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RE: Audio Research SP9 MK2

Definitely begin w/o the by-passess. ARC used them to improve the then SOTA Wonders and RELs that are dull sounding.
Whether you by-pass your upgrades is a matter of taste.

I'm a big fan of Obbligato caps and used a copper case .47 film and oil and film 5.0. No by-passes.

There is a parallel coil and resistor in series with the 100uF electrolytic; be very careful with it, the wire and plastic bobbin are quite fragile. Don't ask me how I know. Nothing that superglue couldn't fix, tho'.

Jim Hagerman always uses 1N5821 Schottkys on his filaments, the recovery and rise specs are very good and there is little voltage drop.They're in my Aikido. I recently tried Fairchild Stealth 4A, 600 volt from Michael Percy to replace them and lost more than 1/2 volt, 5.65 volts with a jumper. Silicone Carbide 600 or 1000 volt Cree or Infineon work well on HT and made an EL-34 amp noticeably quiter.

I've read that by-passing the delay circuit makes an audible improvement but haven't yet tried it. have fun.

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