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24.15.32.233
In Reply to: RE: Fender PS400 amp posted by FenderLover on April 19, 2012 at 19:29:53
The Tung-Sols were supplanted by GE 6550As in fairly short order. Check the link below for some interesting stuff!
Edited to fix typo...
Edits: 04/22/12Follow Ups:
Yeah, great site. I have it in my bookmarks.
Curious though about monitoring the AC lone current to set bias. Apparently they claim it's the official set up procedure.
Anyone know more about it?
There really is no "they" - it's Rich Koerner, the owner/operator of Time Electronics.
If you look at his updates and modifications page you can see the procedure. It's credited to Ed Jahns (Fender) and dated in the 1970 range.
I know Rich personally - and while he is definitely a "curmudgeon", he also knows his stuff BIG time. I have no doubt about the authenticity of what he has up on the site.
One of the pics on the site shows Rich a NUMBER of years ago with his black cowboy hat on while working on a 400-PS. He's been around these things from the get-go.
That is an interesting point. I haven't seen one of these measuring instruments in any amp tech's collection. Maybe, it's from AM and SSB transmitter tech stash of goodies.
I would love to take a look at the guts of that beast! Man, those absolutely MELTED 6550's! Amazing.
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