[AMRadio] BTA-250L Tech Support question please

[Patrick Jankowiak]

Does anyone know what the four large resistors (it's hard to see 
them all) mounted on the rails in the top right corner of the 
picture, high above the modulator tubes, are for?

http://208.190.133.201/bta250/pj_bta_250l_438f.jpg
and.. drum roll.. There's a power reduction switch. a small one 
which could not handle much voltage. What's the method used in 
this beast?

Thanks,

Patrick