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 What is this?
What are the peaks? Are they tube voltages?
This off my S38 Sams Can't make out the numbers V? V1 V2 V? V4
Every ham should be honey baked and spiral sliced
You know you're a Texan when Whataburger is pronounced Waterburger
Lake between Montrose and Ridgway Colo
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That is how the filaments for tubes are drawn. The numbers are tube pin numbers. The first one is V3. Tubes are (were) labeled using V indicating tubes. In your case, most likely V3, V1, V2, V5 and V4. They are series string filaments, adding up to approximately 110V in the old days. Get your voltmeter our and (with the radio unplugged, bug from the switch to each tube, to verify which one is the first one. Whether it be V5 or V3, this will tell you.
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So that is why the rectifier tube 35Z5GL isn't listed? It is supplying the filament voltage for the other five. Kool and thx
73
Bill
Every ham should be honey baked and spiral sliced
You know you're a Texan when Whataburger is pronounced Waterburger
Lake between Montrose and Ridgway Colo
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Look like an old "All American Five" AC/DC transformerless radio. We used to call those "Widow Makers."
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The 35Z5 is a rectifier that provides high voltage for the radio. The AC line provides the voltages for ALL the filaments ... as I said they are in series.
Correct Steve ... them things hurt if you grab the case with the plug in backwards.
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 Originally Posted by W5WPL
So that is why the rectifier tube 35Z5GL isn't listed? It is supplying the filament voltage for the other five. Kool and thx
73
Bill
The filament voltage is not part of the rectified output. The filiaments are all in series, the rectifier filament is one of those tubes listed. It has a 35v filament voltage. The first two numbers of the tube type designate the voltage of the filament. If you add them all together, you will have approx 110-120v, so the filaments, in series as shown, run directly from the 110v AC source. No transformers required this way, making the radio lighter and smaller (and less costly).
Joe
We cannot tax our way to prosperity.
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Okay, thanks so much for the info. This is a six tubed S-38. I wonder why Sams didn't list all six tubes.???
Again,, Thx
Bill
Every ham should be honey baked and spiral sliced
You know you're a Texan when Whataburger is pronounced Waterburger
Lake between Montrose and Ridgway Colo
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The S-38 they documented may have only been a Five tube radio.
The Sam's Photofact series relied on the manufacturer to give them a radio which they then documented.
Yes they do make mistakes so does Yaesu and others.
Yaesu comes to mind because of the errors in the FRG-7 manual.
73,
Sue
AF6LJ
Conspiracy Theorists Are People
Who Question The Statements Made By Known Liars.
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Originally Posted by W5WPL
Okay, thanks so much for the info. This is a six tubed S-38. I wonder why Sams didn't list all six tubes.???
Again,, Thx
Bill
I know there were different versions of the S-38, but I had an S-38B model and it has only five tubes.
The whole manual for that model is here and it also shows only five tubes:
http://www.km5z.us/files/S-38B/S-38B_Operating.pdf
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I should have given this part of the schematic. It shows the filaments for the 35Z5GT
Here's another picture from my bench. 6 of those bad boys
Every ham should be honey baked and spiral sliced
You know you're a Texan when Whataburger is pronounced Waterburger
Lake between Montrose and Ridgway Colo
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