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 Post subject: Hallicrafters SW-500 Schematic
PostPosted: Nov Mon 05, 2012 3:39 am 
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Joined: Dec Sat 22, 2007 7:12 am
Posts: 2264
Location: Great State of Texas!
Dear Fellow Radioheads- Got lucky and rescued an all original SW-500 today from the dumpster. It looks EXACTLY like an S-120, down to the Selenium Rectumfier;) Can I use the S-120 schematic and if not, does anybody have the schematic? Noticed already that the SW-500 has a 5 section electrolytic of 60/40/40/40 mF at 150 and a 20 mF at 25 VDC, whereas the S-120 has a 4 section electrolytic of 60/40/40 mF at 150 and a 20 mF at 25 VDC. IIRC, I used a 1N4007 silicon rectifier with a 10W 100 ohm rated resistor when replacing the selenium rectifier on my S-120. Gonna have to check my old posts for that, but appreciate any feedback, especially the schematic! Does anybody know the max rated filament string voltage? Don't want to start any selenium rectifier riots, but do want to change it out! According to Chuck Dachis's book, "Radios by Hallicrafters", the SW-500 " is identical in every way to the S-120 except for the color of lower portion of the front panel"-Strange!-Gearhead


UPDATE: Discovered a 5W 100 ohm ceramic resistor in my pile o' parts. Can I use this instead of a 10W in series with the 1N4007 silicon rectifier? FWIW, the S-120 is rated at a power consumption at 30 watts.

UPDATE #2: My one spare 1N4007 tested bad:( All that Radio Crap advertises in store are GP15M Rectifier Diodes (3 pack) that are supposedly rated at 1000 PIV and 1.5 Amps.


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 Post subject: Re: Hallicrafters SW-500 Schematic
PostPosted: Nov Mon 05, 2012 8:59 pm 
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Joined: Dec Sat 22, 2007 7:12 am
Posts: 2264
Location: Great State of Texas!
UPDATE #3!
Good ol' Frys is outta caps again:(. Can I sub two 33 mF in parallel for the 60 mF and use 3-33 mF for the 40 mF caps? Again, am going to use a 1000 PIV and 1.5A rated Silicon Rectifier with a 10W 100 ohm resistor to replace the selenium rectumfier. Thanx for any info:)-John


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 Post subject: Re: Hallicrafters SW-500 Schematic
PostPosted: Nov Mon 05, 2012 9:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20641
Location: Detroit, MI USA
The schematic is exactly the same as the S-120.

I just looked at one of the SW-500's last week and it had all 47uf electrolytics in it as replacements, apparently done in the 90's if I can believe the date codes on them, and it worked fine with no hum so I left it alone. They did not add another series resistor and B+ voltage was about 149 volts at the first electrolytic after the tubes were warmed up. Higher than original spec, but worked OK.

Your proposal to use two 33's should be OK for the 60, but it usually isn't a good idea to reduce the size of electrolytics in the case of using a 33 to replace each of the 40's. It would probably work though.

_________________
Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Hallicrafters SW-500 Schematic
PostPosted: Nov Wed 07, 2012 4:58 am 
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Joined: Dec Sat 22, 2007 7:12 am
Posts: 2264
Location: Great State of Texas!
Thanx Mr. Detrola! Will keep you updated after Fry's delivers on the backordered 47 mF caps:)-Gearhead


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