15 Dec
2007
15 Dec
'07
1:58 a.m.
On Fri, 14 Dec 2007, Mike Loewen wrote:
As someone who had to replace those heads (while the
drum was spinning,
mind you), I can tell you that's NOT the procedure. :-) You hooked a scope
to the read amplifier, then SLOWLY turned the screw until you started to see
a level, then adjusted it for the proper output voltage.
And I am someone who had to replace (better: relocate) some heads on a
drum this year ;-) This was because of a "squeal" that the drum suddenly
emitted. And yes, you need your good old Tek 555 to properly adjust the
head. One channel to the bit clock, the second to the read amplifier, the
third to the read F/F and the fourth to the word mask.
You're correct, it was not a flying head system.
Surely not. I think that the OP was thinking of a fixed-head disk which
sometimes was called a "drum", too.
Christian