Kolster K-20 A.F. Transformer - Printable Version

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+--- Thread: Kolster K-20 A.F. Transformer (/showthread.php?tid=17383)

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Kolster K-20 A.F. Transformer - dseverson - 10-10-2017

Hello, all.

Tried posting this on another site but didn't get any responses. Since I've always had good luck here, I thought I'd ask another newbie question: is anyone able to tell me what size A.F. transformers are used in a Kolster K-20? They are marked AFT1 and AFT2 on the schematic which can be found here:

http://www.nostalgiaair.org/pagesbymodel/092/M0040092.pdf

Thank you in advance for any help.

Dave

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RE: Kolster K-20 A.F. Transformer - dseverson - 10-10-2017

Perhaps a couple universal output transformers like the P-T291 from AES?

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RE: Kolster K-20 A.F. Transformer - Radioroslyn - 10-10-2017

Hi Dave,
>able to tell me what size A.F. transformers are used in a Kolster K-20?
I'm not sure I understand what you are asking. Are you referring to physical size?? Or electrical equivalent??

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RE: Kolster K-20 A.F. Transformer - dseverson - 10-10-2017

Electrical equivalent

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RE: Kolster K-20 A.F. Transformer - Radioroslyn - 10-10-2017

Ok What you are looking for are https://www.tubesandmore.com/products/transformer-audio-interstage-10-ma  for both. If the transformers are enclosed and have a 1/2" core you can buy just the replacement winding.

GL

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RE: Kolster K-20 A.F. Transformer - Arran - 10-10-2017

Other then the generic AES transformer you could try an Edcor one, or try the solid state substitute circuit that was featured in the A.W.A Old Timer's Bulletin about ten years ago, I think it's posted online somewhere.
Regards
Arran

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RE: Kolster K-20 A.F. Transformer - dseverson - 10-10-2017

Thank you for the help.

Dave

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