Of course, just for vintage warm fuzzies, little can
challenge an old Tektr=
onix scope. I recently acquired a Tek 561A from a friend locally. Mmmm, v=
The 560 series are small and relatively simple. Now, what yuu really want
is a 545 (early model with the distributed amplifier) or 547. And what
yuu swap your firstborn for is a 555 (not the timer chip :-)).
The 55 is a complex instrument. Double beam (and therefore with 2
distibuted Y ampliifers). Double timebase (you cna use one for each beam,
or use one to delay the other in the typical Tektronix fashion). Double
EHT supples. Even double boxes (the PSU is a separate unit).
Oh, and even the heater supply to most of the valves is regualted, by a
circuit that takes into account the RMS value of the waveform.
acuum tubes.... Turn on the scope, go get a beer
while it warms up, measur=
e and test with confidence. -- Ian=20
The 'real' 500s have a time delay relay. All the valves warm up, then
this kicks in and the HT rails appear. If the 'scope is working properly,
as soon as the relay fires and you get something on the screen, the unit
is useable.
-tony