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Hi Tom, Thank you for your answer. The fact is that I get the same plot when I connect any channel to the calibrate source or an external waveform generator. Also, I checked the callibrating waveform

Dave, My error. It's an "A" model. Ray

Ray Is it a TM502 or TM502A ? I can help you with the later Dave ArtekManuals.com -- Dave Henderson Manuals@... www.Artekmanuals.com PO Box 175 Welch,MN 55089 651-269-4265

Looking site to download a manual for my TM502 (it holds my SC504 scope). Bama doesn't have one listed nor do I see one in a web search. Anyone able to offer any help? Your attention is

Can you connect the Channel 1 input to the calibrate source? That would tell us a bit more. But yes, the very FIRST thing to do is pull the case off and measure the voltage and RIPPLE on each of the

Francis, Ten thousand comedians are out of work and you have to try to emulate one. Shame, shame! If you fine a market for them, please let me know. I want to help. TIC, Tom

Glenn 1)Go get a copy of Chester Karras book on negotiating and read it ...( "in business as in life you don't get what you deserve you get what you negotiate" 2)Remember this is a PAWN SHOP, not

Hi, I would like to repair a 475 oscilloscope, but I don't even know from where to start. I attach a picture of what I see, almost regardless of the time and amplitude controls. The intensity and

The extra three markings on the Volts/Div knob are there for use with a x10 probe, which enables a different lamp behind the Volts/div skirt, so the 5V/Div setting is mechanically the same as the

Hi Tom, how much do you pay for a broken CRT? Obviously, it's more valuable than a good one, because it takes a lot of time and skill to break it properly, in addition to the purchase price. If

Dan, I can speak for only Israel Post, because that is what I know. IsraelPost is an efficient and honest organization. Customer service is first-class. This applies to Priority or First-Class mail

Hi David, I sampled rear panel ch2 vertical signal per your suggestion. It's coming out at only 1/20th the signal true amplitude. So maybe R403 should be examined? However, a confounding symptom,

From Tim P (UK) What is meant by 'external arms calibration box' for the Type 'Q' plug-in ? is it just 4 120 Ohm resistors in a bridge formation ? many thanks Tim

Local pawn shop has a 2215A in unknown electrical condition, good physical condition. What is a good price to offer for this scope? There are no returns and no guarantee as to the functionality of the

Bob, I would be very interested in those 'scopes.? I live in the San Fernando Valley and don't get out your way.? Is there some in between place we could meet? Bob K6DDX 818 894-2887

Yes, they were connected. They are the Ch1 and Ch2 analog signals to the Acq circuit. Thanks, Tom

That note on Sphere's site is interesting. The only comment I have is he recommends using a 1N4004 diode. They are way too slow for use in the inverter circuit for the -100 supply. The slow Trr will

Interesting, When you swapped the tube on the 2232 did you have the 2 flying 4pin leads connected to the top board? If they are unconnected the display is all over the place. JC

Thanks for the link. It makes for interesting reading. At the very end, complete conversion kits are mentioned for specific instruments like the Tektronix 500 series CA amplifier and the

Then why, when I installed the -00 tube into the 2232 scope with no connection the pin 12, the display was completely unstable when the beam moved around. The image size varied depending on where the