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Ozan, I do know these can be swapped in some manuals. I made sure to change the parts one at a time to make sure. It is good to remind us to keep from blowing parts. Anyone of us can make a mistake

You may already know but at least in some service manuals component placement diagram shows location of C1132 and C1115 swapped (wrong). This was the case for my 2467B, I assume it also applies to

iv3ddm C1132 would be 160V. C1120 can be 100V. C1130 would be 160V. If you want to use the original values of capacitance, fine. They can be higher capacitance if you want. C1101 and C1102 would be

I’ll be more than happy to take it. Cheers

Free to a good home: Ciebo DS-750 development tools kit for Philips 87C750 I expect this is largely limited to historical interest, but I hate sending this to the landfill if there is the remotest

Mark, Reach out to Chuck Harris on this list. He replaced my NVRAM. Not sure if he would do just a board or well he needs the whole scope, but you can ask him. Mark

Sorry Mark, I ask for 2 clarifications: I should use 647-ULD2C100MPD1TD (10uF, 160v.) Also instead of 10uF, 100v. (C1120 etc.) or only for C1132? Which are the capacitors where to use of the

It's strange. With a DMM I could not find a connection of 2N2907A-base to any other component in the neighborhood or a A/B contact. But then the pair of NPN transistors with their bases to the B7 and

Your comment about cathode resistors for bias stability will force me to do a little more background checking, but I don't think indirectly-heated cathodes were in production before 1929, so there

The reason it didn't happen for electronics until 1927 is that the preoccupation until that point was getting more gain per tube. Positive feedback (Armstrong's regenerative amplifier) was the magic

Hi Mark, I can't help in replacing the RAMs, but I have some experience with the 2440/2432 etc DSOs. Don't be afraid to replace the RAM without saving it's content, it is much easier to get calibrated

I don't know about this history, but am surprised that this didn't happen until 1929, well into the electronics era. Surely the concept of negative feedback in control systems has existed in nature,

Tom Lee wrote ... Yes, Black invented both feedforward and negative feedback amplifiers, the latter indeed on the Lackawanna ferry in that year. Tom is right, our hero Harold

Nice work.... I'm thinking of re-activating some equipment.

If one wants to understand electrical noise, the only book that I have ever found that treats noise as a subject in it’s own right is Vasilescu’s “Electrical Noise and Interfering Signals”;

:) 5-year old: "What's wrong, Mister?" Teacher: "I have a headache." "It might be a tumor." "It's not a too-muh!" (Arnold Schwarzenegger, Kindergarten Cop) -- Tom -- Prof. Thomas H. Lee Allen Ctr.,

I wondered what that thumping sound was... it was Tom banging his head on his desk from 2000 miles away :)

Yes, Black invented both feedforward and negative feedback amplifiers, the latter indeed on the Lackawanna ferry in that year. I'm not sure what oddity you were referring to. But, negative feedback

Odd, when I was in school we were taught that negative feedback amplifiers were invented at Bell Labs. By Harold Black. In 1927, on the ferry. All amplifiers add noise to the signal as it passes

The noise that is coming back through the feedback channel and being negatively combined at the differential amplifier on the input is not the same noise that is coming in the input. It is random, so