Unleash the tone of your Blues JR. Complete kit includes all the parts and detailed instruction booklet with photo's for all the following mods. This Mod kit is for the older Blues Jr's with the green circuit board. If your amp is Made in the USA then this is the mod you want. If you have a newer Blues Jr that is Made in Mexico with the Cream Circuit board then you should order the other kit I sell specifically for the newer amps.
To hear how great your Blues Jr can sound click here
NOTE: There are a few Made in USA amps with the Cream Circuit board but not many, if you are unsure about which board you have you can take a look inside before ordering. If you get your kit and find out it has the cream board I can send you the correct instructions, the parts required for the mods are the same.
This Mod Kit is easy to install and requires no drilling of the chassis or circuit board.
Tone Stack - Replace the wimpy Bass and Mid caps with 400V orange drops with corrected values to open up the tone and get rid of that boxy sound. The leads on the caps are pre-formed to insure a perfect fit. What about the Treble cap, replace the ceramic cap with a high quality Silver Mica cap. The adjusted value shifts the mids up very slightly, the result is an amp that sounds huge and warm, not boxy and thin.
Twin Mod - Fix the mids on the amp and get rid of that flabby bottom. This mod enables you to take all the mids out of the tone allowing more flexibility and versatility. This is accomplished with just a short jumper wire but the result is far better control of your tone.
Power Stiffening - Doubles the capacitance in the first filter stage, this reduces hum and increases reserve power for solid bass and strong picking, This mod gives the amp the extra torque it needs to push through strong when you are playing hard.
Cooler Bias - You are cooking the output tubes in your amp. This mod lets the amp run cooler without sacrificing tone or drilling holes in your PCB. Your tubes should live a long and happy life after this mod. I include a new bias resistor that sets the idle on the tubes to about 8.5w which is right where it should be.
Some people suggest drilling holes in the circuit board and adding a trimpot to make the bias adjustable. My kit does not include an adjustable bias. This kit is designed for finding the best mix of improvement in tone, reliability, longevity, and ease of installation for the DIY musician that is not a tech.
When considering drilling holes in an already fragile PCB to install a trimpot that requires a tech familiar with the mods to property set the bias VS. swapping out a resistor to run the amp cooler without sacrificing tone; the disadvantages of the trimpot are far greater than any benefit.
Switchcraft Input Jack - Your input jack is soldered directly to the circuit board, apply some tension when the amp is plugged in and you could cause major damage to the circuit board in the amp. This mod gets rid of the wimpy plastic input jack and replaces it with a high quality metal switchcraft jack that is panel mounted and NOT directly soldered to the circuit board. Included is a shoulder washer and isolation washer so the input jack does not ground directly to the chassis and prevents ground loops. The jack comes pre-wired with high quality, Teflon Coated, Silver Plated Solid Copper Core wire. The solder I use is Silver bearing. This is the same quality you will find in high end boutique amplifiers costing thousands of dollars.
Proper Lead Dress - Take a look inside a boutique tube amp and you will see all the wires carefully twisted and placed for greatest reduction in oscillation and noise. The Blues Jr has all the internal wires zip tied together. I give clear instructions on dressing the leads inside the amp for optimal performance, this results in lower noise and less chance for oscillation.
Reverb and Tone Mod for older Blues Jr's. The reverb on older Blues Jr's sounds horrible, this mod changes the reverb to the design of the newer Blues Jr's. If your Blues Jr was made before 2001 the reverb sounds pretty bad. This mod fixes that to produce that lush classic reverb tone that made Fender amps famous. In the oldest Blues Jr's (made before 1996) the tone is dark, the tone mod brightens up and adds more clean headroom to these first versions of the Blues Jr for a great improvement in tone.
Included in the kit is all the components necessary to to get your amp in top shape and the detailed instructions to make the changes easy. If you have a basic understanding of electronics and soldering skills you can do these mods in less than an hour.
WARNING: Performing these modifications WILL void the warranty on your amplifier. Working on amps can be deadly if you do not take proper precautions. Follow these instructions very carefully. If you are at all unsure of your ability to perform these modifications STOP and take your amp to a professional to be modified. You can also send your amp to me for modification.
No Warranty: This kit and the instructions included do not include any warranty of any kind. The modifications to your amplifier are at your own risk and you agree to completely hold harmless the seller of this kit against any and all claims. Tube amplifiers contain parts that operate at very high temperatures and deadly voltages. If you are not sure of your abilities to perform these modifications then do not perform them.
Available for international shipping, International shipments, especially to EU can take up to 4 weeks because of customs.