Tube DIY Asylum

Wright sound AGphono

69.168.218.105

HiFiOd

I am searching information on a circuit and thought you may know something. I saw an old post of yours regarding George Wrights phono preamp. I have an AG phone, and it needs repairing. I was wondering if you knew the whereabouts of any schematics for that phono preamp, or whether the other phono preamp is similar.

Follow Ups:

You might see if you can find a copy of his book 'The Tube Preamp CookBook' nt - Ralph 10:47:03 08/23/24 (2)
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- RE: You might see if you can find a copy of his book 'The Tube Preamp CookBook' nt - Cleantimestream 12:58:58 08/23/24 (1)
  Ralph, might you be referring to the Allen Wright? My Audio Research Reference 1 looks like it has 'borrowed' some implementation of Allen Wrights regulation... Has.been said imitatio
  IS the sincerest form of flattery.
  The Mind has No Firewall~ U.S. Army War College.
  - RE: You are correct! nt - Ralph 14:36:29 08/23/24 (0)
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RE: Wright sound AGphono - Paul Joppa 21:33:59 08/22/24 (2)
Not sure who you are addressing(?)

But for what it's worth, George hardly ever drew circuit diagrams, and often modified circuits as he built them. So even if you find a diagram, you can't count on it to be accurate.
- RE: Wright sound AGphono - HiFiOd 15:25:26 08/23/24 (1)
  Is there are good guide on reverese engineering a circuit into a schematic?
  - RE: Wright sound AGphono - Paul Joppa 19:08:38 08/23/24 (0)
    I've never seen one. If it were me, I'd start with a guess about which tubes have which functions, then look for the expected components - e.g. plate resistors connected to the plate pins, cathode bias resistors and bypass caps at the cathode, etc. I know for example that George usually used the 6ER5 or other high-gain frame grid tubes at the input of phono preamps, and sometimes used dual dissimilar triodes for voltage regulators. He often used cathode followers at the output, direct coupled to the final gain stage.
    
    Hope that helps a bit!

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