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IIRC, analog computers predated digital computers, and may well have been simply (and firstly) called computers (with anything else called a calculator). People redefine terms based on what they know

I recall walking Canal Street in lower Manhattan in 1976 during a vacation trip with my parents. It was store after store of surplus electronics. Better than a candy store! Remember buying bunch of

Excellent! Good Work. -- Michael Lynch Dardanelle, AR

Indeed, well done Jeff. I was pretty pleased when I fixed a similar Z amplifier issue in a 603. At first the intensity and focus controls were non-responsive. After suspecting and testing almost every

A little bit of History, on Nov 4, 2020 I wrote the following:

The subject of analog computers has brought a few thoughts forward. I remember them being offered in the classified ad sections of many magazines decades ago, and Heathkit offered a notable one.

The whole list loves a happy ending, don't worry!

My congratulations as well. I don't think the PS502 will challenge you too much, if it does (and you may well enjoy it all the more) it means that the problem is more subtle than electrolytic

Hi Ram, In general the readout position influenced by the signal and sweep in 7000 series scopes is well known and due to bad low frequency response (in turn perhaps thermal effects) of the vertical

Hi folks, I was able to find the cause after a very careful inspection of the solder joints around the newly replaced U2521. There was a solder bridge between one pin and the shield trace. Horizontal

Thank you Chuck, when you finish a large step, like CAL01, or CAL02... >>> I had not understand this way from the post I have read. If I recall correctly they said that one should cycle to all the

Congratulations, Jeff! Raymond

Electronic Experimenters Handbook Winter 1974: Build the Bouncing Ball Analog Computer https://miwww.com/eeh/index.html

Hi Jeff, I'm glad you were able to get the 475A working. Just to let you know...When you change the subject line the groups.io system starts a new thread that is separate from your previous postings

...and sorry for another post but I forgot to mention that the AQR function does not work at this point - it always results in an error. I indeed wanted to use AQR to get nice results fro my modded

Let me clarify a couple of points that were probably vague in the original post. The observed problem with the readouts appeared with the 7b92/7a24 plugins and with the 7s11/7t11mod used *separately*

Hi Ram, Just to be sure that it's not related to the 7B92/7854 combination I tried this. Is fine. (There is another issue mentioned in the operators guide.) At 100 kHz I also get several more or less

Yes, thank you David. I did use your excellent instructions to perform the board-level surgery though for the blanking board itself I used a general purpose PCB. However my post is not about the 7T11

This has been done before (by me) <http://perdrix.co.uk/7T11Conversion/index.htm> David

Manahem, As it happens I have chosen to leave the existing carbon comp resistors in place, which replacing the failed transistors and diodes. After replacing the failed transistors and diodes the