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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 5:40 pm 
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Mike, you're right. Four.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 5:55 pm 
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Mike C. wrote:
AJJ wrote:

Don't be in a hurry to wire in this speaker and field coil replacement yet. You still need to replace those 3 electrolytic capacitors, at the very least.


Doesn't c20 make that 4 electrolytics?


Another issue I've run into is there are at least 2 different schematics for this radio, and some of the components are numbered differently. Riders shows 3 electrolytics, C20 10uf@25V, C28 30uf@ 450, and C32 10uf@450V
Thanks
Steve
Wait a minute! There is also C29. I did not see the ditto marks. So which one is not in the can?

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Last edited by smcmanus on Aug Sat 01, 2020 6:08 pm, edited 1 time in total.

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 5:57 pm 
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Mike C. wrote:
AJJ wrote:

Don't be in a hurry to wire in this speaker and field coil replacement yet. You still need to replace those 3 electrolytic capacitors, at the very least.


Doesn't c20 make that 4 electrolytics?


The original BAMA schematic shows 4 e-caps

Yes, C28 is 30 uf, C29 and C30 are 10 uf all at 450VDC, triple unit in a can.

C20 is the cathode bypass cap. 20uf at 25 VDC single unit. Probably axial lead.

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 6:04 pm 
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Deleted:No need to repeat exactly what Paul wrote.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 6:16 pm 
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processhead wrote:
....

C20 is the cathode bypass cap. 20uf at 25 VDC single unit. Probably axial lead.


Or,it could be a 10uf at 25vdc,depends on which parts list you're looking at.Just letting OP know that he may see a different value in this position and not to let it throw him.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 6:22 pm 
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Here is a picture of the 6F6 tube base. C20 should be connected to pin 8. Is that burnt looking ceramic thing a capacitor? I thought it was a resistor.
Thanks
Steve


Attachments:
IMG_3012.JPG
IMG_3012.JPG [ 1 MiB | Viewed 108 times ]

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 6:42 pm 
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That should be the cathode resistor.Is there a wire also connected to pin 8 and running back to the 3-section can?

You have to keep in mind,that just because the schematic shows a component at a certain location,it doesn't mean that that is where it is actually located in the radio.The schematic shows the electrical relationship,not necessarily the actual physical layout.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 7:11 pm 
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smcmanus wrote:
The electrolytic capacitor can has been replaced with 10mfd/10mfd/30mfd can all at 450V. Since this was replaced, I can't be sure if it's hooked up correctly. In fact, I'm pretty sure it is not. I'll keep struggling!
Thanks
Steve

Even if it's not original, that capacitor doesn't look new.

The front panels looks like it was repainted at some point, but is peeling and rusted. Perhaps repaired/restore or whatever more than once, maybe. You're right that not to assume any prior work done is correct.

Don't know what your goals are. I think this is going to take a while to straigten everything out :)


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 7:25 pm 
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p.s.

...just a suggestion on possible path forward.

This link might help :)

https://adachi-giken.com/receiver/s20r/ ... 5112-L.JPG

(yours versus his in this part of the radio)


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his.jpg
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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 8:09 pm 
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Thanks for all the tips. I haven't done anything yet. I'm trying to figure it out before I start refurb. It does not look like this was repainted. It has been messed with though. There is no C20, only 3 part can cap.
Thanks for the pictures. That Japanese guy does nice work!
Have a nice day
Steve

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 8:33 pm 
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smcmanus wrote:
..... It does not look like this was repainted.


What's going on with the lettering on the front panel?It looks like someone masked over some of it or it looks like there's Scotch tape over some of it?

Added:It looks like that resistor isn't even soldered to pin 8 of the 6F6.They may have forgotten to replace the electrolytic after removing the old part.Someone was half-arsed,that's for sure.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sat 01, 2020 9:27 pm 
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Mike C. wrote:
smcmanus wrote:
..... It does not look like this was repainted.


What's going on with the lettering on the front panel?It looks like someone masked over some of it or it looks like there's Scotch tape over some of it?

Added:It looks like that resistor isn't even soldered to pin 8 of the 6F6.They may have forgotten to replace the electrolytic after removing the old part.Someone was half-arsed,that's for sure.


There are bits of scotch tape to keep the lettering from falling off. It hasn't been repainted, but I might.
The resistor is soldered to pin 8 and that looks old, not like the more recent bodge jobs. It doesn't look like C20 was ever there.
Have a nice day
Steve

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sun 02, 2020 4:35 pm 
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Shopping list, capacitor questions:
numbers from riders
C22 and C27 show .01mfd @ 800V, Is 630V good enough?
C20 shows 10mfd @ 25V electrolytic, BAMA shows 30 and 40 uf, and it looks like there wasn't one ever in this radio. Is a 22mfd @ 250V electrolytic good enough?
Thanks
Steve

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Sun 02, 2020 6:56 pm 
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smcmanus wrote:
Shopping list, capacitor questions:
numbers from riders
C22 and C27 show .01mfd @ 800V, Is 630V good enough?
C20 shows 10mfd @ 25V electrolytic, BAMA shows 30 and 40 uf, and it looks like there wasn't one ever in this radio. Is a 22mfd @ 250V electrolytic good enough?
Thanks
Steve


If the original manufacturer's part is 800 volts,you should stick with one that's rated for at least 800 volts.They generally didn't pay for higher rated parts if they weren't needed-especially Hallicrafters.

Anthing from 10-22uf would work just fine for C20.I wouldn't go with a 250 volt cap in that position,there's no need for it.I would imagine you're going to replace the cathode resistor at the same time,it looks beat.


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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Tue 04, 2020 2:39 pm 
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Is a ceramic disk a suitable replacement for the .01mfd 800V capacitor? Note the giant paper ,01mfd 2000V cap in the photo!
Thanks
Steve

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Tue 04, 2020 5:07 pm 
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smcmanus wrote:
Is a ceramic disk a suitable replacement for the .01mfd 800V capacitor? Note the giant paper ,01mfd 2000V cap in the photo!
Thanks
Steve


Steve, that cap should be fine.

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Thu 06, 2020 1:15 pm 
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OK, now about the 1400/1500 ohm resistor to replace the speaker field.
Must is be 10W, or could it be more, like 25 Watts?
Thanks
Steve

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 Post subject: Re: Hallicrafters S-20R
PostPosted: Aug Thu 06, 2020 3:17 pm 
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A resistors power rating can always be higher than the minimum required, just not lower.
So yes, if there is room for a 25 watt resistor and that is all you have , it is OK.

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