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Jeff, Trimmer caps often have 3 pins for mechanical stability. Two pins are usually connected to the stator blades. Sometimes you see them commoned on the pcb traces, sometimes not.

It looks like Avnet still has some stock: https://www.avnet.com/shop/emea/products/vishay/mbr40h45ct-e3-45-3074457345634925502/

It looks like you could substitute an MBR40H50CT or MBR40H60CT, if you can find them (higher peak and working reverse voltage specs, 50 V and 60 V respectively). I see the MBR40H50CT-E3 for sale on

Hi, I wish I had found this post earlier, I have the same problem on a 2465 with A9-Q1981 getting extremely hot and no display. Disconnected pin 7 of U1830 and the -15v returned, was at 9v and no

Hi, Did you solve your no display problem? I have the exact same problem with my 2465, in that removing the red wire pin 7 to U1830 Q1981 no longer gets extremely hot and the -15v returns. Did

Trying to find a current replacement for this, has any got a suggestion? Found reference to MBR40H45CT-E3/45 but this is no longer available.

Mark, Thanks for the support, I will probably need it. I have taken some measurements of the front panel controls (AMPLITUDE and OFFSET pots) and the AMPLITUDE pot is all over the place, not linear

I don’t think so, it’s the original one. But I did, at some point, change it for the 3 other modern ones I have, and they were performing perfectly…. When the unit “was” working…

Unless I was distracted, I’ve always followed the setups in the manual as far as measurements. A TO-3 will barely even fit in there…. Is that what you used? Maybe a TO-220, I don’t know. So

could Q257 have either too high a beta or too high a frequency response? Harvey

Hello, I do have an original front cover for scope models 465/475 in perfect condition, and would like to swap it by one for model 485. I can send pictures upon request. Note: I am not interested

Stephen, It's not just that control setting but its effect upon the three main power supplies that is what is so remarkable and is why I had emphasized following the set up in the manual for

Did I mention that the maximum amplitude on the full blast Hi-Amplitude setting, is only around 50mv? I’m wondering what gave this time… This is definitely THE most frustrating piece of equipment

David, The TO-220 you mentioned are indeed more robust. But due to a significant difference in the form factor, I can only assume that mounting them correctly may not be that easy or pretty, but

Well…. It seems I spoke too soon. While checking the calibration, the unit started to fail again. But this time R233 and D233 are fine. At first, the negative part of the square wave started

I think service manual hints to pushing the knob to see the set screws too. I bought some 3D printed ones and their finish was too rough. I ended up not using them. I don't know if it is the same

Hi Ozan, I was able to remove the time base knob and there were two screws hidden by the moving plastic part mounted on springs: you need to gently push and then you can access the two screws. It

Hi Christophe, My comments are below. Great news, looks like you are close to fixing the scope for good.

[email protected]> wrote: I've never been into a 2465 SEC/DIV switch, but there will be some kind of interlock between the A/B switches, and presumably the knobs need to be timed right for this to

Jeff, Yes, the four C numbers are the ones I meant. Being across such a low resistance, I would reject anything over 3,3 ohms which is 10% the resistance. Having high ESR could make the output