Pro Junior Tube Board

Introducing the Fromel Tube Board for the Pro Junior:  Unlock the Full Potential of Your Amp!

The Fromel Tube PCB is the solution to maximize your amp's performance, regardless of its version, from Made in USA to the cathode biased IV.

Experience a huge improvement in tone, feel, and noise reduction with the new Tube PCB Mod. We've fine-tuned every detail to deliver unparalleled sonic excellence.

Mods from Stock:

Cathode biased for a touch responsive playing experience. Prior to the current version of the IV all Pro Jr’s were fixed bias and run hot if not modified. Changing from fixed to cathode bias solves all the bias issues for the amp and it sounds fantastic. 

DC elevated heaters eliminate heater hum. When we installed the first prototype, we were astonished by how quiet the amp was; I honestly don’t know why every amp maker does not do this to the heaters, it’s very simple and works incredibly well.

The stock board is single sided and the PCB mounted tube sockets are only secured by a thin pad and a bit of brittle lead free solder. After a couple of tube changes the stress can crack these joints and this is one of the well known failure points on these amps. 

The Supreme Tube board is double sided with plated through holes resulting in a solder joint is very secure. All the thick traces on the PCB are the equivalent of 16 gauge wire. Pre-installed SMD components make installation a bit quicker. The instructions are right on the PCB and there are detailed instructions with photos online. 

The ribbon cables are replaced with individual pre-stripped leads. The kit also includes high quality ceramic sockets vs the stock plastic ones. 

The Pro Junior Tube Board It’s a great improvement to any model Pro Jr with or without the Supreme mods for the main board.