Transformers
Author: Kevin M Date Posted:15 April 2026
Evatco Transformer & Choke Range
Your Complete Selection Guide for Guitar Amplifier Drop-In Replacements, Hi-Fi Output Transformers, Power Transformers, Filter Chokes, and Driver Units.
Guitar Amp Direct Replacements
Guitar Amp Power Transformers
Try our Transformer Selector hereFender Power
Drop-in replacement power transformers for iconic Fender circuits (Tweed, Blackface, Silverface).
- Champ, Deluxe Reverb, Princeton
- Bassman, Twin Reverb, Super Reverb
- Correct B+ voltage taps & filament lines
Marshall Power
Heavy-duty power transformers designed for vintage and modern British high-wattage amplifiers.
- JTM45, JCM800, JCM900, Plexi
- 18W, 50W, and 100W power builds
- Authentic lay-down & upright mountings
Vox Power
Precision-wound power supplies engineered specifically for the demanding needs of Vox amplifiers.
- AC15 and AC30 replacements
- Thermally resilient wire insulation
- Designed for high cathode-bias currents
Guitar Amp Output Transformers
Tone-Critical Impedance MatchingFender Output
Delivers classic American clean headroom, glassy top end, and smooth low-end response.
- Single-Ended & Push-Pull options
- Multi-tap outputs (4Ω / 8Ω / 16Ω)
Gibson Amps
Exact drop-in output transformers for classic Gibson, Kalamazoo, and Epiphone tube circuits.
- GA-5, GA-15, GA-20, GA-40 models
- Restores authentic mid-century warmth
Marshall Output
Engineered to handle aggressive power tube distortion, tight punch, and singing mid harmonic bite.
- Plexi, JTM45, JCM 50W/100W specs
- High saturation thresholds
Orange Amps
Rugged output units built for deep bass extension and massive gain headroom in British stacks.
- OR120, Rockerverb, & Tiny Terror specs
- High-grade lamination steel
Vox Output
Faithfully reproduces the top-boost chime, subtle compression, and dynamic response of Vox amps.
- AC15 & AC30 exact replacement specs
- Ideal for 4x EL84 push-pull topologies
Guitar Amp Chokes
Filtering & Power Supply DynamicsFender Chokes
Smoothing chokes for Deluxe, Super, and Twin Reverb circuits.
Marshall Chokes
3H to 10H inductors for 50W and 100W Plexi / JCM heads.
Vox Chokes
High-reliability filter chokes for AC30 power supplies.
Yorkville Chokes
Replacement inductors for Traynor & Yorkville tube amps.
General Power Transformers
300 Series High Voltage Plate & Filament
Flexible power transformers designed for custom tube amp builders, Hi-Fi preamps, and power amplifiers. Supports universal primary mains voltages (100V, 120V, 220V, 240V @ 50/60Hz).
- Multiple High-Voltage B+ secondary taps
- Dedicated 6.3V and 5V rectifier filament windings
- Epoxy potted or classic open frame mounting choices
Mains & Filament Transformers
Ideal for scratch-built tube audio amplifiers, isolation setups, and bench testing equipment where precise secondary voltage matching is necessary.
- 50/60Hz operation for Australian 240V mains compatibility
- Low hum, magnetic flux shielding options
General & Hi-Fi Output Transformers
| Series / Category | Configuration | Power Range | Key Features & Typical Applications |
|---|---|---|---|
| 10W to 280W Push-Pull | Push-Pull (Class AB / B) | 10W – 280W | High-power output transformers for heavy guitar amps and high-wattage stereo amplifiers. |
| 125A–125E Series | Universal Push-Pull | 3W – 80W | Multi-tap primary/secondary windings for easy impedance matching in general replacements. |
| 125SE Series | Single-Ended (Class A) | 3W – 25W | Gapped core design to prevent DC bias saturation. Great for Champ-style and small Hi-Fi amps. |
| 1627–1642 Series | Single-Ended Hi-Fi | 15W – 75W | Audiophile frequency response (20Hz–20kHz), ultra-linear taps for pristine music playback. |
| 125J Series (General) | Push-Pull Tube Output | 8 Watts | Economical, high-performance replacement for 8-watt push-pull amplifiers (2x 6V6 or 2x EL84). |
| 125H Series (General) | Push-Pull Tube Output | 8 Watts | Compact footprint replacement for small practice amps and low-watt studio setups. |
Filter Chokes & D.C. Reactors
D.C. Filter Chokes 193 Series
Enclosed, potted filter chokes designed for severe service in power supply filter networks to suppress AC ripple voltage.
- Inductance levels up to 30 Henrys
- High DC current carrying capacity
Filter Chokes 153–159 Series
Economical open-bracket filter reactors designed for power supply noise reduction in audio amplifiers and industrial gear.
- Flexible inductance & resistance choices
- Compact mounting footprints
194 Series Guitar Amp Chokes
Specifically tuned inductors for replacement in Fender, Marshall, Vox, and custom guitar amplifier power supply filtering.
- Restores dynamic "sag" & power response
- Exact original mounting hole spacing
Audio & Driver-Interstage Transformers
Audio Transformers
Line-level matching, studio isolation, microphone, and line driver transformers designed for minimal phase distortion and flat frequency bandwidth.
- Impedance matching (600Ω, 10kΩ, 50kΩ)
- Shielded Mu-metal cans available for ultra-low noise
Tube Driver / Interstage Transformers
Coupling transformers used between preamp stages or driver tubes to drive power tube grids directly without coupling capacitors.
- 1:1, 1:2, and phase-splitting primary/secondary ratios
- Excellent dynamic headroom for high-power Class A2 / AB2 amps
Selection & Installation Note
Always verify your amplifier's primary mains voltage requirements (e.g., 240V for Australia), HT secondary voltages, output impedance taps (4Ω, 8Ω, 16Ω), and mechanical mounting dimensions (lay-down, upright, or channel frame) prior to ordering. When replacing power transformers, always verify filament power rating matches your total valve count.
