At 03:25 AM 10/19/02 -0400, you wrote:
>Spent another frustrating evening trying to get the whine out of the
>pairing. It took considerable time to make up a connecting cable where
>each line was in it's own separate braid shield. And, unfortunately,
>while it subdued most of the unwanted oscillation, some remains.
>
>Walt
>
Walt:
I have not been following absolutely everything you have said about this
whine problem, but it does smell more and more of unwanted RF, or at least
ultra-sonic frequencies interacting. Some of my early (1953?) tube
contraptions would never work because I had pentodes oscillating at RF, or
whatever . . .
Have you tried simple RF-chokes in series at one or both cable ends? They
should not affect audio freqs.
Maybe this is a totally red herring, or however that should be said . . .
;^) (I think its probably funnier wrong.)
cheers,
Marty Michener
MIST Software Associates
PO Box 269, Hollis, NH 03049
coming soon : EnjoyBirds - software that migrates with you.
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>From Tue Mar 8 18:22:51 2005
Message: 23
Date: Sat, 19 Oct 2002 10:08:03 +0100
From: "Roger C Boughton" <>
Subject: MKH 105
Walter K asked:-
Have you had any trouble when pairing them for stereo? Like the
oscillation I'm getting out of the 110's? They run beautifully single,
but pair them for stereo and you get oscillation all up and down the
audio. I've done a awful lot of arcane experiments trying to put in
effective shielding without curing it.
The answer is no. In the early 80s the MKh110 came on the market at a
reasonable price 2nd hand, and quite a few members of Wildlife Sound Recording
Society bought them and the associated powerpacks that had been specially made
for the 110s requirements from a firm called Electrosound. Unfortunately this
firm is no longer trading, but their are a number still being used, in both
mono and stereo rigs, and results obtained are very good.
Regards
Roger C Boughton
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