All the schematics you'll find below are quite large, enough to keep the value of the components readable. They will certainly not fit completely onto your screen, but you can scroll through or save the GIF on your disk (click with the right button of your mouse ON the schematic and choose the option "Save Image As") and print it with a common bitmap program.

I haven't tried every schematic listed below, so I can't assure you of the quality of each of them nor that they are error-free.

A word about units

Caps values are indicated in the following manner:
F = 1 Farad
mF = millifarad = 10-3 = 0.001 Farad
uF = microfarad = 10-6 = 0.000001 Farad
nF = nanofarad = 10-9 = 0.000000001 Farad
pF = picofarad = 10-12 = 0.000000000001 Farad

For resistors, I usually don't indicate the word "Ohms", just the value of the resistor:
560 = 560 Ohms
560K = 560 Kilohms = 560000 Ohms
560M = 560 Megohms = 560000000 Ohms

And for chokes:
H = 1 Henry
mH = 1 millihenry = 0.001 Henry

In formulas, if not mentioned otherwise, the units are the main ones: Farad, Ohm, Henry, ...

!!! Warning !!! Tubes involve high voltages. High voltages are not a joke, pay particularly attention to capacitors: they keep their high voltages a long time after you switch off your amp.
When touching the inside of an amp you've just switched off, always use one hand and only one hand at a time.
Never short-circuit a charged capacitor, the power is huge and dangerous !