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Date
Re: 8566B attenuator removal
I have now extricated the attenuator from the guts of the analyzer (see picture). Can some kind soul point me to the disassembly instructions for this thing? I've also included a photo of the spare
By Jinxie · #146860 ·
Re: 8566B attenuator removal
Okay, done a bit more testing. As was suggested, I bypassed the internal variable attenuator with a fixed 10dB one and attempted calibration once again. It now calibrates fine. I thought whilst I had
By Jinxie · #146859 ·
Re: HP 141T Power Supply Help Needed
No worries Mike.? You guys clearly have more experience.? I've just been doing my best to follow along.? I wanted to make sure I was understanding things correctly.? Seems like your close Bill!
By Frank Mashockie · #146858 ·
HP 339A Distortion Test Set repair/refurbish (hamfest find) (long read)
Hello All, As a possible opportunity to upgrade my? test bench's HP 333A, I recently obtained a HP 339A distortion analyzer of unknown heritage, but very late serial number. Physically, not in too
By Jim · #146857 ·
Re: HP 141T Power Supply Help Needed
Frank, I appreciate your calculations. Bill¡¯s problem is more fundamental than exact calculations would suggest. It seems that since the voltage at C6 (the bulk capacitor) is so low (<1V) that there
By Michael Bafaro · #146856 ·
Re: E4438c display problem, controler memory location please
By g8bxh@... · #146854 ·
Re: Leaking alkaline cells
The whole discussion of battery reliability reminds me of another issue a couple of decades ago. I was on a project that had to store many images in an image library. CDROMs were one option were they
By Tom Gardner · #146853 ·
looking for a scan of the HP8901A pull out reference card
I am looking for a pull out reference card for the HP8901A modulation analyser. Mine used to be rackmounted and lost its card in the mists of time. Now that I have repaired its PSU it is time to stick
By Wilko Bulte · #146852 ·
Re: Leaking alkaline cells
Morris, I've just checked the pack I bought them in and it says (proudly and in several places) "Made in Germany" so it would seem the ones available in the antipodes are made to an inferior standard
By Jinxie · #146851 ·
Re: Leaking alkaline cells
Forgive me if I missed something but I have not been following this thread very closely. I'm not saying they were wrong, but weren't environmentalists behind the EPA forcing removal of mercury from
By freshndaire · #146850 ·
Re: Leaking alkaline cells
I think the only Varta batteries I've used are for my watch and I think I got them from [ https://thebatterysupplier.com/ | https://thebatterysupplier.com ] Barry - N4BUQ
By n4buq · #146849 ·
Re: HP 5086-7906 YTO
Hi Adri Here are the measurements connected to the first 2 converters as a reference. For the second converter I get a voltage of -1.678V instead of -3.5V as written in the service manual, I would say
By Yves Tardif · #146848 ·
Re: Leaking alkaline cells
On Sat, Sep 7, 2024 at 07:55 PM, Jinxie wrote: > > "I don't know whether it's a manufacturing difference but down here in > Australia my experience has been that Duracells are not as bad as some of >
By Morris Odell · #146847 ·
Re: Leaking alkaline cells
Sure, take some flour and throw a cloud of it and light a match and it will explode.? But it won't do that normally.
By Peter Gottlieb · #146846 ·
Re: Leaking alkaline cells
A gander at youtube will find all sorts of daring do'ers that take apart the AA cell lithium replacements for alkaline cells, unwrap the lithium foil, and make them sizzle spit and spark, and catch
By Chuck Harris · #146845 ·
Re: HP 8568B from hell to Heaven... a restoration story!
Maybe so,? but no thanks to FedEx.
By Jinxie · #146844 ·
Re: HP 141T Power Supply Help Needed
Sorry, 38.6 x 0.707 = 27VAC.? 1/sqrt 2. -Frank
By Frank Mashockie · #146843 ·
Re: HP 141T Power Supply Help Needed
Mike, Wouldn't it be ~27VAC across the winding (11 and 13)? Or ~13.5VAC at both 11 and 12 and 13 and 12?? For a center tapped full wave rectifier Vout = Vp (sec)/2 - diode drop.? Since the center
By Frank Mashockie · #146842 ·
Re: HP 141T Power Supply Help Needed
Bill, 1.5V across R40 which is the bleeder resistor for the -12.6 bulk supply is definitely a problem. There are only a few things that can cause that. The next thing to do is check the voltage at the
By Michael Bafaro · #146841 ·
Re: HP 141T Power Supply Help Needed
Mike? Agree we've been through it all by now. I did find a bad trace to the base of C11, I jumpered R45 straight over to it. Voltages overall changed slightly, biggest difference is i'm now sitting
By Bill Berzinskas · #146840 ·