The trigger hybrid triggers the A and B time base hybrids, and they feed their gate signals (/SG) into the the PAL U975, which chews on them, and feeds FF U980B, which talks back to the PAL, which

I tried cleaning and deox'ing the Trigger Hybrid, but the problem remained. Swapped it out with another chip, and still not change, or at least no meaningful change. (Curiously the error text from the

Hi Greg, The P/N for the fan motor in the 8640B manual (TM 9-4935-601-14-7&P) shows it to be 1AD3001-OA. Thanks, Barry - N4BUQ

It was pretty stupid of me to forget the link. This is the email I wrote years ago: Note: the link is broken across 3 lines. It is very hard to find this battery pack on this site so use the

I have washed many 500 series scopes (and other boatanchors) over the years without any fancy equipment and have had very good results. I posted a set of photos a few years ago of a 547 wash and you

Barry, The fan in the HP 8640B is a simple 2-terminal DC motor. The Siemens device is a 13-terminal brushless Hall Effect motor that requires external excitation from a more elaborate switching

https://www.bulbtronics.com Part # 5149 The search for Oscilloscope 212 doesn't work, but its listed under the "Equipment using this product" tab.... David verizon.net@groups.io> wrote:

Please share the link you mentioned so I can check out their batteries. ALSO, beware that the power supply sections of some of the "2XX" models that use these batteries will not regulate unless a good

Hi Bob, Years ago I posted this information about the batteries I found for the model 214 which I own. With a little research comparing the battery size of your 211 to my 214 I think you will find the

I have a 2465A but don't have any idea where a motor like that is used. Any help?? Thanks, GerryR KK4GER

I'm not 100% sure, but I think that same motor is used in the HP 8640B (and, possibly, other models) as well. Thanks, Barry - N4BUQ

Yesterday I bought a model 211 scope at the Dalton hamfest. While it works I need to replace the batteries. He seller already has the batteries out and I assume they are bad. It works without the

Hi Mark.. Thank you for the links. Seems those threads have gone quiet. It might mean that the developers had no plans to offer a commercial outcome, but they supported open sourcing, or demand isn't

It is Tek part number 147-0035-00 and will fit Tek 465, 465B, 466, 464, 475, 475A, 475M, 2445 & 2465 series scopes. Greg

Power supply voltage and power quality are the foundation of everything else. This was and remains the most important lesson for me when working with these scopes. -- Michael Lynch Dardanelle, AR

Thanks, Chuck. I'll do a careful inspection and deoxit cleaning of the Trigger Hybrid chip. I do have a 2465 (two, actually) that I can borrow a known good chip from if necessary as well. Tony: As

That means that the trigger hybrid, which does all of the time and frequency measurements in the "B" model, is having trouble triggering on the signals you are presenting to it. You can try removing

Let me know where are the pictures, when I went to TekScopes.io there aren't the picture you are referring to. Have a great weekend.

Albert, Thanks! That was it! I have never seen another one of these. Steve

Hi fiftythreebuick, A thread about the 555 is a great idea. It could be very educative for those of us who have never seen one in person. For example, you could describe what is your convenience of