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recapping an Adcom 545 Utility Plugins
Old 13th September 2011
Gear Head

recapping an Adcom 545

I've read all the GS threads I could find on recapping an Adcom GFA-545.

In this thread, Jim Williams recommends the following for a GFA-545 II:

These are the designs with a servo for the output which floats the input up to 1/2 volt. There is a large Mylar cap for blocking. I use a Wima MKC-2 polycarbonate 3.3 uf/100 v cap, fits perfectly. Bypass with an InfiniCap .01 uf. Yank out the 47 uf shunt gain cap and install a 100 uf 50v Black Gate, bypass with a 3 uf MIT and the InfiniCap. Stuff a bunch of .1 uf 600 v MIT PPMFX multicaps across the power supply caps. Stick in some Kimber AGSS silver wire from the RCA's to the pcb's.

Jim Williams
Audio Upgrades
I have a few questions:
  1. Does this recommendation apply verbatim for recapping the original "Mk-I" (i.e., not Mk-II), or do I need to make any changes to the plan?
  2. It looks like the Black Gates are virtually impossible to find. What's the best alternative?
  3. Where do y'all source high-end caps? (Want to sell any to a fellow GS-er?)
  4. Any warnings before I pry this open and start desoldering (besides the obvious high-voltage, don't be an idiot stuff)?
  5. Anyone have a service manual they could PM me?

Thanks for your time!
Old 16th September 2011
Gear Head

Any thoughts at all?
Old 17th September 2011
Black Gates aren't made anymore, so I would get either a Panasonic FM or Nichicon HE series electrolytic.

The InfiniCaps can be ordered directly or from Michael Percy Audio.
Old 19th September 2011
Gear Head

Thanks, Sean.

Is there any significant difference between the Panasonic FM or Nichicon HE?

Does anyone know whether I should alter the plan in any way for the original (non-Mk II) GFA-545?

I just want to be as prepared as possible before I start ripping this open.

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