Re: Yet another 465B restoration question
You can try Artekmanuals.com! They have an extensive library of Tektronix manuals https://artekmanuals.com/manuals/tektronix-manuals/
They are reasonably priced and they get them to you usually
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Frank Mashockie
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#203542
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Re: Removal of Pull-tabs on older TM500 series plug-ins
From what I've seen of the older tabs, you need to press out the pin in the tab.? That should allow the forks in the shaft to the tab to be compressed, or at least moved.? I'd suggest moving the tab
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Harvey White
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#203541
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Removal of Pull-tabs on older TM500 series plug-ins
Hi, I was wondering how to remove the older style pull-tabs on the TM500 series plug-ins. These use just a piece of plastic bending, unlike 7000 series plug-ins. Hopefully, they can be removed in a
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Benjamin Badrakh
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#203540
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Re: Yet another 465B restoration question
Thank you.
I have a copy of the troubleshooting guide and went through it partially before switching to the ¡®failed¡¯ assessment of the power supplies (see oopsy). I need to finish reading it.
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Don - AC2EV <dkiser100@...>
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#203539
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Re: Tek 2236 scope repair
I don't know how you're probing those nodes, but I suspect the ringing you see is measuring error. It is tricky to get good CMRR in those kind of measurements. Try looking at one of the low voltage
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Ed Breya
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#203538
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Re: FS: Tek 453, and a few other items, near Madison, WI, USA
my apologies; you are correct.
Mike Dinolfo
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Mike Dinolfo
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#203537
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Re: Tek 2236 scope repair
It appears that there is saturation and ringing on my transistors.
https://ibb.co/sKgnCct
Here is a plot of the base and emitter of my transistors. The yellow trace is the current through the emitter
By
Board
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#203536
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Re: FS: Tek 453, and a few other items, near Madison, WI, USA
I could be interesting in doing a pickup if there is enough to make the trip worth it. The lab is reasonably close to Madison WI
Zen
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Eric
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#203535
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Re: FS: Tek 453, and a few other items, near Madison, WI, USA
The subject line of this thread says "near Madison, WI, USA."
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
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Dale H. Cook
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#203534
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Re: Tektronix TDS3034B Boot Challenge - Help Needed
Dave,
Thanks for your feedback! I just received input from sicco on the eevBlog forum that what I am seeing is correct as the CLKOUT never changes from the 25mhz and the 50mhz speed-up only applies
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Mike
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#203533
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Re: Tektronix 7904 rear AC mains range selector switch missing
Actually, it looks like my question is invalid as the 7904 appears to not use such a Hi-Med-Lo switch.
This makes sense though as the 7904 uses a switching power supply.
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Benjamin Badrakh
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#203532
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Re: FS: Tek 453, and a few other items, near Madison, WI, USA
Jim:
I might be interested in the 453; but can you first clarify what "your area" is, geographically?
Mike N4MWP
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Mike Dinolfo
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#203531
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Re: Dennis Tillman - Update
Thanks for the detailed update and I'm so happy to hear good news. So many times, these kind of situations go the other way.
Cheers,
Tom
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Tom Phillips
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#203530
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Re: Yet another 465B restoration question
Hey Don,
Great first post, I'm sure you'll get the old girl up to snuff in no time.
Oscilloscopes are kind of unique in that it's often possible to diagnose
problems to a functional block by
By
Sigur?ur ?sgeirsson
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#203529
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Re: Yet another 465B restoration question
@Don,
Fair enough. I am probably in the minority here when it comes to cap replacement. It doesn't make for a good preventative maintenance practice IMO. Because you really don't know how long
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Frank Mashockie
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#203528
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Re: Dennis Tillman - Update
As am I!
larry
By
Lawrance A. Schneider
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#203527
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Re: Yet another 465B restoration question
Since most of the replies are pointing to bad capacitors, I'll go back and double check the ripple, just to be sure. I didn't see in my notes where I recorded it, so I will do that.
Given that the
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Don - AC2EV <dkiser100@...>
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#203526
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Re: Yet another 465B restoration question
Ripple is within spec.
Why did I replace the capacitors?
1. It's relatively simple and cheap to replace them
2. I've had capacitor issues in other equipment. The biggest offender being the Rifa caps
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Don - AC2EV <dkiser100@...>
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#203525
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Re: Tektronix TDS3034B Boot Challenge - Help Needed
To Guy's point, a relatively simple test if you're set up for it would be
to dump the flash a few times over the course of the warmup time and see if
it always reads correctly.
I can take a look at
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Dave Casey
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#203524
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Re: Method to measure HV
I finally thought to look and that "odd" resistor is a 1090M-ohm that's meant for an RCA WG-289 probe. I haven't done anything to check the resistance as nothing I have can do that. I might connect
By
n4buq
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#203523
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