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Hi Adri, sorry for not giving feedback earlier, I've been very busy this week, and the days have been very long. For band 0, if you have a signal at A3A3 output, but nothing at A3A6 output at

Replaced Q9, powered on and blew the fuse. Replaced Fuse + Q9 again + pass transistor and no fuse pop. Not sure if better, worse or just different :-) Q9.. C = 22v B = 54v?! (was 23.5v) E =

Bill, OK it seems that Q 9 has a base-emitter voltage of 38.5V which says that the base-emitter junction is open because a good NPN silicon transistor can only have a forward base-emitter voltage

Interesting project, have you made further progress with this? Did you manage to use the Arduino or are you still using the FTDI chip instead? Thanks Saevar

Hi Matt, Sorry for the late reply. I had not checked after I did get a chance to buy one. Price was too high for me. Fair Radio Sales had two for sale each for $450 with no takers for over a couple

I'd been trying to poke at this between work, so admittedly was a bit distracted. I did find the 2n3904 Q10 to be bad and have replaced. here is the full supply now that i've had some focus

That does make sense, thank you for that explanation.. I do believe I've stated it backwards. 22v appears on a 2n3053 that I've replaced at pin 3, which is actually the collector..

Bill, Lets back up a minute… If there is +22V at the emitter of the driver Q9 then there must be +22V at the base of the series regulator Q4 and you say that there is less than 1V at the

groups.io <drkirkby@...> wrote: Using wget, it took about 36 hours to download the 200GB tarball over gigabit fiber. My second downloaded was via torrent, which has

[email protected]> wrote: Thanks, but both of my downloads of 16901-14102.iso from IA were done over gigabit fiber. That's not the limiting factor. Also, I have with very high confidence determined

[email protected]> wrote: Unfortunately archive.org is slow, so irrespective of what speed you have, you are not going to be able to download it quickly. I would suggest trying wget, curl, or at a

Ok.. I had a few bad transistors in the mix, but the one that was in the unit checks out ok. I tossed a small handful to alleviate future issues. I spent a little time simulating this and from

If someone wants to send me a URL, I could try pulling the file from a fast connection.

I'll check these over lunch. Interestingly, two of the original transistors in that spot cause the 3a fuse to blow. Now sure if thats indicative of something else going on w/ a good transistor in

Bill, 22V on the emitter of the driver is very strange. It seems that the pass transistor Q2 has an open base – emitter junction and a shorted collector base junction to come up with those

Thanks Michael, here's a recap what i'm seeing around the -12.6v line currently: .65v at base of q11 sensor amp, .275v on collector. Driver has 22v on emitter, .27v on base and -.27v collector. Not

Bill, OK so you have the early version of the supply. If you give me the voltages at the base of the driver transistors I can perhaps give you some more pointers. Mike Sent: Thursday,

The zener string is holding for now. Not concerned with it just yet. I've managed to fix the 248v rail by replacing driver, a zener and a si diode. I did however lose my -1.5v trying to sort out

Or use "wget -c" which is similar to what Dr. Kirkby said but using "curl". For me archive.org also fails in 90% of the cases but I retry it and continue using wget and -c option. If you don't use

having received no feedback, I continue with a brief update on my attempts to bring my HP8595E back to its former glory 3 Summary and state of the art: it all started with the failure of the main