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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 :).

Hi Ozan, Unfortunately do not have any working scope however the readings are as follows. The voltage across C1723 is 57 volts Across C1722 is 106v And across

Hi Roger. As for the resistors, R1735 measures 57.7k with a leg lifted whilst R1737 comes up as 8.8k. The U1724 Op amp is a bit of a puzzle right now. I may well just rig up an op-amp tester on a

Thanks much for the tip, Bob! Neil

The BU208A is *>not<* a good idea. With a full set of modules the current load pushes past the SOA at the duty cycle used by the power supply. Its gets way too hot.. And once it gets hot it derates

On Sun, Jun 30, 2013 at 02:10 PM, G?ran Krusell <goran.krusell@...> wrote: The BU208A is *>not<* a good idea. With a full set of modules the current load pushes past the SOA at the duty

Brad, Not sure what a cup of coffee costs these days but I'd be interested. Joe

We scan our website daily and yesterday we were notified that we had some redirect issues which were corrected reasonably quick. All should be good. - Dave