Output Transformer kt88 6550 pp, Wires? Jukebox? Help.

[Raymond Czujko]

Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
4 wires, in two groups which do not seem to connect;
2 wires brown vs grey 3ohm,
2 wires ivory vs green 40ohm.
3 wires, brown vs white CT 25ohm vs orange.

I believe these are jukebox, have three.
Says CML 85099, 6550 pp.
Says CML 85099, 6550 pp.
Says CML 85099, kt88 pp.

How to connect it? I want to use these as pp output transformers.


Normally I can figure out the common vs 4, 8, 16ohm by resistance,
but these four wires do not seem to connect in the windings.

Thanks in advance. RC

[bob91343]

I would estimate the plates go to ivory and green. Brown and grey are low impedance speaker output. Brown white orange may be 600 Ohm output for a long run to a distribution system, or maybe 70 V or 25 V system.

Connect an audio oscillator and voltmeter and measure the turns ratio.

[Raymond Czujko]

Hello, I reworded the details to make it a bit clearer.

Output Transformer kt88 6550 pp, Wires? Jukebox? Help.

One side has 4 wires,
in two groups which do not seem to connect;
2 wires brown vs grey 3ohm, ((My guess is this is the regular speaker output pair.))

2 wires ivory vs green 40ohm. ((?? distribution ??))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Other side has 3 wires, Question: Wouldn't the 3 wires be the tube side?
brown 25ohm vs white CT vs 25ohm to orange.

((My guess. plate, ct, plate))
My Marshall on this side has 3 wires like this;
brown 22ohm vs white CT vs 22ohm to RED.

Any info would be appreciated. Thanks, RC

[bob91343]

Yes that's what I would guess.

[Raymond Czujko]

Thanks Bob!