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Home » Applications & Technologies » Amplifier Power Transformer Replacement Parts Electronics
Applications & Technologies

Amplifier Power Transformer Replacement Parts

A damaged amplifier is an obvious reason for changing parts out. Another reason is for aesthetics in tone. There's a lot of iron in a power transformer, so these tend to be the most expensive part in an amp and thus can potentially be the weakest link in the signal chain that contributes to quality and tone…. if manufacturers skimp on the power transformer (which equates to less iron, less cost, less weight, and lower shipping charges.) Another reason to change out a power transformer is to fix damaged that can be caused by gross under loading and impedance mis-matching, among other things. Note that power transformers can carry dangerous levels of electrical power, so careful precaution in replacing one is not only smart, but can prevent serious injury or even death.

Part Number Decscription/Equivalent Primary Amp Manufacturer Amp Models
290AX Replacement Power Transformers for 125P1B&022772 120 VAC 60 Hz. Fender Champ, Vibro Champ, Princeton, Princeton Reverb, Tweed Deluxe
291AX Upgrade for 290AX 120 VAC 60 Hz. Fender Champ, Vibro Champ, Princeton, Princeton Reverb, Tweed Deluxe
290AEX Same as 290AX except 240 VAC & 50 Hz. Primary, 240 VAC 50 Hz. Fender Champ, Vibro Champ, Princeton, Princeton Reverb, Tweed Deluxe
290CAX UNIVERSAL 290AX Pri: Dual Voltage - 50/60 Hz Sec: 630 VAC or 550 VAC 120 or 240 VAC 50/60 Hz. Fender Champ, Harvard, Vibrolux Tweed
290BX Replacement Power Transformers for 125P23D & 041316 120 VAC 60 Hz. Fender Deluxe, Deluxe Reverb
291BX Upgrade for 290BX 120 VAC 60 Hz. Fender Deluxe, Deluxe Reverb
290BEX Same as 290BX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Deluxe, Deluxe Reverb
291BEX UPGRADE Same as 291BX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Deluxe, Deluxe Reverb
290CX Replacement Power Transformers for 125P26A & 022723 120 VAC 60 Hz. Fender Vibrolux, Vibrolux Reverb, Tremolux
291CX UPGRADE for 290CX 120 VAC 60 Hz. Fender Vibrolux, Vibrolux Reverb, Tremolux
290CEX Same as 290CX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Vibrolux, Vibrolux Reverb, Tremolux
291CEX UPGRADE Same as 291CX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Vibrolux, Vibrolux Reverb, Tremolux
290DX Replacement Power Transformers for 125P5D & 022798 120 VAC 60 Hz. Fender Super Reverb, Pro Reverb, Bandmaster Reverb, Tweed Bassman
291DX UPGRADE for 290DX 120 VAC 60 Hz. Fender Super Reverb, Pro Reverb, Bandmaster Reverb, Tweed Bassman
290DEX Same as 290DX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Super Reverb, Pro Reverb, Bandmaster Reverb, Tweed Bassman
291DEX UPGRADE Same as 291DX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Super Reverb, Pro Reverb, Bandmaster Reverb, Tweed Bassman
290EX Replacement Power Transformers for 125P7D & 022814 120 VAC 60 Hz. Fender Bassman, Concert, Pro
291EX UPGRADE for 290EX 120 VAC 60 Hz. Fender Bassman, Concert, Pro
290EEX Same as 290EX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Bassman, Concert, Pro
291EEX UPGRADE Same as 291EX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Bassman, Concert, Pro
290RX 26477 120 VAC 60 Hz. Fender Tone Master
290SX 26554 120 VAC 60 Hz. Fender Vibro King
290TX 36483 120 VAC 60 Hz. Fender 59 Bassman - Reissue
290UX 36958 120 VAC 60 Hz. Fender Hot Rod Deluxe
290VX 41752 120 VAC 60 Hz. Fender Hot Rod DeVille
290WX 47609 120 VAC 60 Hz. Fender Stand Alone Reverb - 1963
290XX 49967 120 VAC 60 Hz. Fender Blues Junior
290XEX Same as 290XX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Blues Junior
290YX 13895 120 VAC 60 Hz. Fender Fender 75
290YEX Same as 290YX except 240 VAC & 50 Hz. Primary 240 VAC 50 Hz. Fender Fender 75
290MX Power Transformers VOX Replacement AC30 Reissue 120/240 VAC 50/60 Hz. VOX AC30 Reissue
290NX Power Transformers VOX Replacement AC30 Reissue 120/240 VAC 50/60 Hz. VOX AC30 Reissue
290PX Power Transformers VOX Replacement AC30 Reissue 120/240 VAC 50/60 Hz. VOX AC30 Reissue
290GX Power Transformers Marshall Replacement 120/220/240 VAC 50/60 Hz. Marshall JCM 800, JMP - 50 watt
290HX Power Transformers Marshall Replacement 120/220/240 VAC 50/60 Hz. Marshall JCM 800 & JMP - 100 watt
290KX Power Transformers Marshall Replacement 120/240 VAC 50/60 Hz. Marshall JCM 900 - 50 watt
290JX Power Transformers Marshall Replacement 120/240 VAC 50/60 Hz. Marshall JCM 900 - 100 watt
290LX Power Transformers Marshall Replacement 120/240 VAC 50/60 Hz. Marshall JTM 45
290QX Power Transformers Marshall Replacement 120/240 VAC 50/60 Hz. Marshall JTM30

