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I am considering vintage PA head.
The seller doesn't have a cabinet to test it with.

Looking at the photos it looks like the speaker terminals are octal sockets.
A little googling shows me that among other things, these where a way to allow you to plug in different impedances, e.g., common + pin-x for 4 ohm, pin-y for 8 ohm, etc.

question 1: are these octal sockets the same as the tube ones? I actually have some tube octal plugs so I could make an adapter.

question 2: as far as anyone knows, was the pin-out standardized?

the amp manfacturer is Stormberg Carlson, model AU-33

I am going to google some more to see if there an model specific docs, but if anyone has any experience I would appreciate it
 

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yes , regular octal with orientation pin ... 2 identical sockets wired in parallel ... 200 / 25/ 16/ 8 / and 4 ohms
pin 8 is ground ... 1 is 4 , 2 is 8 ....
4 and 5 are not used
 
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