[RodB]

You can check here for a schematic:

https://philcoradio.com/library/index.ph...ams-vol-1/

Then, when you read it and the parts list you will see the capacitors listed. Some are stuffed in black bakelite blocks with terminals attached. There can be one or two capacitors or a cap and a resistor inside a block. Most capacitors in blocks are paper and should be replaced. Look elsewhere on the Phorum for methods to remove them from the blocks. My preferred method is to disconnect the capacitors, heat the block with a blower and push the guts out with a small drill bit. There is a service bulletin here that shows bakelite block wiring diagrams:

https://philcoradio.com/library/index.ph...lock-data/

There's also a block, #23, that has 5 capacitors inside and should be tagged so you can reconnect the new ones. Replace all paper and electrolytic capacitors, the mica capacitors (values in mmf) can be left alone. Note that one of the power supply filter capacitors' negative is not grounded. I get my capacitors from Mouser with $6 usps shipping.

Also measure resistors and replace any outside of 20 percent tolerance (I use 10 percent).