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I noticed on the TekWiki page for the 7B80 that the 7B50A uses the same custom trigger chip. I then looked at the schematic for the 7B50A and it appears the trigger board is identical to the one used

You may be able to select a TO-220 part. The TO-220 package was designed to match the lead and mount-point spacings of TO-66. Dave Wise Sent: Sunday, March 13, 2022 3:46 PM To:

This says what you think as center point is actually one of the ends. Point marked as [9] is center tap and should go to mid point of C1722/C1723. Two ends are [7] and [3]. Measurements should be [9]

What AC voltage do you measure at the two transformer taps of CR1721? One lead of the voltmeter is at center tap, and two measurements to each side of the secondary. No need to disconnect

Hi Ozan, actually you might have made a good point, as the scope has been connected through a dimbulb tester due to R1726 starting to smoke whilst connected directly on to the mains, which measures

----- There is also another adjustment LO/MED/HI. Which setting is used and what voltage do you (carefully) measure at your power outlet with a high quality AC voltmeter? What AC voltage do you

Unfortunately not. You did get me to check though... :) James

Is there any possibility your scope is setup for 220V operation and you are in a 120V zone? Ozan

Hi Mark, I'm reasonably sure the rails are good and the pots are clean and LEVEL pot is relatively smooth. I'm not sure the voltages are what they're supposed to be at the top and bottom ends of R58

@ Jim Adney For PS filter caps, the AC ripple should almost always be less than 1 V. If you see less than 1 V you're probably OK. If you see 5V or 25 V or more you can probably assume you've

Unlike the 60's 5xx series mil plugins, which had bail latches instead of thumb screws for locking the units in place, the 7k mil plugins are identical (at least physically) to the normal versions.?

I’ll go through the calibration procedure again shortly, and check that, and if, everything is in order. Will report back

On Sun, Mar 13, 2022 at 08:33 PM, P F wrote: Interleaved > > I think one of the subsequent modifications that Tek put out, which was the > replacement of Q247, a 2N3739, to a more robust 2N4240

Albert, you’re absolutely right. But my unit is serial number 1467…. Exactly within that range. Although it seems to have already mods from the the cumulative file on TekWiki. I haven’t checked

Morris Bog std 7K plugin -mechanically- as far as I know- Will take a few pix and get back to you directly. Nothing much left in them so quite light! DaveB, NZ

You might want to check C1722 for low capacity or high ESR. If you feed the regulator a voltage of 57 volts bulk where it expects 83 volts to put out 65, then the regulator simply can't deliver, and

This is the issue. This voltage definitely needs to be more than 65V and 80+V according to the schematic. Most likely C1723 is bad or the bridge CR1721 lost one of its diodes. Ozan

My comments are based on 2467B but I think 2465 is similar enough. You will My 2467 had contact issues everywhere, presumably because it had been stored in poor conditions before it cam

While another scope will always give you the best answer, you can often get a very quick and useful answer by just switching your DVM from DC to AC. That lets you read the DC part as well as the AC

Ah, good catch. I did skim the schematic searching for a switch, but it didn't quite jump out at me :).