¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. TekScopes
  2. Messages
Single Messages Topics Expanded Polls

Re: S6 Sampling Head Bridge Cavity Question

 

Hi Craig,

Funny you mention it. I have been thinking that there may be a tiny
possibility if I actually read the maintenance directions on the sampling
bridge cavity, which Hakan wrote out so nicely for me, that I might get it
to work again. It would only be an academic exercise since the noise was too
large to want to ever use the head.

The 577 amplifier is a work of genius. I had to read the explanation 4 times
before I understood how it worked. Why they did it that way is beyond me but
that is because I don't have a clue what problem they had to solve. But
understanding the theory of operation was not enough insight for me to
actually find out how to fix it. One of my 577s some years ago had hum
pickup on the most sensitive Vert current settings as I seem to recall.
Eventually I had to give up since I couldn't even see the hum because it was
so tiny. But after being amplified it was noticeable on the screen.

Dennis Tillman W7PF

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Craig Sawyers
Sent: Friday, June 15, 2018 10:12 PM
To: [email protected]
Subject: Re: [TekScopes] S6 Sampling Head Bridge Cavity Question

I see now that I have been stuck in an endless spiral of screw-ups
of
my own making. Fixing them has certainly kept me busy most of my
life.
But every once in a while I surprise myself by doing something
really
astounding (at least to me) and I think all this stuff I learned had
a purpose.

Dennis Tillman W7PF
Hey - don't beat yourself up Dennis. The head might not be bust, there
might still just be a duff connection.

You didn't do something really stupid, like me when I plugged a
harmonica connector one pin out on the power supply of my 577 curve
tracer (unplugged originally to find a dead tant). Blew up most of the
silicon in the thing.

I've now got it pretty much sorted, other than one remaining problem
with either the step generator or amplifier. Real nightmare to sort
out. Rather fortunately every piece of silicon was easily available,
and socketted - even the dual FETs, which are still made.

Craig



--
Dennis Tillman W7PF
TekScopes Moderator
Join [email protected] to automatically receive all group messages.