VU Meter Lamps

I own an old (30years) Phase Linear 400. I'm looking for the fuse type lamps for the VU meters. Any ideas were to look?
If you're referring to the original 400 S1 lamps - there use to be a guy on ebay selling them. I also picked up some from one of the electronic supply houses (I think it was Mouser). I don't recall off hand - but think they are 6V. The problem with the ones I bought is they were smaller, not as bright, which may be preferable, but it's a choice.

Here's also the link to the Phasetek site FAQ on lamps: