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1L10 crystal needed (Newbie)
Joel, Did you try Bowmar? (www.bowmarcrystal.com) They claim to do custom crystals for various radios, and have at least one type that covers the 900kHz area. --John Gord
Joel, Did you try Bowmar? (www.bowmarcrystal.com) They claim to do custom crystals for various radios, and have at least one type that covers the 900kHz area. --John Gord
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John Gord
· #179023
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Lot of threads on 24xxB but few on 24xx"A" ...
Chuck, Even on the plain 2465, most of the front panel control is still routed through the CPU. The difference is that the later scopes use incremental rather than absolute encoders on the controls. I
Chuck, Even on the plain 2465, most of the front panel control is still routed through the CPU. The difference is that the later scopes use incremental rather than absolute encoders on the controls. I
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John Gord
· #178582
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214 help needed
Harvey, For power, you might want to consider what I did: I converted the power cord storage compartment (with the little door) into a battery holder for an 18650 LiIon cell, then put a battery protec
Harvey, For power, you might want to consider what I did: I converted the power cord storage compartment (with the little door) into a battery holder for an 18650 LiIon cell, then put a battery protec
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John Gord
· #177143
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Mystery Probe Accessory Grab Bag 'o Fun
Jeff, <A> is probably for the P6201 FET probe. --John Gord
Jeff, <A> is probably for the P6201 FET probe. --John Gord
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John Gord
· #177008
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P6131, T-coils and other probe stuff
Tom, I think the 3 meter version is only rated for 150MHz vs 300MHz for the 1.3 meter version. --John
Tom, I think the 3 meter version is only rated for 150MHz vs 300MHz for the 1.3 meter version. --John
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John Gord
· #176800
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P6131, T-coils and other probe stuff
Tom, I put schematics of the P6131 1.3 meter and 3 meter probes in the photos section, album name "P6131". The full manual is following by snail mail. https://groups.io/g/TekScopes/album?id=259558 --J
Tom, I put schematics of the P6131 1.3 meter and 3 meter probes in the photos section, album name "P6131". The full manual is following by snail mail. https://groups.io/g/TekScopes/album?id=259558 --J
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John Gord
· #176795
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P6131, T-coils and other probe stuff
Tom, I'm happy to send the manual along. I think that the P6131 had some major changes over its production history, particularly a new comp box housing design. They show both box types in the 070-4210
Tom, I'm happy to send the manual along. I think that the P6131 had some major changes over its production history, particularly a new comp box housing design. They show both box types in the 070-4210
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John Gord
· #176734
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P6137 scope probe repair
Tom, How about I mail it to you? I assume the address after your signature will work. --John
Tom, How about I mail it to you? I assume the address after your signature will work. --John
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John Gord
· #176706
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P6137 scope probe repair
Tom, Few of the probe instruction manuals I can still find have schematics. I opened up an early P6106 compensation box, and it has two unshielded inductors (ferrite rod cores?) placed close enough to
Tom, Few of the probe instruction manuals I can still find have schematics. I opened up an early P6106 compensation box, and it has two unshielded inductors (ferrite rod cores?) placed close enough to
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John Gord
· #176705
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P6137 scope probe repair
Tom, The p6131 2m and 1.3m probes used a T-coil in the compensation box. (Schematic in manual 070-4210-01) --John Gord
Tom, The p6131 2m and 1.3m probes used a T-coil in the compensation box. (Schematic in manual 070-4210-01) --John Gord
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John Gord
· #176695
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[dead tek 485] Can i fix it ? (newbie here)
Jeff, According to the 1976 Tek catalog, the recommended probes for 50 ohm mode were P6056 (10x), P6057 (100x), and P6201 (FET). The P6202A (FET) would also be fine. For 1M ohm input, the recommended
Jeff, According to the 1976 Tek catalog, the recommended probes for 50 ohm mode were P6056 (10x), P6057 (100x), and P6201 (FET). The P6202A (FET) would also be fine. For 1M ohm input, the recommended
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By
John Gord
· #176341
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Odd 2247A problem, looking for insight
Walter, I suppose it is possible that U112 has beefy input protection (diode clamps to the supplies?) that might survive enough current to burn a small 62 ohm resistor. At maximum sensitivity the atte
Walter, I suppose it is possible that U112 has beefy input protection (diode clamps to the supplies?) that might survive enough current to burn a small 62 ohm resistor. At maximum sensitivity the atte
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John Gord
· #175878
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Tek Prototype?
Oops, FT-241 --John Gord
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John Gord
· #175346
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Tek Prototype?
The crystal in the unit is an FT-242 "channel" crystal. Those had a strange flex-mode crystal resonator (not the usual shear-mode). I think the 3-digit channel crystals had a fundamental frequency equ
The crystal in the unit is an FT-242 "channel" crystal. Those had a strange flex-mode crystal resonator (not the usual shear-mode). I think the 3-digit channel crystals had a fundamental frequency equ
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John Gord
· #175345
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1S1 sampling bridge GaAs diodes: What alternatives?
Toby, You are right! And they are not in stock. --John Gord
Toby, You are right! And they are not in stock. --John Gord
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By
John Gord
· #174681
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1S1 sampling bridge GaAs diodes: What alternatives?
I think "bulk" here refers to their packaging (they may have a bin full rather than tape-and-reel). They list a single piece price. --John Gord
I think "bulk" here refers to their packaging (they may have a bin full rather than tape-and-reel). They list a single piece price. --John Gord
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John Gord
· #174673
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494AP-How does the Front Panel Amp Cal ie, Blue Shift CAL function work? Mine has a problem
Bruce, The vertical character jitter is probably due to poor thermal balance in the vertical amplifier. Driving the trace far away from center for a long time (as with a horizontal line off the top of
Bruce, The vertical character jitter is probably due to poor thermal balance in the vertical amplifier. Driving the trace far away from center for a long time (as with a horizontal line off the top of
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John Gord
· #174561
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SUCCESS! The "sick" 475A is now the "fixed" 475A!
For relatively slow (Hz to 10s of kHz) square waves of known amplitude, you can use some paralleled beefy CMOS buffers powered by a precision supply feeding a relatively low impedance multi-tap voltag
For relatively slow (Hz to 10s of kHz) square waves of known amplitude, you can use some paralleled beefy CMOS buffers powered by a precision supply feeding a relatively low impedance multi-tap voltag
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John Gord
· #174416
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Calibrating a PG506 w/o Sampling System
Jim, The HP 54120A/54121A combination also gives very good sampling performance, and is sometimes easier to find at a good price. --John Gord
Jim, The HP 54120A/54121A combination also gives very good sampling performance, and is sometimes easier to find at a good price. --John Gord
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By
John Gord
· #174398
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SUCCESS! The "sick" 475A is now the "fixed" 475A!
David, You wrote: " In TEK products high quality resistors do not go high over time!" Well, that may be true, but if so, they did not always use high quality resistors. The focus divider string in man
David, You wrote: " In TEK products high quality resistors do not go high over time!" Well, that may be true, but if so, they did not always use high quality resistors. The focus divider string in man
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By
John Gord
· #174142
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