I usually sock away at least $50.00 a month, some months a bit more, just for surprise repairs. My first tube lased 4 years, my current one has been in a year, and still has time to go on the warranty. $50 minimum a month won't break the bank, and if this one also lasts 4 years my 'service bank' will have about 3k+- in it which should look after most repairs. I did the same thing when I put in my digital duplicator several years ago. I banked away a 1/4 cent per page printed, and when it needed it's first service it had 1.6 million imprints on it, and I had 4K in my 'print bank', more than enough to bring in a service guy to get it tuned up and running perfect again. Think of the future, salt something away..