Hammond 118944 RCA Radiola III-A Replacement Interstage Transformer
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Create Free Business AccountKey Features
- Replacement interstage transformer for RCA Radiola 111-A / III-A
- Universal: replaces any of the 3 audio transformers via the 5 lugs
- Primary 4,000 turns, #41 wire; secondary 12,000 turns C.T., #41 wire
- Terminal board duplicates the original; pin-out and connection diagram included
- Fits the original transformer cases; mounts using the existing case
- Compact 1.88 x 1.69 x 1.38 in (48 x 43 x 35 mm)
- REACH and RoHS compliant
The 118944 is a replacement interstage audio transformer for the RCA Radiola 111-A (III-A). It was developed in response to requests from Radiola III-A collectors, because the original transformers are usually found with open windings, a result of the fine wire and high turns used, combined with age. The design has been brought back and is again offered to collectors and restorers of antique radio equipment.
It is a universal replacement type: by connecting its 5 lugs correctly, it will replace any of the 3 audio transformers used in the set, whether the 1st audio driver, the second audio phase splitter stage or the output transformer. A pin-out and connection diagram is included.
- Primary: 4,000 turns of #41 wire (lugs 4 and 2)
- Secondary: 12,000 turns, centre tapped, #41 wire (lugs 5 and 1, lug 3 is the C.T. connection)
- Termination: solder lugs on a 1 3/4 in x 1 in terminal board with 4 connecting leads of 5 in
Overall dimensions are 1.88 in (48 mm) high, 1.69 in (43 mm) wide and 1.38 in (35 mm) deep, with a lamination core size of 0.62 in (16 mm) x 0.50 in (13 mm). The unit is listed at 0.44 lbs, with a shipping weight of 0.55 lbs (0.25 kg).
Mounting uses the existing case: the cases from the old transformer fit this new unit, and the included terminal board duplicates the original. The 118944 is REACH and RoHS compliant.
Ideal For
- RCA Radiola III-A restoration
- Replacing open-winding audio transformers
- 1st audio driver, phase splitter or output stage replacement
- Antique radio collecting
Overview
| Series | 118944 Series - Radiola Replacement Transformer |
| Replaces | RCA Radiola 111-A, III-A audio transformers (1st audio driver, second audio phase splitter stage or output transformer) |
| Product Type | Interstage transformer, replacement |
| Short Description | INTERSTAGE TX RADIOLA 111-A |
Dimensions
| Depth | 1.38 in (35 mm) |
| Width | 1.69 in (43 mm) |
| Height | 1.88 in (48 mm) |
| Weight (Spec Table) | 0.44 lbs |
| Lamination Core Size | 0.62 in (16 mm) x 0.50 in (13 mm) |
Electrical
| Primary Turns | 4000, #41 wire (lugs 4 & 2) |
| Number Of Lugs | 5 |
| Secondary Turns | 12000 C.T., #41 wire (lugs 5 & 1, lug 3 is a center tap) |
Identifiers
| UPC | 623980108827 |
| UNSPSC | 39121301 |
| Part Number | 118944 |
| Drawing Number | EDB118944 |
Packaging & Shipping
| Shipping Weight | 0.55 lbs (0.25 kg) |
Construction & Finish
| Included | Pin out and connection diagram |
| Mounting | Uses existing case |
| Termination | Solder lugs on a 1 3/4" x 1" terminal board with 4 - 5" connecting leads |
| Terminal Board | Included; duplicate of the original |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Which Radiola transformers can the 118944 replace?▾
Any of the 3 audio transformers used: the 1st audio driver, the second audio phase splitter stage or the output transformer, by correctly connecting the 5 lugs.
Will it fit in the original transformer case?▾
Yes. The cases from the old transformer fit this new unit, and mounting uses the existing case.
What are the winding details?▾
Primary: 4,000 turns of #41 wire on lugs 4 and 2. Secondary: 12,000 turns centre tapped, #41 wire, on lugs 5 and 1, with lug 3 as the C.T. connection.
Is a wiring diagram included?▾
Yes. A pin-out and connection diagram is included, along with a terminal board that duplicates the original.
Why do the original transformers need replacing?▾
The originals are usually found with open windings due to the fine wire and high turns used, coupled with age.
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