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73831

Re: OT: Wiltron 360 NWA Disk Needed

Thanks for your kind offer. In the mean time the floppy drive turned out to be the culprit. I replaced it successfully with a USB floppy emulator. However,
adrian_microwave
4:25 PM
#73831
 
73830

Re: Available: replacement brass gear sets for the 8640B

That shouldn't be hard to do. :) I have an older model and, for some reason, the gears have held up well in it. Those do appear to be nice replacements.
Barry
10:51 AM
#73830
 
73829

Re: Available: replacement brass gear sets for the 8640B

Wow, those are beautiful. Nice work. I may have to find a broke 8640 now.
maxfrister
10:45 AM
#73829
 
73828

Available: replacement brass gear sets for the 8640B

Dear friends, Not surprisingly, I discovered that my 1983 model 8640B signal generator bought on eBay suffered from the infamous problem of cracked
rajani_38
8:55 AM
#73828
 
73827

Re: Looking for a replacement part for HP 721A

Thanks a million! Yes, I found the smoke let'r outer! It wont happen again. TNX es 73 -- Paul K. WA0BAG
Paul K.
7:41 AM
#73827
 
73826

Re: HP 54542C Scope

Hi Michael, thanks for your update. I have got a 54542A which is widely identical to the 54542c and I had similar problems in 2013. In my case the problem was
Erik Baigar
11:55 PM
#73826
 
73825

Spare 8662A A2 front left DCU Cover?

I bought a 8662A with missing left DCU cover. This is the cover over the sweep card not the GPIB/CPU/RAM/ROM. Anyone have one to spare? Eric Haskell
kc4yoe
11:01 PM
#73825
 
73824

Re: HP 54542C Scope

Hello again, Here's an update on the HP 54542C. First, I want to recap, this rig seems to be working, all functions as far as I can tell. The noise, which is
michael.rosanbalm
10:19 PM
#73824
 
73823

54501A parts

I have a 54501A digitizing scope---not working---I will sell for parts or repair. Nice looking physically, powers up, screen ok but several error messages and
Paul Kraemer
6:59 PM
#73823
 
73822

Re: Looking for a replacement part for HP 721A

... Precisely - I would look for a base-collector short in Q4. That would lower the current limiting resistance to about 560 ohms and increase the current
Dale H. Cook
Feb 8
#73822
 
73821

Re: Looking for a replacement part for HP 721A

Classic thinking Dale !.....zeners usually have a resistor in series to determine the current.....it must have taken excess current to smoke.........that
Alan Melia
Feb 8
#73821
 
73820

Re: 8753A Monochrome Display Available

Dick I'll take the display, email sent Chuck On 2/8/2016 7:45 PM, 'Dick Benson' w1qg@... ... -- See Early TV at: www.myvintagetv.com
ChuckA
Feb 8
#73820
 
73819

8753A Monochrome Display Available

Greetings, Circa 1 year ago I replaced the monochrome display on my 8753A VNA for a spiffy Simmconn Labs LCD. The monochrome display was in excellent shape, I
Dick Benson
Feb 8
#73819
 
73818

Re: Looking for a replacement part for HP 721A

Looks like a 7V zener.  You can probably substitute a 6.8 or 7.5V unit, maybe 250 mW.  If you want to get close to 7V you can measure a few to see if you can
Bob Albert
Feb 8
#73818
 
73817

Re: Looking for a replacement part for HP 721A

... Later production calls for an HP 1902-0190 7.5 volt +/- 5% Zener for CR7. ... You will very likely smoke the replacement unless you first determine and
Dale H. Cook
Feb 8
#73817
 
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