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Here is an update showing the list of those I have on record who commit to reimbursing for the cost of board sets for Jared Cabot's TM500 tester, as of this afternoon. Please check the below list to

Hi Jim, Thanks a million! I hadn't thought to look in the mechanical catalog, nor would I ever have. I'm grateful for your superior search-fu! I'm scratching my head about the SC-cut bit, so your

The flash-point of acetone is, or about, 0' F. MEK is, or about, 20' F. The flash point is a crude indication of how "easily" something can catch fire, if there is a suitable ignition source. MEK is

1/2 watt transmitter power at the right frequency gives you 1/4 watt per resistor.? If there were any snubbing diodes in the amplifier, then frequency becomes less important. Then there's likely no

some more data on this odd fault: 1. the resistor is 1/4w, fairly big to burn up. 2. when set to DC coupling, both inputs measure almost exactly 1Mohm with my 34401A. 3. vertical cal is good on the

As one of my profs used to say... erring on the side of caution, isn't about erring at all... it's about accessing risk, when there is a lack of scientific data. There are a lot of studies on the

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