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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

I will try, old farts disease, to check our spare parts box. We have about a cubic yard of scope probe parts, but I think I’ve looked for the 6139 stuff before. I’ll let you know and then drop

Just send them to the TekWiki upload address. As long as their contents are clear from the file names, they can be added to the bottom of the “Manuals” list on the 1L20 page. DaveD Sent from a

Hello everyone, I recently sold my ‘extra’ 2445B to a friend. It was a very good system - had had the fan replaced and was exceptionally clean; the caps all checked out etc… Why did I sell it?

Thanks David for your generous offer; Where do they get the cores to make a compatible transformer that works in the 576 circuit. This is not a 115v 60 Hz transformer. A friend suggested a plate

Hi Jon, The 2465 supply is such a reliable supply that there should be no need to keep spares. Recap yours, replace the RIFA X2 caps (0.068uf), and it will go the next 40 years without a hitch. It is

I was looking at my 1L20 manual and never noticed before that it had two bulletins in its back pouch. 050-0474-00 replacement of Q310, Q340, Q350 for 1L30 1L30 1L40 491 and 050-0348-00 replacement of

Hello all restoring a fine 2465B opt 06, 09. The PSU needs recapping and may have other faults. I would like to have a spare as I have other units. If anyone has a spare PSU that works, I am

Hello all, I did contact Sphere in Canada no response so far. The 3D process can reproduce shapes but the materials are always inferior to the original material, due to the 3D process. Finally a kind