![]() I found this thread, just after I ordered a new Blues Junior IV Western. Reverb tank type, please post the differences. If anyone has a different model BJ IV (US, EU) that has different components or other circuit changes e.g. The power transformer part number for 240v export model is different. Resonance circuit added in NFB path - C9 0.047 uF, R60 100K ohms Reverb tank is a Ruby Tubes RRVS-3EB2C1B which has same specifications as a 8EB2C1B being 800 ohm input, 2575 ohm output Reverb section input now taken from plate of V1-A before tone controls Cathode bias added - C10 - 22 uF, C33 - 22 uF, R51 - 270 ohms, R52 - 270 ohms, R31 & R32 connected to ground Fixed bias power supply components R51, R52 & C33 removed from power section The schematic was done from a 240V export (AU) black tolex Fender Blues Junior IV, manufactured 2021. They are both based off the Fender Blues Junior III drawings as Fender has kept the majority of the same component numbering for the BJ IV. I have managed to do a schematic and PCB layout for a Fender Blues Junior IV.
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