Broken plastic guide on tubes - how to tell which way the tube fits in socket?

Check out the direction that the other tubes are facing.

ozzy

Something like this may help

https://www.tubedepot.com/products/octal-tube-keyway-replacement

Usually you can see where the guide was. If you can then place a mark on the tube base or grass with a marker that corresponds with the ex-guide. Accurate location of the mark is important. Then place a mark on the amp that corresponds with the tube socket slot. That should make it easier to align the tube with the amp socket.

Is the entire plastic pin gone?