I hope this article might be useful to all whom have burn the switch band of TL-922. As most of you knows the switch-band is no longer available in the market. When I learned from internet that someone has substituted the switch-band with a Vacuum-Relais I decided to try this. I bought a dozen of Kilovac HC-1.
This is the component to be blamed for the damages to the switch band.
I have noted some signs of burning on the contacts and when I tried to activate it manually I noted that firs the first it was closed the ingress contact and than that of the antenna. This men that the power was not sent directly where needed and the contacts of the switch band were burned. Had I changed this with two Vacuum-Relais I would have immediately resolved the problem.
I strongly recommend this changes to all owners of TL-922. It does not cost a lot and resolve many problems of this amplifier.