Ampex 350 recapping question Polarized for the old paper?

[jwhmca]

Hi guys,

I'm doing a full recap on a AMPEX 350 and wondering if I need to use polarized caps marked in red. There are others that are they same Paper type... regular bi-polar polys okay?

**The old caps have a black band around one end**

 

[jwhmca]

Wow! I found google... Answer = yes

 

[Bill Wilson]

The caps Circled on the schematic are non polarized capacitors. If it required polarized electrolytics they would be marked with + & - signs. I owned a new Ampex 351-2 in 1964; so I am fmiliar with the circuit.