There are two 7A18s in differing condition, pics here:: https://ozindfw.net/7A18a/ $10 https://ozindfw.net/7A18b/ $15 The 7B53A is really rough, $5 and pics are here:

Starting a new thread on this here. Yes, it is insidious. I’m not sure why, except that the excellence of the ‘scopes is attractive, and after the first repair of one of these using the Tektronix

I believe that you would be better off changing to a modern and higher voltage rated tantalum cap rather than substituting in a potentially inferior performing aluminum electrolytic cap. This will

DaveD, that is so true! I'm entertaining myself watching another item by the same seller that is about to expire. It pushes a lot of "want" buttons, but for the cost I can easily buy several items

Mark, that is excellent advice. Unfortunately, it doesn’t work when it comes to Tektronix oscilloscopes. DaveD

Jeff, You want the scope, not need it. That is enough to hold onto the money. I have done this and was glad I did. I soon needed the money for something that was a necessity/emergency. Had I spent

Gentlemen, I while back I informed here that I'm trying to revive a TDS3012; essentially that was done with good results. That scope came to me with Rack Mount RM3000 (includes all the hardware to

My first two ‘scopes in my home lab (many years ago) were a 7904A and a 485. I chose these because those were the two ‘scopes that I had in my lab at StorageTek (back in the 80s). The 485 served

You're right, Jeff. The 485 has an extremely nice and clever arrangement to protect the 50 Ohm input, without fuses. Raymond

Gary, Had you tried cleaning the leaf contacts in the attenuators? I've had that same problem on every 475 I've ever worked on, as well as on a number of 7k plug-ins, and cleaning the leaf contacts

Bob, I appreciate the perspective. I know that people love their 485s, and I presume there are good reasons. It really was the best of the line for at least a decade. I'm not sure that I need it for

I don’t fully agree with that recommendation, although it is fine in many circumstances. The impedance of tants stays low at high freqs, while aluminums generally don’t. Tripling the capacitance

1) I understand that I should start with checking the +50V (UNREG) and then 50V (REG)\, next the+ 110V, +15V, and then +5V, -8V and finally -15V. Is this correct?. 4) I understand that TEK used a

My own thoughts - for what they are worth. I have owned two 485's, and they both displayed issues with intermittent attenuators. I would wiggle the knob and try to get a stable trace, but often the

That's a very generous offer and one that we should all keep in mind. I will add, however, that even a new pot may fail in this same way. My guess, and it's only a guess, is that the Tek assembly

Jeff, The 485 is the finest portable Tek made in its day. I paid $350 for mine about 15 years ago and I'd gladly do it again if I had to, but obviously would rather pay less. That 350MHz BW

Barry, If it's that way with several plugins, it might be in hte receiving side of that interface in the 7704A. Stephen

What a fantastic translation. Ramp generator into "catastrophe" generator into "disaster". Google translate without context. I love it!

Hi All, A few years back, (not Tek equipment) I won a beautiful, museum quality cosmetics, Bang & Olufson linear tracking turntable, 1980’s Made in Europe, heavy, IIRC around $225. and the weight

'Disastergenerator' ? I have some of those lying around here !! <grin> Wasn't this setup a replacement for the 160 generators when Tek were getting into Biophysical market.? I understood they rather