Electric valves
By Horst Mohr
Hello editor,
first let me thank you for putting me on the mailing list.
The electric valves we used for Dr. Hockers grands are built by Dr. Tenten and I suppose, he will write something about it. My work was the software and the way how to energize the valves. Just let me say, that I recently played a grand of Dr. Hocker via MIDI from my keyboard for testing purposes. With the pumpmotor of the grand switched off, you can hear a light "clicking" of the valves. Not very loud, as the housing is inside covered with felt and a kind of tape is glued between core and armature. When the pumpmotor is active, so that the piano plays, you can hardly hear the "click". But as we talk about musical instruments there is still something to do to make that little noise absolute unhear- able. ( How to silence the motor and the roll mechanism ? ;-< )
BTW: 88 notes are played with MIDI in ca. 80 milliseconds or ca. 60 ms in running mode but never really together at once :-).
I tried to send you a uuencoded "rondo alla turka of W.A.Mozart" but mail refused. Tomorrow I'll try again.
Best regards, h. m.
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mohr@nemeter.dinoco.DE H. Mohr Koelnerstr.49 51515 Kuerten 02268/1561 |
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