Fender Amp Modification Kits

Fender® Vintage
Modification Kits

We have modification kits primarily for vintage blackface and silverface amps
from the 1960s and 1970s

(Picture for illustrative purposes only - actual kit components will vary from this photo)	FENDER "BLACKFACE" KIT This kit changes the circuit design of your late 60s or 70s vintage Silverface Fender® Amp to the original "Blackface" amps of the early-to-mid 60s. Most players agree that the pre-CBS blackface amps sounded much better than the silverface successors designed by the CBS engineers. With this kit, you can take your amp back to the Leo Fender design. In addition, you also restore the bias-setting capability of the amp in place of the "balance" control. These modifications are completely reversible, and no permanent changes to the chassis (such as drilling holes, etc) are required. The kit includes 9 resistors, 4 capacitors and instructions. Note: This kit does NOT apply to the silverface Bronco, Champ, Deluxe Reverb, Princeton Reverb, or VibroChamp. Part #FBK-1	$11.95
Click on photo for larger view	FENDER BRIGHT PULL SWITCH Some of the smaller vintage Fender blackface and silverface amps from the 60s and 70s omitted the bright switch ... and by doing so, they do not have the tonal options of their larger big brothers. This mod kit adds the "Bright Switch" option to original vintage amps like the Champ, Bronco, VibroChamp, Princeton Reverb and Deluxe Reverb from the 60s and 70s. This pull-switch pot replaces the volume control in these amps, and to engage the bright feature, you just pull out on the knob. No holes to drill. The pull-switch pot comes prewired with the bright capacitor. You just transfer and solder the 3 wires from the old pot to the new pot. Soldering is required - this is considered an easy modification. Instructions included. You will need two of these kits if you wish to equip both channels of a Deluxe Reverb amp. Note: Not for the reissue Princeton Reverb or Deluxe Reverb - original vintage amps only. Part #FBSK-120	$14.95
Click on photo for larger view	FENDER VIBRATO PULL SWITCH Converts the Vibrato Intensity control in many vintage amps to a pull switch intensity control to turn the vibrato on or off. Comes with a prewired C50K pull-switch pot, and our FSP-100 shorting plug for the vibrato footswitch jack to initialize the vibrato. May also be used in conjunction with the standard footswitch if you choose. Pull out the knob for vibrato, push in to kill the vibrato. You just transfer and solder the 2 wires (brown and yellow) from the old pot to the new pot/switch. Soldering is required - this is considered an easy modification. Instructions are found here. Fits vintage 1960s and 1970s blackface and silverface Bandmaster, Bandmaster Reverb, Deluxe, Deluxe Reverb, Dual Showman Reverb, Pro Amp, Pro Reverb, Super Reverb, Tremolux, Twin Reverb, Vibrolux, Vibrolux Reverb, Vibroverb. *Does NOT* fit the following amps: Bronco, Princeton, Princeton Reverb, Showman Amp, VibroChamp, and ALL blackface or silverface reissue amps. Part #FVPS-50**	$19.95
Click on photo for larger view	Fender® RCA VIBRATO SHORTING PLUG Did you know that on vintage Fender® amps (Blackface, Silverface), the reverb will work without a footswitch plugged in, but the vibrato will not? This handy-dandy little RCA shorting plug will fix that problem, if you do not own or prefer not to use a footswitch on your vintage 60s or 70s Fender® amp. Just plug this little RCA plug gadget into the vibrato footswitch jack on the back panel, and your vibrato will come alive. Turn the intensity knob to zero to cut out the vibrato when this plug is inserted. Note: Does not apply to Bronco, Vibro Champ, Princeton, or Princeton Reverb amps. Inserting this plug turns the vibrato off in those models, removing the plug turns it on. Part #FSP-100	$1.99
(Picture for illustrative purposes only - actual kit components will vary from this photo)	FENDER "S-L-O-W-E-R VIBRATO" KIT This kit changes the circuit design of the vibrato to slow down the slow end of the vibrato speed control considerably, giving a much wider usable speed range. Fast speed remains virtually unchanged, and the intensity remains the same. Jazz players especially love the slower vibrato. The official Fender vibrato "tick cure" is also included in this kit, as listed on a Fender service bulletin from several years ago. This kit is applicable to all two-channel vintage Blackface and Silverface amps from the 1960-1970 era. This kit does not apply to Bronco, Princeton or VibroChamp circuits. Kit includes necessary parts and instructions. Soldering capability is required. Part #FSVK-100	$3.50
Click on photo for larger view	FENDER® EASY GAIN BOOST MOD No drilling! This pull switch on the vibrato intensity pot gives you a substantial gain boost in the vibrato channel, while also increasing clarity and bass response. It works by completely removing the vibrato from the circuit. Replaces the vibrato intensity control with a new pot that has a built-in pull switch. Pull out the knob for stock Fender® sound (with vibrato), push in the knob for gain boost (and no vibrato). Comes with a prewired C50K pot with pull switch. You just transfer and solder the 2 wires (brown and yellow) from the old pot to the new pot/switch. Soldering is required - this is considered an easy modification. Fits vintage 1960s and 1970s blackface and silverface Bandmaster, Bandmaster Reverb, Deluxe, Deluxe Reverb, Dual Showman Reverb, Pro Amp, Pro Reverb, Super Reverb, Tremolux, Twin Reverb, Vibrolux, Vibrolux Reverb, Vibroverb. *Does NOT* fit the following amps: Bronco, Princeton, Princeton Reverb, Showman Amp, VibroChamp, and ALL blackface or silverface reissue amps. Part #FEGB-50**	$18.95
