RCA BA-73A Preamps? Anyone with schem or mods for these? Any techs to rack?

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123record

Member
Joined
Mar 3, 2012
Messages
7
newbie here....hope I'm not posting in the wrong spot.
I've had a pair of these BA-73A's sitting around for a bit and honestly am too unskilled to rack these myself. I did a search for anyone else on the forum who's used or racked these, and I found one previous thread, but the end result or schematic was never posted. Anyone have the schem for these, and honestly, know anyone good to rack both of these into a 2 channel pre with 48v and maybe a pad?
I'm in los angeles...
 

jensenmann

Well-known member
Joined
Oct 10, 2004
Messages
2,618
Location
Karlsruhe, Germany
ask our member pucho812 for help, he´s in LA IIRC.
I did rack a bunch of BA71 modules. Mods are not necessary, maybe recapping. I did add an input pad, a boost switch (an option from the original schematic) and the phantom power circuit. To be honest there´s no schematic for what I did, it´s been done just from memory. PSU was a JLM-Audio kit.
Here´s a pictures:

normal_000_0146.JPG

 
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