Modding t222 using keyboardpartner.de article and....descrepancies

[vhm14u2c]

Hi all, my first post here, had my hammond t222 a long time, since 2002, and have not got around to doing these mods...till now.
i came across some issues/discrepancies that others may be familiar with(better not to follow pictures when doing mods)If they are posted already, please provide link to thread.

two things I'm interested in for now are percussion mod, and add distortion/ most likely will do key click too sometime later
started out with skill3, percussion mod-

My resistor packs are in reverse order than what keyboardpartner.de has, and makes me believe I took out preset drawbars instead of steps needed to do percussion mod.
I have included photos and descriptions on them.

anyone else come across this same issue?

thanks!

ps-

one other thing I do want to mention, I do realize t500 and t200 models are not the same, and think modding might be a little different for me.

i took out the two existing resistor packs carefully, so they can still be used as well.

[Papus]

Looks to me like you're just looking at the board from the opposite perspective.
Also, the photo on the keyboard partner website depicts the additional mod of replacing the last two preset resistor blocks with custom arrays of individual resistors.
I have a 202, ostensibly identical to your 222 - the difference in model numbers simply represents the different cabinetry designs - my 202 boards are exactly the same as the boards depicted on the keyboard partner website

[vhm14u2c]

Hi, didn't know how to reply first time around,I added better pictures, and can see my reply to you in that post.

[vhm14u2c]

Hi , same perspective with website and my photos, all resistor packs are in reverse order on mine though.
.

The resistor packs you removed for the percussion mod, are they identical pins/resistor packs, as shown on the ones I removed?

I included better pics.

one other unrelated thing. I see that the prior post was not my first, has just been awhile. My procrastinating is elite, lol

[Papus]

Strange - perhaps an error in manufacturing?
Do (or did, since you've now removed two of the resistor packs) your percussion and drawbar presets sound like they correctly represent the descriptions on the tab switches?
For me, it's irrelevant - I never use the drawbar preset tabs, and the only remaining stock percussion preset I use very rarely is Banjo - to demonstrate the Six Million Dollar Man sound effect to my friends, they love it!

There are other mods above and beyond the keyboard partner ones which you might want to consider:

Upper Manual - make the 16' drawbar the same volume as the others - its resistor is double the value of the other drawbars, thus halving the volume.
Lower Manual - make it the same volume as the Upper Manual - there's a resistor in the Recovery Amp which reduces the Lower Manual volume compared to the Upper Manual.
Lower Manual Bass Foldback - drop the Lower Manual by one octave.
Effects Loop on Pin 3 of the Recovery Amp - this is quite useful for inserting an in-line outboard EQ, noise gate or any other line-level effect. I avoided doing many of the tedious EQ shaping and tonal mods to counteract the inbuilt bass rolloff and key click filtering in the Recovery Amp by inserting an outboard EQ. I would still highly recommend removing the Miller capacitors on all of the Bus Amp inputs - these kill a lot of the key click.
Recalibrate the TWG - after you've removed all of the key click and bass rolloff filters, you'll probably need to recalibrate the TWG outputs as the organ will now be very shrill and piercing, especially if you're running it through an external amp or Leslie.

[vhm14u2c]

Tell you what I have after doing that skill 3 mod for keyboardpartner-
From article, what I should have, states-

“You now have 4' fast, 4' slow, 2 2/3' fast, 2 2/3' slow on the first four percussion tabs, leaving the remaining percussion tabs unchanged. Different loudness levels can be achieved by combining both 4' or 2 2/3' percussion voices.”

And from my own impressions after playing with all drawbars in/zero-

Tabs 1 and 2 are fast and slow , pitch is octave harmonic, so if I play ‘c', it's 1 or 2 octaves higher ‘c'
Tabs 3 and 4 are fast and slow, pitch is 4th harmonic, so if I play ‘c', it returns note higher ‘f' (I'm guessing this is the 2 2/3, only reason I say that, I pulled out drawbar 2 2/3, and produces same note)

I'm guessing that's correct, but not sure.

[Papus]

If you're stuck with just the internal speakers then it's worth removing the treble rolloff cap on the crossover, this will restore a bit of key click to the internal speakers.
I added a Radio Shack piezo tweeter in parallel with the 12" speakers to add a bit of extra bite when not using the internal Leslie.
But really you need to run your T through an external amp or Leslie to get the most out of it.
It is relatively easy to use the headphone jack as a line out - just run it into a DI Box with inbuilt attenuator, 20dB to 40dB of attenuation should reduce the signal to line level.
Or you could build a simple attenuator box with a resistor network (L-Pad or similar).
As you have a 200 series T, you should be able to tap into the Tone Cab output which is a convenient post-swell pedal, post-reverb line level signal available on one of the pins of the main amp board (sorry I forget which pin number, maybe 22? don't quote me on that!). The Tone Cab output is my go-to source for obtaining a nice signal right at the end of the chain, to send to external amps and other things.

[vhm14u2c]

I did do a distortion mod too (diagram by Kon Zissis) and had no change when utilizing either distortion mode(I'm guessing have to increase a trim pot somewhere)

using 3.3v Zener diodes and did not have bat46 diode on hand but have equivalent 1n5818, wired up on-off-on switch, have no change between all positions.
connected to pin8 of recovery board/power amplifier for center tap on switch and ground on the loose ends of diodes on 1 and 3 of switch.


one other thing to ask, which trim pot on percussion board increases ‘harmonic percussion' volume? Seems subtle at the moment.