Another point - download both service manuals and take a look
at what's involved in fixing each of them.
The 46x series tends to develop bad filter caps and rectifiers.
It is possible to replace them without taking the entire scope
apart, but not trivial. It is also possible to fix most boards
without taking everything apart.
On the other hand, I've never had my 453 open and I've had it for 15
years. I probably should fix the fan in it one of these days, it's
getting a little noisy.
