29-07-2020, 10:51 AM
A triodised (but g3 to 0V) 1j24b working well as the oscillator section of a DK96 circuit, though aim is to replace an 1L6.
LW has 40 V pkk RF
MW has 30 V pkk RF
The original DK96 does also give more on LW than MW.
The DC is about 40V.
So that's nearly perfect to drive g2 on a Pentode RF amp as a mixer, either the 1j24b or anything else.
Also means same circuit will replace a Triode-Pentode or Triode Hexode.
Also triodising means no pesky g2 HT, which isn't very compatible between Rod Tubes and conventional Pentodes or Tetrodes unless their g2 is tied to a battery tap; if it's just a series resistor you need to know the value and add a second resistor to ground to give about 2/3rds to 3/4 HT.
Next looking at the Pentode RF amp as a mixer by driving g2 direct from anode of oscillator.
LW has 40 V pkk RF
MW has 30 V pkk RF
The original DK96 does also give more on LW than MW.
The DC is about 40V.
So that's nearly perfect to drive g2 on a Pentode RF amp as a mixer, either the 1j24b or anything else.
Also means same circuit will replace a Triode-Pentode or Triode Hexode.
Also triodising means no pesky g2 HT, which isn't very compatible between Rod Tubes and conventional Pentodes or Tetrodes unless their g2 is tied to a battery tap; if it's just a series resistor you need to know the value and add a second resistor to ground to give about 2/3rds to 3/4 HT.
Next looking at the Pentode RF amp as a mixer by driving g2 direct from anode of oscillator.
