Transformer - Hammond, Radiola III-A Replacement Audio

Transformer - Hammond, Radiola III-A Replacement Audio

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Developed in response to requests from RCA Radiola III-A collectors. The original transformers are usually found with open windings due to the fine wire and high turns used coupled with age. This is a universal replacement type - it will replace any of the three audio transformers used (1st audio driver, 2nd audio-phase splitter stage, or output transformer) by correctly connecting the 5 lugs. A pin out and connection diagram is included. The cases from the old transformer will fit this new unit. The terminal board is a duplicate of the original.

Key Features

  • Primary: 4000 turns, #41 wire (lugs 4 & 2)
  • Secondary: 12000 turns C.T., #41 wire (lugs 5 & 1lug 3 is C.T. connection)
  • Termination: Solder lugs on a 1 ¾" x 1" terminal board with 4-5" connecting leads
  • Size: 1-⅞" long x 1-~\frac{11}{16}~" wide x 1-⅜" deep
  • Lamination Core Size: ⅝" x ½"
  • Weight: 7 oz.
RoHS Compliant
Item ID:
Hammond Part Number:
Product Measurements by Type
Depth1.375 in.
Item Length1.875 in.
Item Width1.6875 in.
Lamination Core Size0.625 in. × 0.5 in.
Plate Length1.750 in.
Plate Width1.063 in.
Primary4000 turns, #41 wire (lugs 4 & 2)
Secondary12,000 turns C.T., #41 wire (lugs 5 & 1, lug 3 is C.T. connection)
TerminationSolder lugs on a 1.75 in. × 1 in. terminal board with 4 - 5 in. connecting leads
Packaging Information
Packaging Dimensions3.8 in. × 2.3 in. × 2.4 in.
Weight (Packaging)0.526 lbs.

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Specifications, Files, and Documents

PNG: Specification Sheet Specification Sheet26.29 KB

Questions and Answers

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Asked by Anonymous on November 6th, 2019.
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Product Reviews

5.00 out of 5 based on 5 reviews
- September 22nd, 2019
5 out of 5

Excellent Thank you

- June 23rd, 2019
5 out of 5

highly reccommended purchase, fluent communication with the manufacture. In less than 3 days the ítem was delivered.

- July 26th, 2018
5 out of 5

I've used these in Atwater Kent models like 40, and 45 with great results. I had to de-pot the old ones and grind down the corners of the new transformer to install them but it was worth it.

- August 20th, 2014
5 out of 5

This is an almost perfect replacement for the original Radiola IIIA transformer (not the same color but excellent fit); I have also used it for the Westinghouse RADA-while not a "perfect" fit it will not require modification of any kind and works quite well-a purist would complain but now I have a working 93 year old radio.

- July 8th, 2014
5 out of 5

Worked and fit perfectly in my Radiola IIIA and for a reasonable price.