The Transformers (robots in disguise)

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I think 

I need a transformer for an upcoming chapter in the book I have been working through
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I remember this artifact having 12v outlets on the back
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Open it up looks good  You cannot view this attachment.

But testing is disappointing
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But there are two 12v outlets on the back right gotta be a way to get 24v but I look and they are wired in parallel (?) 

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Have I been defeated by decepticons 

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Yes.  Decepticonned.   
That is a single 12VAC winding, with 2 sets of jacks.
But you need a center-tapped winding (6-0-6 or 12-0-12 VAC).
If there were 2 there you could have run them in series to make the 12-0-12 which is probably what you were thinking of.

You could use a couple wall-wart adaptors but you need AC and they are usually DC.

[Tassieviking]

Sounds like you need a multi tap transformer with several outputs.
0V
6V
12V
24V

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Thank you sir
I looked some more at the text and maybe a 12-0-12 will do it.

I have the carcass of a crate mx10 no speaker I'm trying to find the specs without butchering it.

I was in a pickle about some transformers having more than two primary wires maybe it's for 120 vs 240

 Optimus Prime is laughing 

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Actually I don't even think it needs to be 12-0-12 I looked at the exercises and all they have me doing is inputting different Vp-p from every permutation of terminals calculating and the measuring

Which I have one I don't recall the voltage ⚡ but it has two green wires then a green/yellow

 

[Tassieviking]

Check any wire to earth before you do anything, as in the metal of the transformer.
Do some ohm readings and you should be able to work it out, if you have a variac then connect it and slowly bring the voltage up while you measure the other end of the transformer.

Some transformers have 2 primary windings at 110V each, you can run them in series for 220V or in parallel for 110V.
Some have a primary with multiple voltage taps so you can select the correct voltage for where you live. (100V, 110V, 120V, 220V, 230V, 240V)

I have never seen a schematic for a crate MX10 amp, I have seen them for the MX15R and some other low watt models.
See if these will help you work it out:

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Thank you sir
You are and have always been one of the most proficient procurers of schematics ever