




J20 and J20H Upgrades
I love the feel and tone of the J20, but the build quality, noise floor, and reliability can be vastly improved.




If your J20 Mains Transformer has failed, I can help.
I take the excellent-sounding J20 and make it much, much better. Now you can confidently use the amplifier night after night without worry.
The Mods
1 - The stock ‘forbon’ circuit board, known for becoming conductive over time, is removed, and a new Keystone eyelet board made from FR4 is installed. F&T and Sprague electrolytics, MF and MO resistors, and quality tone capacitors are used to improve the noise floor of the amplifier.


2 - A HT fuse is fitted, along with a safety resistor so that the amplifier can not hold a lethal charge when switched off


3 - The grounding scheme is vastly improved, no more hum and buzz


4 - The stock CTS potentiometers are replaced with Bourns units, including the switched TONE pot.

5 - A lead dress improvement is carried out to reduce unwanted noise
6 - The Mains Transformer is replaced with a custom-wound, UK-made unit, allowing the removal of the noisy cooling fan whilst retaining the sag and bloom characteristics that you love


7 - The Mains wiring is brought up to all current safety regulations, ensuring complete compliance with the law



8 - Screen Grid Stoppers are added to help prolong the life of the output valves, along with setting the bias for optimal tone and feel
Got a J20H? I can carry out the same upgrades as above, but the main transformer doesn’t need replacing, although our unit performs better!
J20 - £550 inc VAT
J20H - £450 inc VAT
12-month parts and labour guarantee on all Rift work on these amps. Prices above do NOT include valves if required.
Please call 01280 472707 or e-mail repairs@riftamps.com to arrange improving your amp to the standard it deserves!