Hi jon,im supprised by the lack of responce from the tek io groupe,my main issue is running the scope to check transistor base voltages in the vert amp section with the crt removed as its nearly imposible to probe them with the crt in the scope,but im wondering if i power it up without the tube in,will the eht rise to crazy levels and kill something,thats where i am at at this moment in time,sort of chicken and egg,i have the correct manual,but on a pdf its hard going,i much prefer paper! 73 m3vuv.