DrZ KT45

[Mant]

Not to drag up an old thread but i will.....
Does the kt 45 have neg feedback?

[Gaz]

Does not look like it from this pic...

http://www.proguitar.eu/ProGuitar.eu/KT_45.html#2

[Smokebreak3]

This is pretty much it. Convert the preamp stage to standard Vox values, add a modified Bax tonestack before the PI, swap a 12AX7 for the 12AT7, ground the power tube cathodes and add a negative bias supply to put -50v on the KT66 grids and you've got a Z.

FWIW, my gut feeling is that the KT-45 is this same exact amp but set up to run on EL34s.

I can confirm this. 1k/25u EF86 cathode, 220K plate. No NFB, weird tonestack that I guess one could call severely modified James. Fixed bias and vox 12ax7 PI
I have one here customer said was unusably bright, and he was correct. Treble on 0 was how he was running it, and it went from ok on that setting to OMG bright on 2, to are you effing kidding on 10
I tried a handful of things, including larger treble cap, that cut too much gain, as did a bleeder across the MV. I settled on a good ol fashioned 1n across the EF86 plate resistor.
This one had the SS rectifier plug in, and the EL34s it came in with were taking a beating at 500V plates and 47ma bias!

[Smokebreak3]

forgot to label the Treble pot but you get the idea. Great sounding amp now with new EL34s and snubber through 2x g12h-30

IMG_1105.jpg