Thanks Arden, I’ll give that a whirl this weekend.
toggle quoted messageShow quoted text
On Thu, Jan 2, 2020 at 2:04 PM KB6NAX <gumbear@...> wrote:
Sounds like Panos has a clue. Switch in the 20 MHz bandwidth filter to
if the erratic triggering stops or lessens. Too much bandwidth can be a
problem in a noisy environment. If the triggering in 20 MHz mode still
up there's something noisy in the triggering circuits.
Sent: Thursday, January 02, 2020 5:58 AM
Subject: [TekScopes] Tektronix 2245a Flickering Trace
Hey guys, newbie here. First of all I want to say thanks for what a great
resource this place is! Made my donation two days ago.
I have a Tektronix 2245a, which I bought about a year ago. This is my
scope, and I’m still learning how to use it. I have replaced all the power
supply capacitors, and all the voltages test out OK., and the unit runs OK
when I first power it on. After about 10 minutes though, I start to get
ghost traces and a jumpy, flickering image. Here is a link to a video I
of the unit. https://youtu.be/j6Dqke1CIRE
It is usable for what I do, which is just viewing a signal after it’s gone
through a tube amp, but I would like to track down the issue. Any
suggestions on where to look?
Thanks everyone, Bill