Hi J M,
If and when you have the time to address my question I would much appreciate it, you are the only Marshall lead 12 expert I came across that could really help me...
Thank you

Hi J M Fahey,
I came across this old thread and saw your knowledge about these amplifiers so maybe you can help me with one question:
I have a Marshall Reverb 12 that I want to modify to a head because mine comes withe  the 8" Marshall S300 Speaker wich sucks... The reverb 12 has you know shares the same basic circuit of the lead 12 with the addition of the reverb circuit but unlike the lead 12 is rated output is 12 watts into 16 ohm, I´ve  compared the schematics of the Lead 12 and the reverb 12 and, with the little knowledge that I have. the only difference I see is that r11 and r6 of the power amp section on the lead are ratted 1k and on the reverb (R35 and R36) are rated 220 on the Lead ther is also a condenser C6 ratted 22/25v that I cant find on the Reverb... Also the lead transformer voltage is 14,3 V AC  and the reverb is 21 V AC acording to both schematics.
I would like to modify the Reverb circuit to 8 Ohm speaker output, since I only have 8 ohm cabs and I will be using the amp at full blast not bedroom level I want to make sure that I will not blow anything...
Can you help me on this?
Thank you

Hi J M Fahey,
I came across this old thread and saw your knowledge about these amplifiers so maybe you can help me with one question:
I have a Marshall Reverb 12 that I want to modify to a head because mine comes withe  the 8" Marshall S300 Speaker wich sucks... The reverb 12 has you know shares the same basic circuit of the lead 12 with the addition of the reverb circuit but unlike the lead 12 is rated output is 12 watts into 16 ohm, I´ve  compared the schematics of the Lead 12 and the reverb 12 and, with the little knowledge that I have. the only difference I see is that r11 and r6 of the power amp section on the lead are ratted 1k and on the reverb (R35 and R36) are rated 220 on the Lead ther is also a condenser C6 ratted 22/25v that I cant find on the Reverb... Also the lead transformer voltage is 14,3 V AC  and the reverb is 21 V AC acording to both schematics.
I would like to modify the Reverb circuit to 8 Ohm speaker output, since I only have 8 ohm cabs and I will be using the amp at full blast not bedroom level I want to make sure that I will not blow anything...
Can you help me on this?
Thank you