Date
Re: Plan to deep cleaning my gear
Just be careful about possible water ingress at the edges of the fiber glass boards. It can actually cause some problems with high impedance circuits (Been there...) I would use an ordinary oven and
By Ulf Kylenfall · #86242 ·
Re: YIG device failure modes
I regularly check eBay for spare parts list as “working�. Just keep looking. You would get what you want one day. Calvin
By Calvin Guan · #86241 ·
Re: Plan to deep cleaning my gear
As a fan of cleaning old electronics I would make a few comments: Look at a number of past threads on cleaning, Not everything really needs total cleaning, some things should not be "cleaned" and some
By ykochcal · #86240 ·
Re: Plan to deep cleaning my gear
Hi I would not soak the PCBs. Just blow away dirt using air. Somewhere I once read that the laminate of the PCBs can sponge up the water and I don't know whether this is nice. Better not to try it,
By Tobias Pluess · #86239 ·
Re: YIG device failure modes
Jeff, re-fitting a different YIG was an option which I was thinking about when I repaired my 8341A sweeper. The YIG is a 5086-7323 which operates from 2.3 to 7GHz and tuning coil sensitivity is
By Tobias Pluess · #86238 ·
Plan to deep cleaning my gear
Hi, I am thinking of deep cleaning of my gear. 8566 SA, 8510 VNA, 8515A S-parameter test set, 8350/83592 sweeper. I think I am going to remove all PCBs, soak them into clean water, brush them and
By Calvin Guan · #86237 ·
Re: YIG device failure modes
I have tested several hundred YIG devices over my career. (Have drawers full of them, its a sickness) I have seen more misaligned YIG support rods or bad oscillator semiconductors than I have seen
By Jeff Kruth · #86236 ·
Re: 3585B Spectrum Analyzer
Good tip Peter. I'll keep that in mind. Thanks, Peter ve3poa
By ve3poa@... · #86235 ·
Re: 8568B YTO unlocked
On my 8566b, if the span is greater than certain MHz, the sweep source is operate in “Lock and Roll� mode - locks to the sweep start frequency then applies a ramp to roll. Calvin
By Calvin Guan · #86234 ·
Re: HP 60’s Front Panel Color
For myself, I use Sherwin Williams. You need a small sample of the color. Roughly an inch and a half square and they will match it exactly. They will mix an industrial enamel in batches as small
By George Onufer · #86233 ·
Re: Restoring HP 1740A scope, strange waveforms seen, assistance please?
Hi everyone, many thanks for the tips and pointers, especially the one from Dave. I checked the switch contact, 1D is the only extra switch being used on all ranges from 0.5V upto and including 20V
By graham.l.n.butcher@... · #86232 ·
Re: HP items for sale
Hi Frank, Im interested in the 3400A depending upon the serial number prefix. If you could be so kind as to let me know. Thanks, Dave W6TE Sent from
By Dave Smith · #86231 ·
HP items for sale
Hi,I'm having trouble lifting heavy things now (surgery on both rotator cuffs), and the son will soon complete his Computer Engineering degree, move away, and then I'll try to move these and be
By Frank Hughes · #86230 ·
Re: 8568B YTO unlocked
I don't know about the screen flickering, but I do think the YTO loop behavior is normal. At wider spans it is not constantly phase-locked - it is driven open-loop with fairly accurate sweep current,
By Ed Breya · #86229 ·
Re: HP 8341A sucessfully FIXED!
Hi Tobias, Great job and a great write-up to go with it, thanks for sharing your work. Your story reminded me of something I learned from my first ever boss after I left school (over 50 years ago now
By Adrian Nicol <fenland787a@...> · #86228 ·
Re: HP 60’s Front Panel Color
Hi, I'm not sure there is an exact match in the RAL pallet. The nearest I have found for instruments of that vintage is RAL7042. That looks ok for panels that I wanted to 'tone in' with the HP
By Adrian Nicol <fenland787a@...> · #86227 ·
YTO coils in general..
Hi guys. Over the years I have read a lot about yigs going bad specifically their coils seem to go bad. Is there anything that can be done pre-emptively to secure their longevity? And what exactly
By W2HX · #86226 ·
Re: Restoring HP 1740A scope, strange waveforms seen, assistance please?
I am not familiar with that model (I have a 1727A) but if it is anything close to the Tektronix 465, there are attenuator switches operated from the panel control that may be making poor contact. I
By Bob Albert <bob91343@...> · #86225 ·
HP 60’s Front Panel Color
Can some please share with me the paint code used by HP for front panels in the 60’s? I have a very early 410C I’m trying to redo. The color is more dark than the RAL7044 used on the later 410C
By mmaseda@... · #86224 ·
Re: HP 8341A sucessfully FIXED!
Hi Ed many thanks! Yes, I was really lucky with my YTO. However, I am a bit afraid that the YTO could definitely fail some day and I would like to have a spare, but there's none :-( I even thought
By Tobias Pluess · #86223 ·