The PA-6 was a battery box. You'd be far better off using it than not.
The Wayback Machine works pretty well for sonicstudios.com since Leonard basically had a one page site with text and photos. I just randomly picked a date from 2005:
https://web.archive.org/web/20050604002656/http://www.sonicstudios.com/DSM In-Series External Power & Bass Cut Filter Adapters
>Most all with 3.5mm Molded Right/Angle Mini-Stereo Plug Output
CLICK Here For DSM Mic Powering Adapters Page
PA-6 (f/DSM-1S/6S) External In-Series, 2000 Hr.(1)AA Cell DSM Powering $100.-USD PA-6PFC (As Above, But) Dual AA Cell Pwr.+ Precision Film Coupling $225.-
PA-6LC3 (PA-6) + Bass 45/85/180Hz LoCut Switch+Precision Film Coupling $225.-
PA-6LC3B(As PA-6LC3, But) 85/180/250 Cycle LoCut For Mega Boom Bass $225.-
PA-6LC2 (As 6LC3, But) Bass 85 Hz LoCut with ON/OFF Filter Switch $225.-
PA-6LC (As 6LC2, But) Fixed at most used 85 Hz Rolloff...No ON/OFF Switch $125
PA-10PFC (f/DSM-1/6) Like PA-6PFC, Pro-Studio type with Dual XLR-3 Out Connectors $250.
More info:
https://web.archive.org/web/20050815080204/http://www.sonicstudios.com/pa_x.htm