Opened the jvm210h today to put an MM 3h choke. Noticed that the main board looks the same as the 410. R58 was there and was 82k. I put a 150k. Put a .68 micro f cap with R97. Wooooooooooow! The distortion is transformed. More clarity, definition, articulation. There is more sparkle on the clean green. Way better. Thanks.