More to come on this subject, I suspect. I read that unless the voltage divider is effectively decoupled from the power transformer properly it can overheat it, and admittedly not knowing how to do this, I erred on the safe side and out it came. Welcome to my modpage for the venerable and deceptively excellent EICO HF-81. That's it over there on the right. It's an unlikely looking beast, but has some very nice attributes.
Truth is, there are few amps that sing so well.
And, might I add, it has balls in abundance. However, I seemed to constantly run into bad solder joints as I ran through it replacing nearly every cap and quite a few resistors in the thing, so be on the lookout. Your experience may vary. Of course, a schematic is essential. Then, if you need one, you can order a full-blown Xerox of the whole manual from A.G. Tannenbaum .