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| Marshall EL34 100/100 Stereo Power Amp Upgrades |
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EL34 100/100 Upgrades 
| Transformer |
Model # |
Price |
Install Fee |
| Output |
M-100/100-O |
$239.00 |
$50.00 |
| Power |
M-100/100-P |
$239.00 |
$75.00 |
| Capacitors |
Price |
| Filter Cap-Job |
$199.00 |
Download Upgrade-Form
Upgrade Process & FAQ's
Packing & Shipping Info
Brand New Voodoo Upgraded!
"Improve the tone, feel & reliability of your Marshall EL34 100/100 Power Amp!"
Output Transformer Upgrade™ $289.00 
(per side - see description)
Voodoo Upgrade™
Description / Specs:
- EL34 100/100 power amps are two complete power amps in one enclosure
- Channel A - Upgraded Voodoo-Designed™ VA-100/100-O output transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- Channel B - Upgraded Voodoo-Designed™ VA-100/100-O output transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- Superior tone & reliability over stock output transformers
- Greatly improved articulation & definition
- Increased / richer bass response
- Improved depth of tone
- Increased sustain
- Increased even-order harmonics (IE: sounds much more musical)
- Superior quality & performance over stock output transformer
- Increased headroom (cleans stay cleaner & louder at gigging/stage volumes)
- A must for touring musicians, engineers and producers!
- Direct drop In replacement - no drilling required
- Voodoo Upgrades™ retain your units resale value verses decreasing it
- Approximate turn-around time 5-7 days - rush service is available
- Check out out our Marshall JMP-1 Modifications!
- Transformer FAQ's
Power Transformer Upgrade™ $314.00 (per side - see description)
Voodoo Upgrades™
Description / Specs:
- EL34 100/100 power amps are two complete power amps in one enclosure
- Channel A - Upgraded Voodoo-Designed™ VA-100/100-P power transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- Channel B - Upgraded Voodoo-Designed™ VA-100/100-P power transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- 120V 60Hz Operation
- Superior tone & reliability over stock power transformers
- Improved power regulation
- Reduced noise and hum
- Improved bass response
- Improved headroom
- Improved playability - Smoother feel & easier to play
- A must for touring musicians, engineers and producers!
- Direct drop In replacement - no drilling required
- Voodoo Upgrades™ retain your units resale value verses decreasing it
- Approximate turn-around time 5-7 days - rush service is available
- Check out out our Marshall JMP-1 Modifications!
- Transformer FAQ's
- Voodoo Amps® World AC Voltage Guide
- Brand New Voodoo Modified!
Power Transformer Upgrade™ $314.00 (per side - see description) International
Voodoo Upgrades™
Description / Specs:
- No need for step-down transformers that can harm your amp!
- Includes Deluxe Upgrade™ (see above)
- EL34 100/100 power amps are two complete power amps in one enclosure
- Channel A - Upgraded Voodoo-Designed™ VA-100/100-P power transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- Channel B - Upgraded Voodoo-Designed™ VA-100/100-P power transformer by Mercury Magnetics
- $239.00 & $50.00 Installation fee (included)
- Choose your voltage - 100V, 220V, 230V, 240V & More!
- Superior tone & reliability over stock power transformers
- Improved power regulation
- Reduced noise and hum
- Improved bass response
- Improved headroom
- Improved playability - Smoother feel & easier to play
- A must for touring musicians, engineers and producers!
- Direct drop In replacement - no drilling required
- Voodoo Upgrades™ retain your units resale value verses decreasing it
- Approximate turn-around time 5-7 days - rush service is available
- Check out out our Marshall JMP-1 Modifications!
- Transformer FAQ's
- Voodoo Amps® World AC Voltage Guide
- Brand New Voodoo Modified!
Voodoo Filter Cap-Job™ $199.00
Voodoo Maintinance™
- Standard Tube Amp Maintenance
- Replace electrolytic capactors in the high voltage / B+ supply
- Restores natural bottom end
- Removes / prevents unwanted hum & noise
- Restores amps natural bottom end / bass response
- Restores tone and touch response
- Voodoo only used highest quality capacitors
- Note - To avoid tonal degradation, unwanted hum & noise or potential failure in the power supply your amp should be re-capped once every 10 years
After Voodoo Upgrades!™
Upgrade-Form / Upgrade Process & FAQ's / Packing & Shipping / Reviews / Contact / Voodoo Myspace
"Get inspired - upgrade your tone now!"
Voodoo Amps® is the Leader in Tube Amp Mods & Upgrades
Pricing, features & specifications subject to change without notice