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I’d be interested in buying a 4xx Series Trigger Knob, preferably from Europe. Does anyone have a spare one they’re ready to part with? Thanks

sold

Welcome Stefan! Enjoy this forum. ?You will find very knowledgeable and nice people. Cheers

Still available. See for details: /g/Test-Equipment-For-Sale-Wanted-or-Exchange/message/3170

I have a Tektronix 485 in great condition for sale. I have maintained it for many years, but have several other portable Tek scopes, so selling this one. Comes with cover, CRT EMI screen, and two

Reminder, Tektronix PS503A Dual Tracking Power Supply Module for sale Details at:

Any large Transformers or other AC magnetic sources in the local vicinity of the Oscilloscope? You might move the Oscilloscope away from the area and try it to see if the problem goes away. Ross Sent:

Dear Chuck fine to hear from you! Perfect answer re the jitter adjust and 2467 MCP intentionally slightly wobbly.... Bon Soirée Jon PS here in Paris, just received a fine 7L5!

i'll check the vertical jitter adjustment but it won't be until later in the weekend. Richard

Hi Richard, I cannot think of any way you could have 50Hz mains injected into the vertical amplifier (after the channel mux), and not have it injected into the horizontal amplifier. Check the vertical

Hi Jon, I am well. The 2467's have the feature of moving the readout to prevent burning the rather unique MCP (Micro Channel Plate) CRT, but that feature is disabled when the firmware is used with a

All four channels are affected, grounded or not. The Alphanumerics are similarly affected.

Trace it back to the imput to see where it comes from. Does it do it if the input is set to ground or 50ohms?

Unfortunately I'm not able to check voltages right now, the instrument is in my shop and my tools are in my workshop - a few miles away..... Tests reveal that the wobble is in the vertical amplifier,

Chuck, great to see your excellent notes on general troubleshooting...long time, How are you doing? Agree on the bus and 15 V PSU caps notes. The bus caps are ample for 50 or 60 Hz mains. Could the "

First things first: When you get a new piece of test equipment, you should always measure the power supply voltages, and check the ripple. When doing the ripple measurements, you will need a scope,

50Hz - I'm in the UK, our mains frequency is 50Hz and can affect things if the power supply smoothing caps are not too good....

no idea what the "50 Hz mark" means. does wobble change with any setting eg time/ div? vert pos ? Refer to the service manual J119 A1 board check every power supply V and ripple bon chance Jon

I've recently acquired a 2465B. The instrument powers up okay but the display has a vertical wobble (about the 50Hz mark..) which affects both the trace and the alphanumerics. I'd think it's power

Thanks Dave and Jeff- Definitely need "Electronic grade" ie no acetic acid....I had been looking at data sheets all the consumer grade stuff- (easy available locally)- does not even spec dielectric