On Mar 14, 1:25*pm, WA6LZH wrote:
On Feb 9, 11:06 am, "COLIN LAMB" wrote:

Hallicrafters had some very competent engineers, and they solved the
mechanical problem of the SX-100. *Their solution was the SX-101. *It is
clear that they needed to add both depth and weight to solve the problem..

Consider the SX-100 as the Narrows Bridge (Galloping Gertie). *The SX-101
was the replacement.

73, *Colin *K7FM

I have considered replacing the steel cables with regular dial cord. I
have not got around to it yet but I think the idea has merit. One can
only describe the mechanical instability/microphonics as "Guitar
String" like. Otherwise the tuning capacitor layout is similar to
other receivers of the era.

Tony

I have my SX 100 mounted in a bookshelf and mounted a 117v muffin fan
to the bottom of the shelf above blowing air across the top to keep
the temp fairly stabile after warmup. It has cut down the drift. I
also found that by not setting the speaker directly on top of the rcvr
it cut the microphonic tendency. This also was also true of several
other Halli's. These solutions worked for me and I did not have to mod
the units in any way. I think I would keep the steel cables because
they will last forever over dial cord unless you really trace down
noise to them. 73 Mike KF6KXG