Click on photo for larger view	FENDER® TONE STACK BYPASS SWITCH - A250K A unique modification to most Fender® blackface and silverface amps. This A250K control with pull switch mounts in the bass control position of 60s and 70s blackface and silverface models that do not have a middle control (for amps like the Twin Reverb, Super Reverb and Pro Reverb that do have a middle control in one or both channels, see the FTSL-10 kit) With the switch pulled out, the tone stack is in place and the amp is stock. With the switch pushed in, the tone stack is removed completely - the bass, treble pots have no function, and the traditional "mid scoop" of the Fender® amp is gone. The amp becomes much louder with a significant gain boost, more "raw", and has a significant mid boost. The raw tone has a non-scooped mid similar to the no-tone-stack tweed amps of the 1950s such as the 5E3 Deluxe. The pull-switch pot comes pre-wired with the 6.8K mid resistor. Just remove the old bass pot and replace with the FTSL-250. This mod is considered easy. For most all blackface and silverface amps from the 60s and 70s with bass and treble controls (no mid control). Not for the reissue blackface or silverface amps. Part #FTSL-250	$19.95
Click on photo for larger view	FENDER® TONE STACK BYPASS SWITCH - A10K A unique modification to most Fender® blackface and silverface amps. This A10K control with pull switch mounts in the mid control position of 60s and 70s blackface and silverface models of the Twin Reverb, vibrato channel of the Super Reverb, or vibrato channel of the Pro Reverb that do have a middle control. With the switch pulled out, the tone stack is in place and the amp is stock. With the switch pushed in, the tone stack is removed completely - the bass, mid and treble pots have no function, and the traditional "mid scoop" of the Fender® amp is gone. The amp becomes much louder with a significant gain boost, more "raw", and has a significant mid boost. The raw tone has a non-scooped mid similar to the no-tone-stack tweed amps of the 1950s such as the 5E3 Deluxe. The pull-switch pot comes pre-wired. Just remove the old middle pot and replace with the FTSL-10. This mod is considered easy. For blackface and silverface (60s and 70s)models of the Twin Reverb, vibrato channel of the Super Reverb, or vibrato channel of the Pro Reverb with bass, middle and treble controls. Not for the reissue blackface or silverface amps. Part #FTSL-10	$19.95
	FREE! DOCUMENTATION FROM MARK MOYER FOR IMPROVEMENTS TO THE FENDER® CUSTOM VIBROLUX REVERB REISSUE. Documentation only for changing the Fender® Custom Vibrolux Reverb into a "hiss-free classic". This download is the complete documentation of the famous Mark Moyer mods for the Custom Vibrolux. The mods include the following sections, of which any or all may be completed: 1. Eliminate Reverb on Normal Channel, 2. Fuller, More Alive Reverb, 3. Shunting Cap for Parasitic Elimination, 4. Add Negative Feedback Loop (for a more traditional Fender sound, and less hiss), 5. Remove Protection Diodes (to prevent nuisance blowing of fuse and improved high-frequency response), 6. Ground Reference Resistors (for hum and hiss reduction), 7. Add Adjustable Bias Thanks to Mark Moyer and Jason McLaren for creating and annotating the documentation.	Free!
	FREE! DOCUMENTATION FROM BILL M FOR IMPROVEMENTS TO THE FENDER® BLUES JUNIOR. Documentation only for improving the Fender® Blues Junior. This download is the complete documentation of the famous Bill M. mods for the Blues Jr. The mods include the following sections, of which any or all may be completed: 1. Standby Switch Installation, 2. Tone Stack Mod, 3. Coupling Cap Installation, 4. Power Supply Stiffening, 5. Twin Stack Mod, 6. Bias Control Installation, 7. Switchcraft Replacement Input Jack, 7. Upgraded Output Transformer. Sadly, Bill Machrone (Bill M) passed away on October 30, 2016. His legacy is now being carried on by his son, Andrew, and the www.billmaudio.com website is still online.	Free!

Strat®, Stratocaster®, Esquire®, Telecaster®, Tele®, Jazzmaster®, Jaguar®, Mustang®, P.Bass®, J.Bass® and Fender® are registered trademarks of Fender® Musical Instruments. The replacement necks and bodies are for a Fender® or Squier® by Fender® guitar or bass. The distinctive headstock designs and the distinctive body designs of the Stratocaster®, Telecaster®, J.Bass®, P.Bass® and Tele® Bass are registered trademarks of Fender® Musical Instruments Co.
Peavey® is a registered trademark of Peavey® Electronics Corporation.
Marshall® is a registered trademark of Marshall® Amplification Plc.
Mesa Boogie® is a registered trademark of MESA/Boogie® Ltd.
AmpRepairParts.com and Studio Sound Electronics are not affiliated with these companies.
All company names, logos and product names mentioned on these pages are trademarks of their respective owners.