[HAM] Wax caps measured and then placed in four pans....

[Ian Hooper]

The filters are there to REMOVE spurious overtones.. crosstalk from adjacent
tonewheels etc. They are not high-q resonant filters, but in practice,
something closer to a fairly broad pass-band circuit. 

Given that.. a out-of-spec filter assembly could allow MORE of this
extraneous 'noise' through... which, if measured with a voltmeter, will
register as a higher-amplitude signal. The actual amplitude of the desired
frequency may not be higher, it's just accompanied by a lot of extra
'crud'(which a simple voltmeter will register).  If you want to hear
something truly horrid, listen to the signal directly from a tonewheel
pickup - sans filtering... rumble, whistle, overtones - the word 'harsh'
fits. YUK.

I have some very good bench meters, extremely accurate, calibrated, but none
of them have a measurement range for 'good sounding Hammond' -  I'll let my
ears be the final judge.

cheers,

ian 
 

-----Original Message-----
From: hammond-bounces at zeni.net [mailto:hammond-bounces at zeni.net] On Behalf
Of Brad Baker
Sent: November 22, 2006 7:12 PM
To: The Hammond Forum
Subject: Re: [HAM] Wax caps measured and then placed in four pans....

<snip>

However, if the filters were tuned by selecting caps to peak the filter at
the tonewheel's frequency, then how could a mismatched cap, one that
mistuned the filter, result in an amplitude that could ever be *louder* than
stock (leading to the shrill sounding organ)?  It couldn't.  So something
else is going on here:
<snip>