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7A16A high frequency compensation.
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
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
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Raymond Domp Frank
· #193323
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7A16A high frequency compensation.
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
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
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Raymond Domp Frank
· #193317
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7A16A high frequency compensation.
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
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
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Raymond Domp Frank
· #193292
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7A16A high frequency compensation.
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
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
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Raymond Domp Frank
· #193246
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7A16A high frequency compensation.
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
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
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Raymond Domp Frank
· #193236
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Analog storage scope howto
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
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
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Raymond Domp Frank
· #193222
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Analog storage scope howto
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
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
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Raymond Domp Frank
· #193216
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Analog storage scope howto
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
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
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Raymond Domp Frank
· #193215
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OT+DC was Re: [TekScopes] 2465 Calibration
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
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
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Raymond Domp Frank
· #192934
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2465 Calibration
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
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
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Raymond Domp Frank
· #192926
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2465 Calibration
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
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
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Raymond Domp Frank
· #192922
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2465 blower
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
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
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Raymond Domp Frank
· #192870
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not a tek but philips
Free, very good scan: http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Philips/pm3262.pdf Raymond
Free, very good scan: http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Philips/pm3262.pdf Raymond
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Raymond Domp Frank
· #192686
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Old ic’s
Sorry, that'd be MMI's 6330/31 256 x 4 bit fusible link PROM (8 address bits, 4 data bits). Raymond
Sorry, that'd be MMI's 6330/31 256 x 4 bit fusible link PROM (8 address bits, 4 data bits). Raymond
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Raymond Domp Frank
· #192563
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Old ic’s
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
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
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Raymond Domp Frank
· #192562
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(7854) A Drop-In Replacement for the MCM68766 EPROM
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
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
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Raymond Domp Frank
· #192459
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(7854) A Drop-In Replacement for the MCM68766 EPROM
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
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
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Raymond Domp Frank
· #192455
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(7854) A Drop-In Replacement for the MCM68766 EPROM
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
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
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Raymond Domp Frank
· #192452
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OT: Seeking help reviving a Stanford Research Systems SR760 Spectrum analyzer
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
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
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Raymond Domp Frank
· #192402
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Card Edge Connectors on a 7704
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
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
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Raymond Domp Frank
· #192372
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