The last item in the signal chain of the audio path of a push-pull type guitar amplifier is the output transformer. The signal runs through the output transformer before exiting the speaker. This transformer is a large blocky metal device mounted on the chassis of a guitar amplifier. This transformer converts the low current (and high voltage) signal to a low-voltage (and high current) signal that powers the speakers. The output transformer literally transforms, or transfers, the audio power of the amplifier onto a load (impedance) of the speaker; how efficiently it does this is one measure of quality and the modernity of technology and materials used. The speaker is thus driven, and literally transforms the signal from electrical into vibrational-mechanical signals through the air.

Part Number Primary (Ohms) Amp Manufacturer Amp Models Power (Watts) Secondary (Ohms) Amp Type Equivalent Plastic Bobbin/Paper Wound Coil
1750A 22800 Fender Reverb Driver (Replacement for all Fender amps with reverb) 3.5 8 Singal Ended 125A20B & 022921 Bobbin
1750C 7000 Fender Champ, Vibro-Champ, Bronco 5 3.2 Singal Ended 125A35A & 022905 Bobbin
1760C 7000 Fender Champ, Vibro-Champ, Bronco 5 Upgrade 3.2 ,8, 16 Singal Ended 125A35A & 022905 Bobbin
1750E 8,000 C.T. Fender Princeton Reverb, Tweed Deluxe 15 8 Push-Pull 125A10B & 022913 Bobbin
1760E 8,000 C.T. Fender Princeton Reverb, Tweed Deluxe 15 Upgrade 4, 8, 16 Push-Pull 125A10B & 022913 Bobbin
1750F 6,950 C.T. Fender Blues Junior 15 8 Push-Pull 49969 Paper
1760F 6,950 C.T. Fender Blues Junior 15 Upgrade 4, 8, 16 Push-Pull 49969 Paper
1750H 6,600 C.T. Fender Deluxe, Deluxe Reverb 20 8 Push-Pull 125A1A & 022640 Paper
1760H 6,600 C.T. Fender Deluxe, Deluxe Reverb 20 Upgrade 4, 8, 16 Push-Pull 125A1A & 022640 Paper
1750J 4,000 C.T. Fender Pro-Reverb, Tremolux, Vibrolux 35 4 Push-Pull 125A6A & 022848 Bobbin
1760J 4,000 C.T. Fender Pro-Reverb, Tremolux, Vibrolux 35 Upgrade 4, 8, 16 Push-Pull 125A6A & 022848 Bobbin
1750K 4,000 C.T. Fender Tweed Bassman, Super Reverb 50 2 Push-Pull 125A9A & 022855 Paper
1760K 4,000 C.T. Fender Tweed Bassman, Super Reverb 50 Upgrade 2, 4, 8 Push-Pull 125A9A & 022855 Paper
1750KA 4,150 C.T. Fender '59 Bassman 50 2 Push-Pull 36485 Paper
1750L 4,200 C.T. Fender Bassman 50 4 Push-Pull 125A13A & 022871 Paper
1760L 4,200 C.T. Fender Bassman 50 Upgrade 4, 8, 16 Push-Pull 125A13A & 022871 Paper
