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I've seen reference to additional cooling for U800 in several postings. Is there somewhere on the internet that suggests how to go about doing that? Thanks. Steve

Regarding the 40% CH1 and CH2 error, are you using the 50 ohm input or the 1M ohm input? If the former, are you accounting for the voltage drop associated with the low impedance input? I agree that a

I agree with David. Change all the power supply caps. See the condoraudio site. Some capacitors are not doing its job. Power is needed to deflect the beam away from the centre of the screen. As you

Don't mind me butting in, Chris. I would strongly suggest that you finish all your exams first and then come back to spend time on the scope. The scope can wait. To relax your tired mind after

Dave, The pins for custom signal connections could be ignored in an extender cable. Those pins are to allow the user to interconnect the rear in/outs between plugins. For ex, you could take the rear

Gala is correct about WD40 residue. I should have mentioned that I rinse it thoroughly with alcohol in a small rubber syringe or eyedropper to get the oil residue off. HankC

Thanks a bunch Dan. As a kit supplier I needed ti know this, but didn't yet. John

No, these AWG 28 wires are for the (unused) signal connections. The spec is "17 wires of #20 AWG and 34 wires of #28 AWG". I can send you the Tek manual if that is useful. There have been some

Well, of course it's hard to be precise from a photo, but the Tek manual calls out those numbers, and the cable in the photo looks like something close to AWG 20, so I'm pretty sure AWG 20 is what was

Hi Egge, Is it that thin? 34 AWG and 28 AWG? Those are power handling wires for the pass transistors, and 28 seems thin...

Dang! Is it really 20 Gauge? I just found some surplus fire sale 22 AWG ribbon cable for sale...

I'm apparently unable to convey a clear message today lol. Lets try this again - I meant to say all voltages came within 0.3V of their intended values. Cross checking them to the values they should

Oh, yeah the 87v supply comes up to 86.7V I guess I should have been clearer in my prior message when I said that all the voltages came up to within 0.03V of their intended values - that was referring

From your description the 2465 basically works and you have a pretty good idea where to start repairs. I would at least rebuild the power supply and then see how the oscilloscope performs.

Hi John, I removed the back of a T922 and the CRT "key" is straight up as the scope sits in its normal position. There are 14 pins on the CRT like many of the other Tektronix scopes of that era. The

Chris, Measure the 87v supply with those doides unsolsered. THAT will tell us something. Dave Sent from my iPhone

As a quick side note - I powered the scope up with the diode lifted(far side of the diode from U800, easier to desolder and lift), and pin 7 (the 87v input) of U800 shows -3.98V to -4.00V when the

I lifted the diode CR807 feeding the +87v to the U800 IC and when I powered it up it booted up just like with I lifted Q1223 from the regulator board - Looks like it's U800. With U800 the panel

Hi all, I joined this group after buying my second Tek Scope, a 2465, at a very good price because it has begun to deteriorate. So now I am cleaning up my 2465. I am hoping to get clear, clean traces

This subject had come up last year and here is the post I had made back then; I checked an original 067-0645-02 extender cable that I have and here is what I found. The 17 wide 14AWG part of the flex