http://sfbay.craigslist.org/sby/ele/3758624531.html Isn't this a 577 with adapter? Bob

Back on the 485 after fixing some promised PC/LCDs ( yup, bad ecaps) Intensity adjustment measured at test point 1781, Z out, now works! After reading the discussion about transistors that can check O

Fred, Thanks for the notes and your website. Ecaps drive me crazy sometimes, this may help restore some sanity. Bob Analog SEEKrets DC to daylight ( http://www.logbook.freeserve.co.uk/seekrets/ ) to m

Which Glyptol? The internet showed several kinds. Thanks, Bob

What brand/kind of liquid flux would you recommend? Bob

Yup, My 24 inch LCD PC monitor and my wife's 22 inch (she uses it a lot less often), my wife's PC, my daughter's pc etc., and many more all came free to me (mid to upper pentium 4s, some dual core). F

Wouldn't there still be a problem if the internal windings have already shorted? Bob

So now the question is: Who has more scopes etc? - Craig or the Tek museum? Bob

Mine downloads and opens just fine. Win 7 IE9. Bob

So would 3-4V AC work for the EB junction in Transistors with low VEBO? For others I guess I would need to look at the spec for each transistor type tested. Bob

So how do you test transistors safely? I would like to use my 12V AC diode test setup but looking at a transistor spec this doesn't seem safe. For example the 2N3906 shows 5V VEBO. Bob wrote: guess I

Fred, Thanks, this is the kind of information that is helpful. I am trying to learn how to better deal with marginal problems. Generally easy to find a completely broken part. Not so easy with margina

Had this thought reading Craig Sawyers 7844 repair work: Recently working on a 485, I used a simple diode curve trace set up. One of the diodes clearly showed bad, probably leaky. Initially that diode

How's this? http://www.totalvac.com/23-4900-04.html?zmam=6843742&zmas=1&zmac=18&zmap=23-4900-04 Vacuum mini attachment kit Bob

This diode tracer is what I used to help find a bad diode in my 485 (photo folder 485 no trace). Bob

I pushed it out the back. I remember I also used a very small hammer, sometimes called a 'tap' hammer and lightly tapped on the needle nose while it gripped the hook. Note: the part of the hook that i

It may be possible to repair this. I have a spring hook tip that has the flat type of hook that had a similar problem. I used a needle nose pliers to push the hook tip out. I found the inside end is k

David Based on your comments, I swapped in a good U1624 from the working scope. HV is now about 3012 varying by a couple of volts. Pin 2,3 went to -65 and -66 mv. Looks like I need a new U1624. Thanks

David; U1624: (measured with a Fluke 8800A) Pin Bad Scope Good Scope 2 -8.5mv -62.6 3 -9.8mv -63.0 4 -15.0V -15.0V 6 +690mv +706mv 7 +14.95 +14.93 It looks like pins 2,3 are not negative enough. What

Thanks, I will check. Bob