joy to me is all the changes in technology in this hobby
Dan
On Saturday, March 22, 2025 at 04:47:33 p.m. EDT, waltcates via groups.io <cateswa@...> wrote:
What kind?of gear are you running??What is your biggest joy in ham radio?
Walt Cates,
WD0GOF
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A majority of acceptance is not proof of correctness.
From: [email protected] <[email protected]> on behalf of dshack@... via groups.io <dshack@...>
Sent: Saturday, March 22, 2025 10:46 AM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] New to Group ?
joined the group and want to say hello
Dan
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don Root
Jim Whartenby
Thomas K. Lanieri
waltcates