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    Bring-up issue after updating PL400 Series II

    I recently did a very successful White Oak upgrade on a nice PL400 Series II, no problems. That is a very awesome amp now. This left me with a good condition PL-36 board. So, I used this board to fix up a different PL400 Series II that was in pretty sorry shape. I replaced all caps on the...
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    Almost legit source of UAA170 for Series II LED bargraph displays

    I ordered 5 pcs UAA170 from this dubious looking listing on Aliexpress: https://www.aliexpress.com/item/-/32805454426.html To my amazement, they arrived today. They were all scratched up and clearly RECOVERED FROM OLD BOARDS via solder pot! So these are the real thing. I put a socket on one...
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    PL400 Diodes on C6 to prevent latch up: how about on Series II (PL-36)?

    I have been reading about the PL400 latch up, and people say that putting back-to-back diodes across C6 can prevent it. And changing C6 to 470uF helps low end response. I have 3 PL400 Series II's with PL-36 kicking around. I am thinking that they all have the same latch up potential. Would...
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