Are you saying you only see the ghosting with the magnifier on? If so, I don't think there is anything wrong with your scope, that's just how the scan expansion CRT works.

No other suggestions? Googling didn't produce much more information other than it may be related to high voltage stability - one person replaced diodes and capacitors in the switching PS (voltage

Pickup or freight only in San Diego. Needs repair. Ebay 390943192224 No affiliation. Jay

It is a 151-0341-00 or 2N3565.

I've built several, two from scratch, and some that were almost totally reworked heathkits. Things are much easier if you start with a low deflection voltage CRT like a 3WP1. Most of the "cheepy"

Welcome to TekScopes. If you're a new member, please introduce yourself to the group. Tell us your interests. Regale us with your Tek stories and collection. Please edit replies to the list to reduce

Manfred, I'm in awe. That's just pure genius! Well done! I never had a scope of my own till a few years ago. When I was a kid, like your poor, undeserving student, I had no money to speak of. My

.. brings back some memories of my first scope, which I built aged 14 in the 70's...... I had picked up a scope chassis, tube and mains transformer at a radio rally - a friend of mine found a

Hi Manfred and gang What a fantastic write up, many thanks for taking the time to share it with us. It brings back memories of the PW (Practical Wireless magazine) Student that I built while at

Ok, I now know more about a DM501 than I ever thought I would. It started with a bad latch, progressed to blown power supply transistors, and wrapped-up with a blown floating supply as well. I then

I retired from the USAF in 1956 after 4 long years in Albuquerque, NM and took a job as an electronics technician for IBM in Kingston NY. I eventually wound up as a bench technician working on

This applies to any of the regulators which use the external pass transistors but you can do it with a PS-50x power supply. The easy way uses a function generator, oscilloscope, and resistive

I had a Lavoie LA-265A oscilloscope found at a garage sale which is a clone of a Tektronix 545A.

Manfred, SPECTACULAR! I hope we get to meet some day. We have a lot to talk about. I was hooked when I rebuilt a Dumont scope. David is right about Reed. There are more than a few like him and

I had Teks at work, but before I bought a 453 for myself I owned an HP 141A with the 20 MHz vertical plugin. The Tek 453 was used in both home shop and in the field for more than a decade, but the 453

Indeed that is an impressive project. My first was an Eico kit my parents got me as a birthday gift. I was probably about the same age, 11 or 12. It used tubes and I remember it not working when I

That's pretty cool. My first 'scope was a Dumont. I don't remember the model. It was given to me when I was about 11 or 12 years old (say, 1968 or so) by my uncle who worked for Fisher Scientific.

Manfred- What an impressive project. The old adage "necessity is the mother of invention" and it is certainly true in your case. I'm thrilled to have seen it. Phil kd6rm

Do you mean at the power supply (e.g., PS-5-something) output?

Oh, yeah. Duh. I forgot about those.