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The later Simul-class with 6L6 like in the IVB on started using 150k bias grid resistors, where the early 6CA7/EL-34 amps had 220k on both Class A bias grids, 150k runs cooler for 6L6's I have done that on IIC+ so the owner could run all 6L6's without the risk of burning them out so fast. I have...

https://cdn.imagearchive.com/boogieforum/data/attach/3/3090-50-50-Power-Amp.pdf

I used to have those pics, Ill try to fund them. Have you seen this thread? https://boogieforum.com/threads/50-50-deep-mod.55963/ I can send you a schematic of the updated 50/50 with mods in place if you want.

OOPS!! I did not mean to double post this, can it be deleted?

I have a factory modified 50/50 with the FAT mod (Done at the Mesa Factory before I bought it), I love it, and used it with my Studio preamp, I sold the preamp but the 5050 sounds great with anything I use it with :) I have had both versions, the FAT mod is fatter sounding but still clear. They...

I have a factory modified 50/50 with the FAT mod, I love it, and used it with my Studio preamp, I sold the preamp but the 5050 sounds great with anything I use it with :)

Yep, those were the differences, I prefer the IVA/IIC+ values😊🎸☕

Does anyone have a Badlander schematic? I'm checking out a friend's that we want to make sure the voltages are right and have a better understanding of how it works😊

Sorry, I needed to proof read I'm not seeing clearly, the IVA WAS more like the IIC+, the IVB lead channel was different maybe more compressed sounding, when I changed all the parts, resistors caps etc. It sounded closer to a IIC+, sorry about that 😏

Oh and yes the IVB lead channel was pretty much the same as the IIC+, but I was told by a friend that worked there, the had crosstalk issues between the reverb and one of the lead channel 12ax7s, as they shared the same 12ax7, one half to the reverb, the other half or 12ax7 stage to the drive...

I meant my Mark III and IVB Had the 1k, and 5.6k, his IIC+ had the 1k in both positions. I think I'll put the 500pf in parallel with the 270k, .001uf seems a bit much to my ears. Also the IIC+ had the 680k to ground at the grid after the 3.3meg (10 or 20pf cap) mixing resistor? On my III it had...

Yes, I did the 120pf. The IVB was a little different in the lead channel, I have a friend with a mint IIC+ and the power supply has the 1k and 5.6k dropping resistors, my friends IIC+ has a 1k in both positions, putting more voltage on the 12ax7 plates, it sings more than the 5.6k which was more...

I wired the outer output tubes triode, but might wire them back pentode, that's one thing I miss about the IVB, it has switchable triode/pentode.

Sweet!! I have a Green stripe head that I retrofitted to IIC+ other than the power transformer, its more like the IIC++ :) Your combo is immaculate!! :)

I modified my IVB Lead channel with the IIC+ values,made a world of difference, I also swapped out the output tranny that I purchased that came out of a earlier Simul-Class stereo power amp that used the IIC+ style output transformers. Also in the power supply string there are 2 1k 2watt...

I hope this is the place to PM you! :) HI Jay, how much are you selling the IIC+ boards for and do you have any pics? Thank you! Ed

Hi there, yes, I am interested in PC boards for the IIC+ upgrade, I have the chassis and transformers (Mark III Green stripe), but maybe interested in the 105 transformer if they come available. Thank you! Ed :)

Any updates? Thanks Ed :)