1750M 4,200 C.T. Fender General Replacement 50 2, 4, 8 Push-Pull 125A13A & 022871 Paper
1750W 2,000 C.T. Fender Dual Showman, Twin Reverb 100 4 Push-Pull 125A29A & 022889 Paper
1760W 2,000 C.T. Fender Dual Showman, Twin Reverb 100 Upgrade 4, 8, 16 Push-Pull 125A29A & 022889 Paper
1750NA 6,000 C.T. Marshall JTM30 30 8, 16 Push-Pull Bobbin
1750N 3,200 C.T. Marshall JMP, JCM 800 50 4, 8, 16 Push-Pull Bobbin
1750U 1,700 C.T. Marshall JMP, JCM 800 100 4, 8, 16 Push-Pull Bobbin
1750Q 7,371 C.T. Marshall JTM 45 50 4, 8, 16 Push-Pull Bobbin
1750P 126, 500, 2,000 Marshall JCM 900 50 2, 4, 8, 16 Push-Pull Bobbin
1750X 126, 500, 2,000 Marshall JCM 900 100 2, 4, 8, 16 Push-Pull Bobbin
1750Y 6,300 C.T. VOX AC15 15 8 Push-Pull Bobbin
1750V 4,000 C.T. VOX AC30 Vintage 30 8, 16 Push-Pull Paper
1750T 4,000 C.T. VOX AC30 Reissue 30 8, 16 Push-Pull Bobbin
1750G 3,800 C.T. Yorkville/Traynor General Replacement 50 4, 8, 16 Push-Pull Paper
1750R 2,000 C.T. Yorkville/Traynor General Replacement 100 4, 8, 16 Push-Pull Paper

A choke is a toroid, or an inductor, used to filter out unwanted noise and alternating current. In a guitar amplifier, a choke is used to smooth out the ripples from the power supply’s rectified DC power output. It looks something like a transformer, with two leads coming out of the housing. Some guitar amplifiers use a resistor instead of a choke to accomplish similar results and to save money, but a resistor doesn’t eliminate as much AC ripple as a choke. This causes additional residual hum in the amplifier, so a choke is a better choice if quality of sound is a concern.

Part Number Decscription/Equivalent Amp Manufacturer Amp Models
194A Inductance +/- 15% - 4 H / D.C. Current - 50 ma. / Equivalent To Mfg'ers Part Number - 125C3A & 022707 Fender Deluxe, Deluxe Reverb, Vibrolux, Vibrolux Reverb
194B Inductance +/- 15% - 4 H / D.C. Current - 90 ma. / Equivalent To Mfg'ers Part Number - 125C1A & 022699 Fender Bandmaster, Dual Showman, Pro Reverb, Twin Super
194F Inductance +/- 15% - 5 H / D.C. Current - 120 ma. Marshall JCM 800 & JMP (50 & 100 Watt models)
194C Inductance +/- 15% - 40 H / D.C. Current - 50 ma. Marshall "Plexi" JCM 800
194D Inductance +/- 15% - 5 H / D.C. Current - 150 ma. VOX AC30 reissue
194E Inductance +/- 15% - 30 H / D.C. Current - 100 ma. VOX AC30 vintage