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Fender® Musical Instrument
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Output Transformer Numbers & Impedances
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Model |
F. M. I. number |
Export number |
Output Impedance |
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Bandmaster 6G7A |
45217 |
--- |
4 ohms |
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Bandmaster |
022848 |
125A6A |
4 ohms |
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Bandmaster Reverb |
022848 |
125A6A |
4 ohms |
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Bassman 5F6/5F6A |
45249 |
--- |
2 ohms |
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Bassman 6G6 |
--- |
125A5A |
8 ohms |
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Bassman, other than above |
022871 |
125A13A |
4 ohms |
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Bassman 50 |
022871 |
125A13A |
4 ohms |
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Bassman 10 (combo) |
021848 |
125A13A |
8 ohms |
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Bassman 10 (head) |
013897 |
--- |
8 ohm center-tap |
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Bassman 70 |
013897 |
--- |
8 ohm center-tap |
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Bassman 100 |
021657 |
--- |
4 ohms |
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Bassman 135 |
013691 |
--- |
8 ohm center-tap |
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Bronco |
022905 |
125A35A |
3.2 ohms |
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Champ |
022905 |
125A35A |
3.2 ohms |
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Concert 6G12 |
45249 |
--- |
2 ohms |
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Concert AB763 |
022855 |
125A9A |
2 ohms |
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Deluxe 5E3 |
? |
--- |
8 ohms |
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Deluxe/Deluxe Reverb |
022640 |
125A1A |
8 ohms |
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Harvard |
--- |
125A2A |
? |
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Musicmaster Bass |
026839 |
--- |
8 ohms |
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Princeton 5B2 |
7765 |
--- |
8 ohms |
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Princeton 5F2A |
265 |
--- |
8 ohms |
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Princeton, other than above |
022913 |
125A10B |
8 ohms |
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Princeton Reverb |
022913 |
125A10B |
8 ohms |
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Pro Amp 5C5, 5D5, 5E5, 5E5-A |
1846 |
--- |
8 ohms |
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Pro AB763, 6G5A |
--- |
125A7A |
4 ohms |
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Pro Reverb, all |
022848 |
125A6A |
4 ohms |
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Quad Reverb |
022889 |
125A29A |
4 ohms |
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Quad Reverb (1978) |
013691 |
--- |
8 ohm center-tap |
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Showman 6G14 (2-5881's) |
45550 |
--- |
8 ohms |
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Showman 6G14-A (4-5881's) |
--- |
125A4A |
8 ohms |
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Single Showman (one spkr) |
022897 |
125A30A |
8 ohms |
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Dual Showman (two spkrs) |
022889 |
125A29A |
4 ohms |
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Super 6G4 |
45216 |
--- |
4
ohms |
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Super 6G4-A |
022848 |
125A6A |
4
ohms |
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Super Reverb |
022855 |
125A9A |
2 ohms |
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Super Reverb (1978) |
013897 |
--- |
8 ohm center-tap |
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Super Six Reverb (1976) |
022889 |
125A29A |
4 ohms |
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Super Six Reverb (1978) |
013691 |
--- |
8 ohm center-tap |
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Super Twin, Super Twin Reverb |
012413 |
--- |
4 ohms |
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Tremolux 5E9, 5E9-A, 5G9 |
108 |
--- |
8 ohms |
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Tremolux 6G9, 6G9-A |
45217 |
--- |
8 ohms |
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Tremolux 6G9-B, AA763, AB763 |
022848 |
125A6A |
4 ohms |
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Twin 5F8, 5F8-A,
6G8-A (4-5881's) |
45268 |
--- |
4 ohms |
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Twin 6G8 (4-6L6's) |
45548 |
--- |
4 ohms |
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Twin Reverb, all |
022889 |
125A29A |
4 ohms |
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Vibro-Champ |
022905 |
125A35A |
3.2 ohms |
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Vibrolux 6G11 |
45217 |
--- |
8 ohms |
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Vibrolux 6G11-A, AA763 |
--- |
125A7A |
8 ohms |
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Vibrolux Reverb |
022848 |
125A6A |
4 ohms |
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Vibrosonic 6G13-A ("8-ohm") |
45548 |
--- |
4 ohms |
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Vibrosonic 6G13-A ("16-ohm") |
45550 |
--- |
8 ohms |
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Vibrosonic Reverb |
022897 |
125A30A |
8 ohms |
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Vibroverb 6G16 |
--- |
125A6A |
4 ohms |
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Vibroverb AA763, AB763 |
--- |
125A7A |
8 ohms |
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Output impedances are nominal and frequency-dependent.
Many amps work with either 4 or 8 ohm loads, allowing for extension speakers.
Some blackface Fender amps use an 8-ohm, center-tapped transformer. When a
second speaker is plugged in, the transformer's center-tap
is selected, halving its output impedance to match the new, 4-ohm
load.
For more on impedance matching and cabinet wiring, check our
speaker wiring FAQ.
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Fender® is a registered trademark of
Fender® Musical Instruments Corporation.
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