confusing Schematic symbol, need help

[Pine]

I'm looking at a schematic for a Princeton Silverface amp, and attached to pin 4 of the rectifier tube is what looks like a capacitor with this notation: +25 --||-- -50 with the POSITIVE side going to ground. On the layout diagram it say +50 on one side and -25 on the other side of the cap, again with the positive side going to ground. I can't read what's on the actual cap, so I need to know

a) what is the value of the cap, 25 or 50 uF, what do I ask for when ordering a new one?

b)which is the correct way to wire it ?

Thanks in advance for your help

[Kap'n]

That's the bias capacitor. The + side goes to ground, because bias is a voltage below ground potential.

It's a 25uF, 50V cap.

[Pine]

Thanks Kap'n