Philips amplifier 22AH309/00 : which kind of output connection is this?

Dear Community

I own a Philips lab stereo with amplifier model “Philips 22AH309/00”
Now, on the front of the amplifier, I can select 2 outputs/speakers: A or B.
I always connected a couple of speakers inserting the speaker pins in the A plug (see the attached image)

But I’m wondering: which kind of connection is the one marked with B? I never seen it before.
How do I plug speakers in to that B plug?
And if I do, will I be able to play on 4 speakers at the same time?

I tried to surf the web for this, but not even knowing the name of that input, it’s a hard search...

Thanks!

Marco
 

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These are DIN 'Philips' connectors seen in older amplifiers.
You need these plugs to connect and the small round pin is the positive terminal.
Still easily available.

Philips.jpg


If the A and B switches on the front can be activated simultaneously, you can connect 4 speakers that will play together in turn.
 
The Service Manual ( on HiFiEngine) mentions a load impedance of 4-16 ohms, so I’d suspect that you can connect two 8 ohm speaker pairs simultaneously. Output power is specified as 70W into 4 ohms.

IMG_1523.jpeg
 
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