FW: [heathkit] Need IM-5228 VTVM Parts
Knobs and large thumbnut have been resolved. Unit is working fine and is awaiting a the installation of the battery eliminator once I receive it. What I need now is one of the switchable probes. I
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Gary Harmon
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#30959
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Re: Help Tweaking in New IF Can in S-120
Yeah, I find the alignments a bit tedious... -- Justin B. KI5GKD
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Justin Bowser - KI5GKD
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#30958
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Re: Help Tweaking in New IF Can in S-120
if i may add my 2c worth. may i assume you first, with radio off turn dial end to end to be sure pointer correctly ends up at same but opposite places on dial.? if not the first adj would to be to
By
barry marks
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#30957
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Need IM-5228 Parts
Need one of the large black knobs and one of the thumbnuts that fastens the bracket to the case. Best 73, Gary H. Harmon Jr 6003 Archwood San Antonio, TX 78239-1504 (210) 657-1549 home (210) 884-6926
By
Gary Harmon
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#30956
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Re: HT-45 Mods/Upgrades
Jim, I have a P-2000 available that I listed on this group in May 2024. Search ¡°P-2000¡± to see it or at this link
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Pat - W0YES
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#30955
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Edited
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Re: New Arrivals!
Nice finding! I worked on an SX-9 a couple years back for a friend. I was surprised at how well it performed. Enjoy! TomW3TA
By
thoyer
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#30954
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New Arrivals!
I did it again..... Went to an estate sale and 2 more Hallicrafters radios follow me home!?? Got an SX-9, and an SX-42.? the 9 plays quite nicely as found (newer power cord, and it was found
By
Howard
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#30953
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Re: Gold Halli logos wanted for S-14 and 5-T
One of them , the 5T or the S14, had a faded gold emblem.? Must have been the more recently restored S14 if I began this pursuit when wrapping that one up.? Now that you mention it, the other was
By
Daniel K1DTS
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#30952
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
Halden, I have been wondering about the HV winding wire size{S}. From your ¡°stuff¡± I would say ¡°the turns near the Center Tap need to feed B+ current and B++ current so must be thicker, while
By
don Root
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#30951
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
A clarification to my post 30946: By "inner" and "outer" I meant from the perspective of the winding's schematic.? The wire between the HV taps and "B+" taps has higher resistance per volt developed
By
HF
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#30950
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
Thanks for the comments, everyone! I don't think the dielectric constant of material in the gap matters much here, but dielectric strength does.? At 2000V, I get a spark across the gap.? If the
By
HF
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#30949
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Re: Gold Halli logos wanted for S-14 and 5-T
I have two 5-Ts , one with the later dial type, but the logo is not present (front panel has been repainted) and an unrestored 5-T Sky Buddy (Radio Boy dial) with the original Hallicrafters logo
By
caladonia5560
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#30948
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
It is doubtful that the wire gauge for the high voltage secondary is different below the center tap then above it.? As the winding progresses from the lowest level to the highest, the length per turn
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Jim Whartenby
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#30947
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
Some more information about this transformer's arc-through injury: I used resistance measurement between the arc site and the HV winding terminals to estimate where on the HV winding the arc-through
By
HF
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#30946
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
As a suggestion, try contacting Heyboer Transformers in Grand Haven Mich to see if they can rewind the transformer? Contact Heyboer Transformers <https://www.heyboertransformers.com/contact.shtml> 73
By
Mike
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#30945
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
An update: I'm going try to keep the filament winding.? I was able to loosen 3 filament winding turns.? Between the time I posted the message with the 3 photos and when it appeared here, I posted a
By
HF
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#30944
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Edited
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
Jim,I thought this had died.? Seems that the fellow would be better off rewinding the transformer with new and better insulation wire, I doubt that the RTV will do what he intends. Still real dampish
By
robert meadows
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#30943
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Edited
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
HaldenWhat is the dielectric strength of the RTV that you plan to use??? Dow 3120 has a rating of 457kV per inch so this may not be good enough to prevent another punch through in the same
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Jim Whartenby
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#30942
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Edited
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Locked
Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY
I further opened up the transformer that Randy donated for the cause, in preparation for removing the ¡°YEL¡± 5V winding to look for the arc path between it and the HV winding. Once I got tape off
By
HF
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#30941
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Edited
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Re: Gold Halli logos wanted for S-14 and 5-T
Looks good!? I am getting ready to dig out my ALPS printer and make some decals and I think I have some gold foil ribbons so I might try this. 73, -- Justin B. KI5GKD
By
Justin Bowser - KI5GKD
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#30940
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