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Replacement for .7 to 1 interstage transformer
10-25-2020, 06:24 AM
Had a similar thread, but it wasn’t as specific as this, and therefore got lost. Anyone know a good replacement for this interstage transformer? Has a turns ratio of .7 to 1. It’s in a Sparton 28.
[Image: https://i.imgur.com/lNO85AP.jpg] 
10-25-2020, 12:04 PM
It can not be .7 to 1.
Just by the sheer DC resistance, even if accounted for the wire gauge, 700 Ohm to 1 Ohm means huge difference in the number of turns. People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
10-25-2020, 12:36 PM
Morzh,
Look at the schematic. Primary at 3580Ω, secondary center-tapped at 2985Ω (or 5970Ω total secondary). equals a turns ratio of actually .599 to one, but close enough to the rated value of .7 to 1. Am I missing something here?
10-25-2020, 12:41 PM
Morzh,
Oh, I see. Your're looking at the output transformer. I'm referring to the input or interstage transformer.
10-25-2020, 05:15 PM
Oh..yes I was looking at the output.
38-116 has a similar one. Lets' see if Tubes and More has something. Nope. They have 1:2 and 1:3. Can't see that ratio around. Maybe someone else can. People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing. 
10-25-2020, 06:03 PM
I found a 1:1.5 but that was the lowest. Did find a 1:1 but was discontinued.
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got it! Terry
10-25-2020, 06:05 PM
1:1.5 and 0.7 to 1 are close enough.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
10-25-2020, 07:13 PM
It's a Hammond 124D
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got it! Terry
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