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It looks like the required RF power levels aren't out of reach for JFET substitution of the 7587 tubes. The tricky ones will be the 500 MHz multiplier and the 100 MHz driver for the 200 MHz diode

My 7854 was working last I checked. Probably still is even though I may not be getting back to using it for a couple more months... Is there a quick indication of which version they have? I could warm

Hello all (and Ha Happy New Year) I am looking for the images of the version -02 of the 7854 scope. All I could find are either the -00 or the old ones from Pentti. Anybody have them? I was able to

Dunno if it'll be helpful or not but I'd had good results with LND150 depletion mode mosfets in various lower frequency tube circuits. They act a lot like a pentode in-circuit, with no screen

Good Day, and a Happy New Year to everybody. from a front end print .svg.? I could not agree more. I am very satisfied with the Front Panel Designer from?http://www.schaeffer-ag.de

Ed - thanks. Both great points - mismatch problems and damage that may not be seen with a simple test procedure resulting in a repeat repair procedure anyway. I do have two new TIP 41Cs so I will

Ha! Good one Jerry. I have also seen those resistors go bad . Just like you say, they had cracks in them. Maybe use a ww 2 watt to replace it? Tom

Hi, I had a 7704A power supply that would lose -15V after it had been running awhile. It might be after minutes or a few hours but it would fail and the screen go blank. I could never find anything

Been a few months since you posted this but thanks to another group member who loaned me his copy to scan over Xmas we now have the Service manual for the 2221A available Contact me off list

Good question. One I don't know, but it's worth a shot. I'll see if I can find a really strong magnet in my box o' stuff and see if I can pull that strap over. Mark

So I thought I would share with the group the techniques I ended up using to calibrate at least the AC voltage side of the 2465BDM's DMM option. For the 190v and 500v 60 Hz I used a 460v to 24v

Is the strap possibly magnetic? A magnet may be able to bring it within arcing range. 73 Glenn WB4UIV

Hi Stefan, You are correct - the P5100 probe tip is 7.5 mm, not 5 mm. There are two reasons. First, we had to use that size because Tek requires all products to meet UL1244 certification. The creepage

Hi, Can some one help me please...? I am looking for detail on diodes for a Sony/Tektronix 314 oscilloscope power supply board, Diode on power supply board is CR675A, CR675C, CR678A burnt and i nead

Interesting. How much of a gap did you have between the pin and the strap? Noticed your email handle. Are you located in Baltimore, MD? Mark

In reply to the questions on the picture, "this" is most definitely supposed to connect with "this." ;-) That's kinda what I figgered. Hence, my search in the darkness for an honest CRT. ;-) Mark

Unforch, I don't have a HV spark generator. Though I could think of a few nefarious uses I could put it too... ;-) Mark

Yeah. I'm scratching my head trying to figure how that could happen without seeing any other damage to the tube. The rest of the jug is pristine. Mark

Thanks! Nice, clean layouts on those panels. Mark

Change the 125 volt plate supply on the switch to 12 volts. Leave the screen open, it's not needed. Just put a pair of RF N-Ch e-mode fets to the plate, grid, and cathode and tune away. Pick a fet