Zenith Console Stereo amp

[Cygnus X1]

I know this is way off the beaten path of the guitar amps we know and love...but the well is so deep here I hope someone can answer a simple question.

I bought a little stereo amp in a bulk buy, it's a Zenith 5K29 and I want to fire it up but am not comfortable with just what the speaker impedance is.
Looks like 75 ohms!

Schem is attached.

[Dr-Joned]

That almost looks like .75 ohms. I would Verify the ratio on those transformers using a small AC supply. You could buy some inexpensive iron to replace it.

I have often thought about trying a small "stereo" rig using a slight delay between the cabs. Looks like fun !

[passfan]

Looks like a single ended stereo amp. If you look close there appears to be a decimal point perhaps indicating the resistance of the secondary winding. I'm seeing .75 ohms on the secondary.

[Cygnus X1]

That doesn't even seem possible.

Does it?

Came out of a 1961 console with the speakers as indicated on the schem.
They made speakers that would show a .75 ohm load?

[passfan]

That doesn't even seem possible.

Does it?

Came out of a 1961 console with the speakers as indicated on the schem.
They made speakers that would show a .75 ohm load?

It's the actual resistance of the winding, and on the primary side is the resistance of that winding; 675 ohms. The drawing is not showing the output impedance but the winding resistance. As Dr-Joned stated 120 volt ac applied to the winding will give you the ratio when you measure the ac voltage on the secondary. You can then see what the primary impedance will be for any given secondary impedance. Say we have an 8 ohm impedance, plug that into the ratio equation and it will give you the primary K for that output load.