April 24, 2024
Dynaco Audio Transformer Mark III 6550 KT88 A-431
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Up for Auction Dynaco Audio Output transformer A-431. Was used in Dynaco Mark III power amp. I am listing all my old Dynaco Parts to clean up the Garage. This transformer had been removed from an Mark III chassis. It is guaranteed to work or your money back.As you can see from the pictures there is no rust on the laminations and some scratches on the housing. The leeds feel a little stiff and the colors are faded.This transformer would also be great for a project amp with push pull output using the 6550 or KT88 output tubes.You can download the old manual with the hook-up diagram here:/dynaco/Misc/Transformers.pdfI measured the primary and secondary windings with my digital ohm-meter with the following results:INPUT PRIMARYRed to green: 22 ohmRed to green/white 26 ohmRed to blue 65 ohmRed to blue/white 76 ohmOUTPUT SECONDARYBlack to orange 0.4 ohmBlack to yellow 0.6 ohmTurned my ohmmeter to the 20 meg-ohm scale and measured resistance of all leads to ground. All checked infinite which is good. This item will be shipped USPS Priority Flat rate box for $14.95International shipping will be charges at actual cost depending on Country and service requested.
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