Etherewave Pitch Tuning Problem

Posted: 8/15/2020 11:07:42 PM
oldtemecula

From: 60 Miles North of San Diego, CA

Joined: 10/1/2014


Thierry said: "In the Etherwave Standard and Plus, Hammond 1535G inductors (10mH,710kHz,31R) are used in series with the pitch antenna, and Hammond 1535D (5mH,1MHz,14R) and 1535B (2.5mH,1.3MHz,7R) on the Volume side.

The Hammond 1535 series inductors have recently become obsolete, but most distributors have still sufficient stock. The only alternative, the Bourns/J.W.Miller 630x series, has already become obsolete almost 10 years ago, they are very hard to find.
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The 1535G has a SRF of 79 kHz, that would be 180 degrees out of phase per dewster, would work better in Australia.

Moog must get these specially made, like their earth ground AC transformer. The EWS seems to be increasing in demand.

I gave a solution of what to try if all else fails. A post without a link to a source is just as silly.

This coil shortage is to my advantage as I really like the EWS wood box. It is an accepted standard

Christopher

Edit: The Moog PCB is fragile so I would clip the wire leads on the choke up high and solder to them rather than attack the paper thin copper foil on the PCB. This way you do not have to remove the board.

Posted: 8/16/2020 2:33:41 AM
dewster

From: Northern NJ, USA

Joined: 2/17/2012

"The 1535G has a SRF of 79 kHz, that would be 180 degrees out of phase per dewster, would work better in Australia."  - oldtemecula

79 kHz is the Q test frequency, the minimum SRF is 0.71MHz.  Your lack of basic electronics astounds me anew.

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