[Hallicrafters] SX111 vs SX111 Mk 1

[Mark Bell]

How to tell the differences.

Inquiring minds want to know!!

The SX111 has 13 tubes,  and the SX111 MK 1 has 14 tubes.

Look at the back center of the chassis top.  The SX-111 has C69 there,
and the SX111 MK1 has the 6BY6 Productor Detector Tube in about the
same place.

I scanned in the tube location figure from both manuals, combined them with
a few arrows etc.  They're at

www.qsl.net/k3zx/sx111_vs_sx111mk1.JPG

73 Mark K3ZX