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Hi Leo, The S-4 and S-6 were designed by George Fry. They were a radical departure from the previous, much slower sampling heads. I once asked George why they were faster and he said it was because he

Wow!!! Leo, where did you find that information? Does anyone reading this know if any of them might have some schematics in a box some where? I'd really like to prevent these from all dying off for

I fixed it, a purple wire soldered to the board broke loose and now it works, when in doubt recheck the wires something might have come loose Thanks for the reply

Hello All, I have a 585A scope that has me stumped.. the LV voltages are out of spec and I cannot find the problem. Here are the voltage readings; -150 = -182 -100 = -115 225 = 263 350 = 409 500 = 587

Hello All, I have a nice 585A scope that has me stumped. The LV power is out of spec and I cannot trace the problem. Here are the voltage readings; -150

Exceedingly so. You need to do the calibration sequence for the storage section. -Chuck Harris DW wrote:

I think most heads were designed by Agoston Agoston. Other than that: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This product was made possible by the dedicated efforts of a group of

Well summer is rapidly passing me by and here I am sitting watching Netflix while my wife makes a pie. Wondering what to do. I have an original 535 in the garage with no tubes and a messed up AC

I confirmed I am getting 370V, maybe this feature is know to stop working?

I recently recapped the power supply of the 577 and only had to slightly adjust +30 -30V, when I went to use the D1 storage option the screen doesn't show a faint green background or store the trace

Thinning out my collection so l’m offering an excellent operating and cosmetic condition 2465BDM scope for sale. A5 board has new SMD caps (no leakage damage) and a new socketed NVRAM module.

I have two 576, if you told me which test you need to compare, I will do it with mine. Do you know ferrite core specs? Could be changed some transformer HV turns for a voltage multiplier? FERRITE CORE

Might be helpful, a 1978 transistor reference manual https://ia600607.us.archive.org/34/items/NationalSemiconductorDiscreteDatabook1978/NatSemiDiscreteDatabook1978.pdf

Hi, Well, that is what I have and will continue to use ’till I win the lottery; since I don’t play…' larry

The P6139A was designed for the 500 MHz TDS-series (TDS500 e.a.). The P6137 was designed for the 2465B. Raymond

Reg, The display jitter; Is this timing/trigger related, or a problem with the display, ie. CRT circuitry proper?

I plan to browse chipxs regularly. This is hardly an NOS SD-24. Last cal was 2011 due next in 2013. Measured rise times are ~14 ps with uncertainties of 4 ps. I am extremely pleased with it. I did

The 2465B originally shipped with P6137 probes. They too are difficult to find in good condition, and at a good price. Many cheap probes will work, how important is signal fidelity to the user? Tek

Hi Mr. Hanselman (may I call you Steve or Stephen?), Are you related to Professor Hanselman at UMO? I see you are a disabled vet! I’m a 100% disabled vet and it is great to see you have your own

Or send them to me and I’ll upload them. DaveD Sent from a small flat thingy