[HAM] Any knowledge of E or H100 percussion??

[Kon Zissis]

Hi David and everyone.
I have been able to increase the bass level as well as the key click
spit factor of the  percussion signal in my 1962 C3  by simplifying  the
wiring of the percussion signal output high pass filter which is wired
between the points P and D inside the AO28 preamp. This has resulted in
a deeper , more woody sounding and also a more spitty sounding
percussion sound  in my 1962 C3 and this sounds very nice , especially
for Jazz/ Blues and Rock organ .I have also added a percussion volume
control because  simplifying the percussion output high pass filter
wiring results in a noticeably louder percussion signal and the volume
control allows me to set the percussion volume level back to the normal
levels or to any other  desired volume levels.
 
After successfully doing this percussion modification in my in my C3, I
then decided to try  boosting the bass level and the key click spit
factor on  the percussion signal output high pass filter in my 1963
L-102 organ. 
 
I was able to get more key click spit by removing the  treble cut
capacitor  and I then put in a switch  to switch in or out the stock
treble cut capacitor , but when I tried to boost the  bass level on the
percussion signal by increasing the micro farad  value of the  high pass
capacitor , there was a limit as to how far I could go because  when I
let the stronger bass level to pass through , there was also an
undesirable keying thump noise  audible with the percussion signal when
I pressed the keys so therefore this seems to explain why the bass
response is cut off so much in the L-102  percussion signal.  
 The percussion circuitry  in the L-102 is very different and inferior
to that of the AO28 percussion circuitry.
 
I have never experimented with an E-100 organ so therefore I do not know
how the percussion circuitry is wired up , but I suspect that the E-100
percussion circuitry might also be inferior to that of the AO28
percussion circuitry and therefore I suspect that the bass level of the
E-100 percussion signal is deliberately  weaker in order to remove any
keying thump noises. 
 
You might be able to get a mild increase in the percussion bass level by
increasing the mfd value of the percussion output signal  high pass
filter capacitor , but you might end up with an unwanted  thump noise
when you let in more bass level so therefore this will require some
experimenting.
 
If the E-100 percussion circuit does produce a keying thump noise like
that of the L-102 percussion circuit , then boosting the percussion
signal volume level and then cutting down the treble  might still end up
producing  the keying thump noise as well as dulling down the key click
factor of the percussion. There is also the risk of unwanted distortion
in the percussion signal. Even so , it is still worth experimenting and
then seeing if any improvement can be made.
All the best.
Kon
 
 
David Wells wrote:
Does anybody have knowledge of why an E100 has the bass utterly choked
out of its percussion signal?
I've rewired its post perc-matching transformer circuitry to h100
specs...little or no improvement. I then replaced the 33k between the
push-pull output of the transformer with 330k, much louder overall but
still no bassier.
 
Is it possible that the bass gets choked out via a lack of primary
inductance in the transformer?
 
 
Should I make the signal as loud as possible then attenuate the treble??