bad sine wave?

Posted: 4/25/2006 6:30:34 PM
organ man

From: Kalamazoo, MI

Joined: 3/20/2006

Hey everyone,

I've finally completed (on a piece of plywood)my replica of a AR-1264 thanks in large part to Mark McKeown and Arthur Harrison. With the help of my boss I got the think to make some noise but I have a couple of things bothering me.

1) the 1000pF capacitor used in the pitch oscillators didn't work. I had to lower the capacitance significantly to get any noise. I measured my oscillators at about 250k instead of the stated 170k or so. Can anyone explain this?

2) More importantly, i have what has been described to me as a bad sine wave sound, especially in the bass. I've changed tubes out and tried putting variable resistors (per the Clara Rockmore Schematic) in there and I'm at a loss. My theremin doesn't have the nice cello sound in the lower end that I hear in some recordings I've listened to.

Can anyone help me on either count.

P.S. I've been practicing anyway. This stuff is fun.

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