Hey guys,.. Anyone have a schematic that can be read?? (Hali S-38E)
I have downloaded all I can find.. Can't read them..
Thanks,.. Stan

The schematic is supposed to be in Sams 605 Servicer. I don't have it.

This one looked pretty readable compared to some of the schematics we try to decipher... http://mikeyancey.com/files/S-38E/S-38E%20MKII.jpg It is a MKII though (have no idea what the difference might be).

Curtis Eickerman

Why, thank you for the link!
Yes, they're all pretty sloppy, apparently scanned (and haphazardly) in an age prior to the current one of cheap hard drive space (where size of the resulting file was more important than actually reading, or printing it).

I'm constantly on the lookout for the Hallicrafters S-38x series for scanning. If anyone has an original, I'd gladly trade round-trip postage for an opportunity to scan them.

BTW - a MKII has a small pot in the rear that you can use to adjust the CW clarity. Generally done at the factory and doesn't need 'messing with', but once you recap, you can generally tune in some 40m CW and see if you can make any signal clear without adjusting it.

Other S-38E's do not have that 15k Pot from pin 2 of the 12BA6 and are reasonably similar in all other areas.

Mike Y
KM5Z

While the above link is pretty good, I have not been able to print a completely readable copy.. This may be something on my end.. Just always seems the very section I NEED to look at is blurry.. BTW,.. Right on top of the chassis mine is marked "MARK 1"..

Stan

They definitely could have used a bigger font. I have found that some parts are a little easier to interpret "on screen" with everything blown up about 4 to 1. Even then some of it would be guesswork on values. The jpeg compression has caused some things to be tough to read no matter what.

Curtis Eickerman

I've also found that some of the schematic values don't exactly match what is in the radio.. And from what I've read, there were running changes..
Makes it all the more difficult when your just starting out , just trying to make the thing work..

Stan

Stan, you will find as you do this a little more there are component values that are not critical (bypass capacitors for example), and others that are (I.F. transformer capacitors for example).

Sometimes the important parameter is the value in micrfarads and other times the value isn't terribly critical but the voltage rating is (power supply capacitors for example).

Sometimes there are resistor capacitor decoupling arrangements that help isolate the power supply connection for each stage. In some cases the resistors and capacitors could vary 2-to-1 in value and you would never know the difference. Not in every case, but it can be that way.

Yes they also varied things in production. For example they designed a radio using a bunch of .01 bypass capacitors but one stage had .015 for no particularly good reason. Eventually someone notices that if they just let them all be .01 the radio works just fine and the production line didn't need any .015 capacitors at all anymore.

The same can happen with resistors.

Curtis Eickerman

Heck yeah - how 'bout the SX-42: there are at least 3 different 'official' schematics that I've found for it, I think.

Its so frustrating.. At this point, I'm not much more than a "recapper".. Just looking at a schematic fries my brain.. Throw in the unexpected,.. I have to get up, walk away, stress, and read everything on the net that I can find..

Stan

But I love working on these old radios..

Stan

Hey Stan. What model of s-38E are you looking for? The Mark I or II? I just got finished redoing that nasty excuse for a xeroxed, copied, xeroxed, copied, xeroxed, copied to pdf "schematic" that is floating around for the markII. Let me see if I can post it on my photo page and show a copy here.
I have also given it to http://gmcotton.com/Main.html and The-s38-Guy. I would appreciate it if anyone who knows of any other sites that host s-38E stuff such as BAMA and knows how to contact someone to post it, please share the copy there too.





Hmm....Thats less than spectacular. Is it possible to post a bigger picture from a file here? Its actually supposed to be a lot bigger and readable.

If you are looking for one for the Mark I, look on eBay under: "***LEGIBLE*** HALLICRAFTERS S-38E MARK I SERVICE DATA ON CD" That is the photo of the service data pamphlet on CD. (original copy not for sale)


As far as differences from the schematic, some sets are different. Take C33 .01 uF in the top right corner by the phones jack. That has 2 stars and in the notes it states: Used in some sets.