Rob, it is a crosshead
It was very useful in keeping the Servisol from running on to the front panel!
Yampy, it is certainly a beast. The power reserves are very impressive, as is the build quality.
I have been listening to it all afternoon and it has not missed a beat and was very pleased that there were no real faults with it. It has never seen any repairs until last week, a real testament to the quality of its components.
Even at full volume with no signal, there is no noise or hum at all.
I really love equipment of this era, it looks great and I am sure it will go on for another 36 years.
Mark