I can confirm that the tube is a direct transplant however I do not know about the HV board. I used a 5110 to replace in the tube in one of my 577's no modification needed. Zen

Mark, No need to apologize! I have benefitted from your advice here many times and would not think you're trying to mislead anyone. I'm sure I could have given more information that would have

Cleaning the contamination everywhere, and replacing the pots in the 577 HV driver did not fix the display, so I managed to get a rackmount 5110 at auction. It has a crisp stable display. Looking

Barry, I apologize for the mistake I made in the diagnostics. I went by the initial statement and previous problems I had. Albert is is right about asking about TP725. Thank you Albert about

Hi Barry, Yes, this activates the trigger lights, but just to be sure I asked you about TP275. So TD CR262 is no longer suspect. The reason for TD CR299 not firing can also be that Lockout is active

Albert, I'll have to check but I think I recall that TP275 is correct - or, at least, shows a waveform similar to what's shown on the schematic. I presume that's what's allowing the TRIG'D lamp to

Folks, Risetime and bandwidth are related by a simple relation: BW= 0.35/ risetime. For a 350 MHz bandwidth, the risetime needs to be 1nS. For a 60 MHz bandwidth, you should expect a 5.83 nS

By the way, I've been assuming that you're properly terminating both pulsers. Improper terminations can make a big difference. (I didn't pay close attention to the thread, so sorry if this was already

Barry, the collector of Q266 should show just a weak signal because Q273 is driven common base. What is TP275 showing? Albert

Hi Jared, The pulsers have rise times that are much, much faster than your scope's, so any differences between the pulsers can't be seen by your scope (which is why one needs a fast scope to resolve

Mark, That's what I was suspecting as well. The block diagram page includes those diodes specifically in the TRIGGER PULSE GENERATOR and SWEEP GATE MULTIVIBRATOR blocks as does the circuit

Barry, I strongly suspect CR262 and CR299 are bad by your description. I have a 454 that had the same type of problem you have. I had to replace the four tunnel diodes for it to work because the 454

This could also be caused by the steepness of the rise time. Taking in to account that the screen shot is on a 60 Mhz scope. This is way to slow for rise time measurement of either pulser. However

I'm attempting to resuscitate a 7B50 but, so far, have not been able to determine why there's no sweep. It's triggering (the lamp comes on appropriately depending on the LEVEL/SLOPE setting) and I

All 3 pulsers at Bodnars website (at this moment) have 1.2 V pp max. So which model are you referring to? Attenuators will degrade the pulse form somewhat but perhaps you can try attenuators to test

Yeah, I was referring to the slew rate of the pulsers, not the oscilloscope. As the pulsers have different peak voltages and rise times, that could be causing the discrepancy as I firmly hit the

Zenwizard posted some useful videos on his channel - https://youtu.be/17RdvBrdVeY

Jeff, Back in the 1980s, I designed a 6809B based CPU on an S100 Bus platform but never finished building the computer as it became cheaper and easier to buy a Radio Shack CoCo 2 and later an IBM

It's complicated.. I have 1 of the proper P6460 probes with a zillion leads and at least 4 P6461 (maybe as many as 8?) probes with flex circuit leads that came with the 1240 when I bought it. I think

SOLD! THE MANUAL HAS BEEN SPOKEN FOR! Thank you all for your interest! -- William, k6whp "A friend told me to cheer up, things could be worse. So I cheered up and, sure enough, things got