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Hi Tom - I found the TR502 manual online, info on the crystal in the tek common parts manual (mechanical!), and a catalog page on Bliley crystal website. Whether Bliley wants to grind another? I

I've been working with MEK for years with no apparent health issues. MEK is the solvent of choice for virtually al adhesives except CA and epoxies used in speaker building and repair. I do have

Any clue as to its provenance? Harvey's xmtr shot was the first thing that crossed my mind. One of those little resistors could go before you finished saying 'Oh sh**!' -ls-

I recall my late sister telling me 'everything in moderation'.? She was referring to food, but the same applies to solvents.? If you are involved with the stuff, do so very sparingly and you

I have similar ideas, phase detection, AC and DC voltage measurement, and PNP/NPN transistor lead ID, beta, and leakage to frame.? Going to be more complicated than the existing projects because I

I figured that I would probably elicit an over reactive response from you, Roy. To those not familiar with handling chemicals dangerous to one’s health it is better to be more safe than sorry. If

Dennis, Can't help much on the spectral tube side of things, but I used to work in thick film hybrids many moons ago where we had to occasionally 'de-pot' circuits. One of the few things which will

Hi Jim, Very interesting -- could you post a link to where you found that information? Thanks! -- Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA

I have also thought about a TM500 tester that included: - Presence/absence (but not correctness or ripple) of each of the supply voltages - Brought out all supplies to banana jacks for metering and

MEK is not MEKP... and MEK is not known to be toxic to the liver. Acetone is not as "bad" (whatever that means) as MEK... and acetone is present in the human body, and disposed by it, during normal

Let's see, 62 ohm resistor (that feels like a 1/10 watt just to start), input capacitance of some sort (20 pf, but you'd think that wouldn't be much), feed the scope RF.? 27 Mhz, 20pf gives about 294

Thank you so much Jim, therefore your 52.5 MHz crystal cannot be used to convert the TR503 to TR502. Patience I will try to find a TR502. I thank you for the help you have given me. --Cheers Attilio

I see no significant advantage to a group purchase of the wafer switch for this tester. DigiKey has 100+ available and the discount for a quantity purchase is not that much. Further, it is likely that

My many thanks to Dennis for a job well done. From a PhD in EE, I want to thank you for all the work that you have done. I will think of you and your efforts when I read and enjoy his book!! Marvin

Colin, I don't know a cost yet for the board set and I am not sure I can get an accurate estimate of shipping to the UK. My experience shipping to Europe is that it cost a *lot* more than our domestic

Walter, I suppose it is possible that U112 has beefy input protection (diode clamps to the supplies?) that might survive enough current to burn a small 62 ohm resistor. At maximum sensitivity the

I have a nice looking Tek 2247A scope here that has been sitting on the shelf for a while, due to a bad Channel i input. the signal is a horribly attenuated and differentiated replica of the actual

I put the BD911(NPN) and BD912(PNP) in mine. D44H10 TiP73 (B or C) and D45H10 TIP74 (B or C) should also work OK

Dennis I have some of those laser PSU, 12V input I think. Please PM if you want more info, photos etc. Jon