john q. bebop said:I recently received a Fisher FM-90X, dirty but it works great, nos tubes and all. One of the tubes listed on the chassis and in the schematic is designated as a "V50,064". I can't find any data on this, any ideas what it is?
john q. bebop said:After checking out the schematic for the FM-100 from gingertube's response I came up with this, an Amperex (or Valvo) 6922 PQ, late 50's.
It has the gold pins & pinched waist described in this link: http://spazioinwind.libero.it/themagicsound/_private/6922pinch_waist_eng.htm
The only markings on the tube that I can read is the "52F", which you can see in the picture. There is a fainter marking that I think is "46L" but I'm not sure. Maybe a date code?
What do you think?