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Deon, I’m interested in your T801 recipe. How did you rewind it? I’d like to compare to my 453 rewind which I published here. Dave Wise

Generally, paper vendors ... like for copiers, or laser printers... won't tell you what is in their paper, or what is on the surface of their paper. At least, they won't tell me. AFAIK... and at

Mark, I think these are late enough to have FET's instead of Nuvistors. Are your part designations particular to a specific model? It looks like the 453 MOD 703K and 7034H borrowed parts

With too much ripple, I can see the reset circuit tripping especially if the power drops below the reset threshold.? I think there's likely a "needs to be good for this amount of time" function

Ray, Check the tunnel diode circuit to see if it is working right. There are internal adjustments that may need to be adjusted. This circuit is sensitive to get adjusted. In mine, I replaced a number

Getting the PSU out of a 2247A was a dream compared to removing the front panel PCB from a 2232! I had to replace the 'Trigger A' potentiometer on my 2232 because the shaft had cracked. Getting the

Jay, Recapping is best. Nichicon ULD, UCY, LGR and UHE are good choices. I suggest mounting them so that there is a gap between the bottom of the caps and the board to allow for air flow under them

Hi Mark & Deon: Just an update on what I’ve tried so far. My next step will be to borrow a friend’s VTVM so that I can make some voltage measurements around the HV circuit (especially the

I think I see what's going on with the scope. On the 'measurement processor' circuitry (A16 processor PCB) , there's a power-on reset circuit that monitors the 5V rail and sends a reset to a few of

I think the best hope for this scope is to see if there is a way to get it back to how it was before the firmware update. I have no idea if this is possible, but this scope was useable before the

have a trio of Tek 453's. Two are MOD 703K and the other is MOD 703H. I have had one of the 703K's on my bench for many years. Of late, it has developed trigger issues. I can only get a stable

Generally, another ground with intentions of stability.? When replacing with a two lead capacitor, make sure that both grounds are shorted together.? Tek often used the two leads as a ground

The cardstock that I use is Vellum Bristol. Neenah Exact Vellum Bristol, specifically, and I picked up a bundle of it at Sam’s club a few years ago. Most office supply stores will probably have

I got to sit down with my 2247A this afternoon and have come to the conclusion that above all else, the power supply needs some attention. All of the LV supply rails, with the +7.5V rail being the

no personal connection https://sacramento.craigslist.org/ele/d/sacramento-tektronix-2445b-oscilloscope/7843398888.html

If I remember it properly, the SC504 has a very odd switching mechanism, not really fingers but a conductive elastomer.? The scope was originally spec'd to go to 100 MHz, but the contacts limited the

Hi Gordon, Going back to the unblanking circuit again, diode D831 was added at a later date and may not actually be in your 547. This protects the circuit from damage due to arcing discharge, in

I don't remember which plug-in(s) was (were) cited, or what the reason was, but I do remember being surprised. I need to write this stuff down when see it. The comnent that I read was probably on

Thankfully, cleaning seemed to have done the trick in my case. No more flashing 000's and the switch works in all positions.

Your problem might not be dirty contacts. I recently found that my cam barrel had deteriorated and actually had shrunk. The end of the can barrel serves as a bushing that fits into the mounting