Adjustable Bias Modification Kit
With our Adjustable Bias Modification Kit you can modify your fixed, non-adjustable biased amp so that you can set the bias for optimal performance, and use other types of power tubes instead of the manufacturer’s “required” type. Great for amps such as older Marshall, Peavey 5150, many Mesa Boogies, and other type of amps.
Our kit includes a small PCB with your choice of 10K, 25K, or 50K trim pot, your choice of range resistor, 1 ohm, .5 watt, 1% bias measurement resistors (2, 4, 6, 8, or none, see dropdowns below to select), mounting hardware, a section of stranded wire, and a guide for installation and bias procedure.
If you need help determining the values to select for your particular amp, please contact us!
Note: Components shown in photo are for reference only. Depending on your selections, components may vary in appearance.
Pricing and Options
9 in stock (can be backordered)