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Author Topic: Motorola transformer 25B880553 ID  (Read 344 times)
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Patrick J. / KD5OEI
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« on: June 01, 2024, 03:56:05 AM »

Here's one for those who have messed with or parted out old Motorola stuff

The small black end-bell type transformer has "25B880553" stamped into one end bell and "6AK6 output" written in machinist chalk pencil on the other one. I have found Motorola part numbers like this, but with a dash instead of the letter as in 25-880553, but no joy on the part number either way.

Has anyone an idea what this might have been used in?

I'm not too familiar with it but I think it is from the 50s.

I realize this is off track but a 6AK6 can make 1W, so at lower power levels it could be a good line output.
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Radio Candelstein
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« Reply #1 on: June 03, 2024, 08:08:21 PM »

The letter is used by the factory only, but when you would order a part from Motorola you would put a dash where the letter was.  For example, a manual would have a part number on it of 68P8xxxx etc. but when you would order it you would write it as 68-8xxxx.  Useless trivia today.

I have old parts pricing books indexed by part number but they have no useful info. All it will say is "Transformer" and a price.  The transformers are more specifically described in the equipment manuals, but there are thousands of those and it would be a herculean effort to find it that way without better clues.  I also think the Motorola consumer equipment division may have used the same style part numbers.
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Geoff Fors
Monterey, California
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