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Wright WLA12 / WLA12A Topology

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Posted on March 21, 2017 at 20:11:03
jdrouin
Audiophile

Posts: 28
Location: Oklahoma
Joined: July 14, 2015
 Does anyone know what topology was used in the George Wright WLA12/A line preamplifier? It uses a 6X5 rectifier, 6EM7 as a series high voltage regulator, and two 6SN7s for what his old website describes as the "voltage and driver stages."

Does "voltage and driver" stage have a particular meaning? Two grounded cathode stages perhaps?

I'm trying to understand the differences between common preamp topologies (SRPP, mu follower, cathode follower, grounded grid, etc.), and the WLA12 is the only one I've ever heard. Trying to match experience with book learning here.

Thanks!

Jeff

 

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RE: Wright WLA12 / WLA12A Topology, posted on March 21, 2017 at 20:32:43
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
 My first hifi preamps but one of my long term favorites. George Wright was so cool and nice. He would respond to my most lame questions back in the day.






High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

RE: Wright WLA12 / WLA12A Topology, posted on March 22, 2017 at 08:36:14
Chip647
Audiophile

Posts: 2649
Location: The South
Joined: December 24, 2012
 Driver is typically a cathode follower.

 

RE: Wright WLA12 / WLA12A Topology, posted on March 23, 2017 at 11:00:11
jdrouin
Audiophile

Posts: 28
Location: Oklahoma
Joined: July 14, 2015
 OK, thanks. Very helpful.

 

RE: Wright WLA12 / WLA12A Topology, posted on March 23, 2017 at 11:08:14
jdrouin
Audiophile

Posts: 28
Location: Oklahoma
Joined: July 14, 2015
 I love George Wright stuff too. Many people would probably describe them as euphonic, but to me it just sounds so musical and vivid. It's hard to find used Wright components that haven't been altered, sadly.

 

RE: Wright WLA12 / WLA12A Topology, posted on March 23, 2017 at 13:52:11
jdrouin
Audiophile

Posts: 28
Location: Oklahoma
Joined: July 14, 2015
 "Driver is typically a cathode follower."

Do you think this would be an AC or DC cathode follower in the WLA12? AC would have 100% feedback in the CF stage, whereas I gather DC would have no feedback, right? Any idea what George would have used?

Most line preamp circuits I'm finding use DC CF stages.

 

WLA12 keeper, posted on March 27, 2017 at 11:14:14
Mossback
Audiophile

Posts: 1871
Location: Washington, the State
Joined: November 17, 2001
 I've owned my WLA12 for God knows how long now it will not leave my hands. George was special and is missed.

 

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