Re: 22H still humming and I have a 147 next to it that works fine. Somewhere along the way I have nothing connected to pin 5 on the hummer. I am in over my head here,people...HELP !!!
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Is it safe to assume the H22 won't likely work with a Leslie preamp pedal by rewiring the pins to match the pedal?
On Fri, May 12, 2023 at 16:01, Chris Clifton <clifton.christopher@...> wrote:
Seems that everything about this may not be standard. A stock 147
has a switch next to the volume control marked "Console load" with
three positions, "Open", "16 ohm" and 8 Ohm". In a normal
installation connected to an organ with built in speakers, this is
set to whatever resistance best matches the impedance of the
internal speakers, (In practice, I usually set it to 16 ohm. I had
many service calls where the 8 ohm resistor had burnt out. As this
resistor is half of the 16 ohm load, this resulted in all three
settings becoming open.). The open setting would normally only be
used in multiple Leslie hook ups, only one of two or more Leslies
would need to have the load resistance set, or with the old Leslie
combo preamp pedal. The 22H was not intended to be used be used
with organs with built in amplifiers and speakers. The main use
for H series or 122 type Leslies was with Hammond organs with the
G-G output terminals on the organ pre-amp. A kit was available for
connecting to other organs, but a 147 or W type Leslie would be
the first choice for most organ with built in speakers.
I don't know what you did to try to make the 22H amp compatible
with the 147 type hook up, ideally you would have rebuilt the
amplifier to be more like the type 47 or W Leslie amplifiers.
Simply rewiring the input socket might work, after a fashion, but
the input stage would ideally need to be rewired to be identical
to that used in the 147 type amplifiers.
On 12/05/2023 19:02, john
alluneedtoknow via groups.io wrote:
As for the load resistor Chris advised,the working amp doesn't
seem to have one,just wanted to point that out.
Regards,
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