Okay, but I did not think the posts about the Tek 475 had anything to do with Bob's computer, so I would have never guessed this.

The Tek 475 is analog, with a CRT screen, so the tools for LCD screens will probably not work. The intensity knob may be turned down too low (as Bob mentions), but on my 475, if I turn down the intens

The p-p voltage is around 0.4 mV, not 2.5 mV. I forgot to correct for the cascade amplification in the 475. This amplitude makes much more sense to me. I can see the 1 KHz signal on the 453 as well, i

Hello Fabio, Regarding the calibrator probes on the 475 and 453 -- I am aware of the difference you state below. But given that the 453's loop is meant just for current, I still curious to see some vo

Hello Fabio, Thanks for the response! It's clear now that I need to be more clear in my messages. Despite contrary evidence, I know what a current probe is, and I have a bigger clamp-type one for deal

Hello Fabio, The 1 volt output is at the BNC (J579), so the 200 ohms are not included and I get 1 volt peak-to peak here at the 1 volt setting, and 0.1 at the 0.1 setting (with another 180 ohms). The

One last comment, and I'll leave the rest of the message in for context. When I stated "Why would either BA or BB be a dead short (at ground) to Q1274's emitter? "I meant why would someone think that

Why would either BA or BB be a dead short (at ground) to Q1274's emitter? There is a 2.19K resister between the emitter and either BB or BA. I guess what I'm missing is how someone could see a short o

The signal is not shorted to ground -- it goes through a 2.19K resistor in series first, so there is no short. My Tek 453 has a calibrator signal, at specification. My ohmeter and voltmeter check meas

Given that ethanol has some energy content (about 67% of gasoline on a BTU basis), a 10% decrease in MPG with 10% ethanol is an unexpected effect for ethanol alone. Studies at Oak Ridge National Lab (

To check the schematic, I opened up my 453 (>20000). There is no error here; BB is a ground point, and the emitter of Q1274 goes to it via R1274 in series. Even if the line denoting the edge of the bo

Thanks for the chemistry and especially the history. What I meant was "could there be methanol in gasoline, instead of ethanol". Rolynn Prechtl's post mentioned methanol. I had only heard of ethanol i

Sometimes, premium gas will not have ethanol (is there methanol too?) in it, and the gas station will have a sticker or sign about it. That's what I use in my saw and snowblower, and have not had a pr

Although lop pol fixed it by now, I wonder about something: the schematic shows a DC voltage drop between the Q1274 emitter (5.9) and after R1274 (0.5 DC). With R1275 lifted, there is still a return t

Are you getting the correct voltage into the base of Q1274? The signal output at Q1274's collector should be about 12 volts, so your circuit is cutting it in half. Try lifting (disconnect) R1275, to i

Hello Jerry, Tucker Electronics has 9 of them, at $7.95 each. http://www.etestparts.com/Search.aspx?Search=152-0321-00 wrote:

Regarding the preservation of a 50 + year old scope --- I ordered original replacements -- cost me $1 plus shipping. I appreciate quality and history, and working on the 453 has been a wonderful windo

Thanks, Tom, David, Dale, and Joe for all of the great advice. Knowing the difference between matching and selected helps a lot -- I thought I might have had to get a bunch to match them, and that's w

Hello, On a Tektronix 453, serial # > 20,000: While carefully pulling the leads away to pull the B-Sweep board (where I have a known problem), I still broke one of the legs on Q894 , and the lead is n

Hi Rich, sorry, I made a mistake --- both ends are serial (9-pin female, 25-pin male). The cable has 10 wires: 18 AWG black, 22 AWG black, gray, white, yellow, orange, red, violet, blue, and green. Th