A friend's TS520SE was said to be blowing fuses during xmt. He was advised by someone to replace the driver and finals - dubious advice without first looking further first IMO. He bought the tubes and asked me to help with the neutralization procedure. I put the tubes in as asked, hoping to do the procedure and found no output all. Didn't blow fuses, but didn't xmt either. I'm not familiar with the radio except for what I've stated here. Any suggestions/experience? Thanks.