Hi! I have to change 2 diodes into my Marshall 50W JMP 1976 MKII 1987 model. 3 are 1N4007 and 2 seem to be original (10D8). 2 in series read 0.548V, 0.565V, the reverse one in line with the bias feed resistor is 0.568V but the 2 others in series read nothing (0V), so the main fuse is blowing. 1-What are your opinion on UF4007 VS 1N4007 for my JMP? 2-True to say that the UF will reduce the background buzz and sweeter the highs of the amp? 3-As the PCB will be lift, better to replace all of the 5 diodes? Thanks!