开云体育

Thanks for clarifying that, Chuck. Was there a different model where that was a problem? I seem to recall the issue but don't recall which model(s) were affected. Hopefully I'm not crossing up Tek and

All of the capacitors on the 2465 supplies have their polarity markers pointing in the same direction. A few are non-polar electrolytics, which don't matter. -Chuck Harris wrote:

Shielded mains cords just move the noise to the next open spot, which is the unshielded plastic boxes, and unshielded ROMEX wiring used in most USA houses. Better would be to put one of the snap-on

I don't recall exactly to which model(s) this may apply, but I think one of the 24xx models have the polarity marked incorrectly on the PC board for one of the filter capacitors. Apologies if I have

Hi all, what is an OK functioning Tek 2205 worth in terms of replacement parts? Does it have anything that's worth in order to repair other scopes? I have someone who might give me one of those for

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”;