Need wiring info for the Thordarson T-22S62 Universal SE Output Transformer

[Conlan]

I'm building a simple mono amplifier with a 3-pos impedance selector switch. While I could probably take a good guess by probing the six output terminals, I'd still like to be able to check my work against the Thordarson spec.

Any info would be much appreciated!

 

[HollowState]

This may not help that much but these are the specifications from the Thordarson catalog. Sorry that I don't have the connection paper supplied with the unit.

primary impedance - 1500 to 4000 ohms CT
secondary impedance - 0.1 to 30 ohms
primary MADC - 50
watts - 8

 

[rayma]

I found a schematic that uses this transformer.
See the attached Hallicrafters manual.

Red is B+
blue is plate
primary impedance 2.4k ohms

black is secondary common
yellow is 3.2 ohms
green is 8 ohms

 

[Conlan]

This may not help that much but these are the specifications from the Thordarson catalog. Sorry that I don't have the connection paper supplied with the unit.

primary impedance - 1500 to 4000 ohms CT
secondary impedance - 0.1 to 30 ohms
primary MADC - 50
watts - 8

That much I've been able to find, but I appreciate it nonetheless!

I think I've gotten pretty close figuring out the turns ratio of the primary and each secondary tap, by using a volt meter and a(n isolated) variac.

I feel very lucky to have found that the numbered taps run in series along the secondary winding, so no worries about shorting turns or mixing up phase.

Here's the data I found, for posterity:

With 100vac to the primary:

Taps 1 - 2 = 2.22vac
Taps 2 - 3 = 0.80vac
Taps 3 - 4 = 1.35vac
Taps 4 - 5 = 1.60vac
Taps 5 - 6 = 2.33vac

Taps 1 - 6 = 8.3vac (as one might expect)

Keep in mind my volt meter kind of stinks and the line voltage to the Variac isn't regulated, so these are kind of rough numbers. Still, enough to figure out which taps to use to achieve 4k on the primary with approximate 4, 8, and 16Ω taps. 1 - 3 is close enough to 4Ω, 1 - 4 is about 7.5Ω, and 2 - 6 is at least in the neighborhood of 16Ω

I won't try to post the algebra used to arrive at those figures- I'm embarrassingly rusty on the subject, and it might do more harm than good. Moral of the story is: voltage ratio is equal to the turns ratio; impedance ratio is the square of the turns ratio.

Thanks everyone who contributed a reply. If you spot any glaring mistakes in my work, please let me know. Otherwise, I think this is what I'm going to have to run with.