There's definitely a reflection there. AFAIR, the OP mentioned that suddenly, things went wrong after being OK before, so I assumed what Ozan mentions: was already in the setup. Come to think of it, I

Hi Max, Currently, I'm not where I have my equipment, doc and parts so I'll do without: I'm pretty sure that Q150 is an often-used FET (151-1032-00?), so it would be easy to replace. I'm almost certai

Could be. OTOH, remember that the gates of these FETs are Hi-R only as long as their Gate-to-D/S junctions are reverse-biased. As an example, a shorted C158 (dipped tantalum?) would thoroughly disturb

In my schematics, no R133 is present, so I can't be specific. Adding a low-value resistor if necessary, else leave open, which is the implication of what you write, seems strange to me, unless it's ac

If you didn't already, I'd check, resistors, especially the low-ohm carbon composite ones. They tend to drift up, sometimes in jumps. You can measure in-circuit, where necessary by comparing with what

The "STORAGE" section in the operators manual (starting at page 1-20) tells you what the modes and controls are (named), what they do and how to operate them. It doesn't tell you what you'd use a stor

Andy, Congratulations on your new 7633. In its time, it was Tek's most powerful 100MHz analog storage mainframe. It is capable of all useful and not-so-useful storage modes that analog 'scopes provide

Tek's Concept Series are a good way to go. Since you've got a 7633, use its Operator's Manual, which is available for free online. It contains some pretty good introductory information on what you're

On Sat, Apr 30, 2022 at 09:33 PM, si_emi_01 wrote: Since this seems very important to you, I'll respond, embedded, after your text > > It all comes down to resolution of time and level. > > I have nev

Taking our banter still one step further: Of course, I agree with that. The "DC level Output" used while adjusting the 'scope in this case is supposed to have a fixed potential, lest it would make its

In a cocky mood I'd say a DC level is not a signal; it contains no information. Switching a DC level on or off however is. Raymond

Never seen that happen and I'd be surprised if that'd ever be the case. In all cases that I encountered, wear of the shaft inside the sintered bronze bushing caused the wobble. Most of the time, the h

Free, very good scan: http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Philips/pm3262.pdf Raymond

Sorry, that'd be MMI's 6330/31 256 x 4 bit fusible link PROM (8 address bits, 4 data bits). Raymond

The device ID in DEC's handbook is a 74LS367, not '387. Difficult to read in the scan though. It matches the '367's function and pinout. The '387 could be something like MMI's 6300/01 1K x 1 bit fusib

Hi RAM, I realize that I didn't even mention your solution/device, which I think is very elegant. Programming the device may be a complication for some though. Can a simple device like the popular TLS

Physical space is the problem here, not electrical specs; the four 24-pin ROMs are mounted end-to-end lengthwise with only 0.2" in between, which doesn't allow for the longer 28-pin 2764's. on standar

A few years ago, our member Holger Lübben designed a replacement ROM card using commonly available components. He had complete sets and kits available. See this thread: https://groups.io/g/TekScopes/t

Hi Jon, I just sent you my PM reply. Your gesture does deserve mention on the forum though. Your gesture of making copies of the instrument's ROM images and sending them to me is very much appreciated

You have to realize that virtually all contact pressure in those connectors comes from the plastic covers; unsolder the connector, remove the cover and all contacts will land on the floor... Raymond