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Be careful with those 5751. ML2 became unstable with 6db more or less (I do not remember already) global feedback. Lamm told me a long and big story how critical for ML2 to have the global feedback of exact amount and how “properly” the feedback is implemented in this amp. At that time I was ignorant and was listening what Vladimir told me gullibly? Stressing the exactness amount of global feedback in his design Lamm however endorsed to use the 5751 in input stage.  Later on what I get some understanding of the process I was laughing on Lamm’s self-pomposity.

The ML2 has global feedback that covers all 3 states and 12AX7 in the first stage. If you put the 5751 in the first stage then the gain of the first stage gets reduced by ~25% that would make the gain of open loop reduced. The closed loop is still that same that would make the amps in a whole to change the amount of the global feedback that is being used. I did not detect any problem to use the 5751 but I found that it was very funny that Vladimir insisted that the feedback resistor mast not be changed because it will be “bad for feedback sound” but the change of the gain in the open loop is permitted - like it would not affect the close loop.

I am sure that for 3 easy payments of $699 Lamm would promise to reset the laws of physics in his amp….

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