Stancor A-3898 mod transformer

[Detroit47]

Hi guys
I ran across a Stancor A-3898 Mod transformer in my junk. It is the Poly-Pediance type 300 watt 260 mil primary and secondary. About 37 pounds does anyone have experience with this transformer.
73 Johnathan N8QPC

[Steve - WB3HUZ]

Connection info.

[John K5PRO]

While it has a gap in the core to handle DC current component on the secondary, it is best to use a coupling capacitor to block the DC on the RF side, and use a secondary modulation reactor (what some call modified Heising). This will yield better low freq. response with the Polypedance.