Waldo Modified Mosvalve 962.
$450.00. Yup. You could buy one for $200 on Ebay/Reverb. This has been service about 2 years ago by Pat Hickman. And then it was modified specifically to pair with an SMS Preamp or SMS Preamp with Maestro Mod.
PM if interested.
Peace
"Hi Ho...the Carrion Crow...FoldeRoldeRiddle"