Announcement

Collapse
No announcement yet.

Narrow Panel Deluxe question

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Narrow Panel Deluxe question

    ...what most refer to as the 5E3.

    Just from looking at the schematic, and it's similarities with the Champ (aside from the twin 6V6's), I had assumed that this was a Class A P/P output section.

    I've read statements of AB and A from some pretty smart folks...and just would like to see what the concensus is.

    This applies to the original design. IOW, what was this 5E3 originally 'intented' to be?

  • #2
    Originally posted by Earl View Post
    ...what most refer to as the 5E3.

    Just from looking at the schematic, and it's similarities with the Champ (aside from the twin 6V6's), I had assumed that this was a Class A P/P output section.

    I've read statements of AB and A from some pretty smart folks...and just would like to see what the concensus is.

    This applies to the original design. IOW, what was this 5E3 originally 'intented' to be?
    I would say, to be fair, only Leo Fender would know the answer to that.
    I think they are PP, Class Ab1 with just high idle current.
    Last edited by Bruce / Mission Amps; 04-07-2008, 01:07 PM.
    Bruce

    Mission Amps
    Denver, CO. 80022
    www.missionamps.com
    303-955-2412

    Comment


    • #3
      Originally posted by Earl View Post
      Just from looking at the schematic, and it's similarities with the Champ
      (aside from the twin 6V6's), I had assumed that this was a Class A P/P output section.
      A clearcut answer to this question is hard to find. The big difference between
      a 5E3 and a Champ is the phase inverter and its driver. Since I don't have a
      5E3 (yet) to look at with a scope all I can say is that it's probably class AB if
      the PI can drive it into AB (and if the cathode bias will let it) and class A if it
      can't.

      Surely Bruce knows the definitive answer to this

      Paul P
      Last edited by Paul P; 04-07-2008, 04:55 PM.

      Comment


      • #4
        More than likely, you just can't tell...unless you measure it. And *if* you use the strict definition of "A", with a 360 degree full power plate conduction angle - it's possible that even a tube change could knock it into, or out of the class definition.

        Tubes are generally spec'd in their center of operation, and the saturation and cut-off points probably vary quite a bit, between tubes.

        What I've found is that a LOT of Leo's amps (the old ones) came pretty much right out of the old Receiving Tube Manuals...and I'll bet there's a very similar schemo for a "5E3" in one of them ol' books.

        Comment

        Working...
        X