I need a schematic of how to convert a Harmon Kardon Citation II amp from triode top pentode mode.
Right now I have a 270 ohm resistor going from pin 4 of a Kt88 tube to 2nd & 4th connections on output transformer.
What do i need to change?
Right now I have a 270 ohm resistor going from pin 4 of a Kt88 tube to 2nd & 4th connections on output transformer.
What do i need to change?
So you are asking for a plain vanilla Cit II schematic?
Google is your friend. Jim McShane’s website is a good resource. See http://www.mcshanedesign.net/CitIIsch.jpg
Google is your friend. Jim McShane’s website is a good resource. See http://www.mcshanedesign.net/CitIIsch.jpg
@Lmitchell
Your amp works in ultralinear and has local negative plus global negative feedback.
What do you want to get from triode configuration?
Your amp works in ultralinear and has local negative plus global negative feedback.
What do you want to get from triode configuration?
270 Ohm from screen pin 4, to Ultra Linear Tap = Ultra Linear mode
270 Ohm from screen pin 4, to plate pin 3 = Triode Wired Beam Power mode
270 Ohm from screen pin 4, to output transformer center tap (B+) = Beam Power Mode (A KT88 is a Kinkless Tetrode, which is a Beam Power tube, with beam formers).
A true Pentode, has a Suppressor grid, g3. A true pentode does Not have beam formers.
Pentode refers to 5 elements, but real pentodes had suppressor grids.
The pentode patent, forced RCA to come up with Beam Formers, to circumvent the Pentode patent.
Elements Pentode: Elements Beam Power
filament and cathode filament and cathode
control grid, g1 control grid g1
screen grid, g2 screen grid, g2
suppressor grid, g3 beam formers
plate plate
EL34 KT77
EL34 specifications = KT77 specifications. These are real good candidates for Tube Rolling
270 Ohm from screen pin 4, to plate pin 3 = Triode Wired Beam Power mode
270 Ohm from screen pin 4, to output transformer center tap (B+) = Beam Power Mode (A KT88 is a Kinkless Tetrode, which is a Beam Power tube, with beam formers).
A true Pentode, has a Suppressor grid, g3. A true pentode does Not have beam formers.
Pentode refers to 5 elements, but real pentodes had suppressor grids.
The pentode patent, forced RCA to come up with Beam Formers, to circumvent the Pentode patent.
Elements Pentode: Elements Beam Power
filament and cathode filament and cathode
control grid, g1 control grid g1
screen grid, g2 screen grid, g2
suppressor grid, g3 beam formers
plate plate
EL34 KT77
EL34 specifications = KT77 specifications. These are real good candidates for Tube Rolling
