🔴 Soviet P5025 Decade Capacitor Repair - No.1244

Soviet P5025 Decade Capacitor Repair
I repair a old soviet era decade capacitor unit and replace some missing parts.
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Fluke
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8842A:
45: defs.link/?u=eac51d
343A: defs.link/?u=13c93d
540B: defs.link/?u=0c6bd9
5200A: defs.link/?u=a43c99
5450A: defs.link/?u=3c6292
HP/Agilent/Keysight
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5342A 18GHz: defs.link/?u=5f7513
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8012B: defs.link/?u=ca5764
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8901B: defs.link/?u=535835
DSOX1102G: defs.link/?u=a68d39 defs.link/?u=12d498
E3646A: defs.link/?u=128f4a
Marconi
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2022D.
2955: defs.link/?u=6f6e5e
TF2103: defs.link/?u=61baaa
Rohde & Schwarz
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SMY: defs.link/?u=93514b
CMU200: defs.link/?u=8ccd72
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Siglent
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SDS1104X-E.
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SDS2104 X Plus.
SPL-1008.
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UNI-T UTi260B Thermal Imager: defs.link/?u=f3283d7 (use discount code: BG45411)
KSGER T12 Soldering Iron: defs.link/?u=620ace defs.link/?u=5c112e
Quick 861DW: defs.link/?u=138c0f defs.link/?u=a3fc81
Pro'skit SS-331 Desoldering Station: • 🔴 ProsKit SS-331 Desol...
S-993A: defs.link/?u=079677 defs.link/?u=e855a0
EEVBlog BM235: defs.link/?u=12d498
YR1030 Battery ESR: defs.link/?u=c56527
Heathkit IT-12 Signal Tracer.
Racal Dana 1992: defs.link/?u=8eeeba
Bird 43: defs.link/?u=4b18f7
Sinadder 3: defs.link/?u=2bf1dd
Audio Control SA-3050A RTA: defs.link/?u=a04df2
Korad KA3305D: defs.link/?u=69090a
PDVS2mini: defs.link/?u=869ba4
Valhalla 2703: defs.link/?u=06bcfc
Feeltech FY6800: defs.link/?u=8b98cd defs.link/?u=34d101
Eakins Microscope: defs.link/?u=b0278b defs.link/?u=262327
Mustool G600: defs.link/?u=b8bc26 defs.link/?u=33f0aa
Uni-T UT210E: defs.link/?u=391ce3 defs.link/?u=ea4edc
DER DE-5000: defs.link/?u=0d9160 defs.link/?u=12d498
MK-328: defs.link/?u=0d9160 defs.link/?u=739ee7
MESR-100: defs.link/?u=0d9160 defs.link/?u=009419
ESR Meter: defs.link/?u=0d9160
HOPI: defs.link/?u=7fab55
PeakMeter PM6252: defs.link/?u=59ef66
HS1010: defs.link/?u=10c699

[@ZhuraYuki]

This decade capacitor box is built with two types of capacitors:
1. Smaller ones (ССГ) - use mica film as dielectric, have very high stability.
2. Large ones (МПГО) - polystyrene film capacitors, these are also very stable but additionally have very low DA. Soviets used them in calibrators and voltmeters as integrator elements.

[@TheDefpom]

Thanks for the extra information.

[@TheEmbeddedHobbyist]

You still have the "Capacity" to amazed that after all those years being upside down and down under you can still count down from ten to one. :-)
Nice bit of old school kit, built to survive a UPS delivery.

[@IanScottJohnston]

Looks like part of Doc Brown's amplifier in BTTF!

[@bblod4896]

Looks like an old telephone switchboard. 🤠

[@NiHaoMike64]

I would have installed SPDT switches where the shorting connectors were, with the off position discharging the cap through a resistor.

[@TheDefpom]

Doing that had crossed my mind, but it would have been hard to actually do it, and it could have upset its operation from stray capacitance, which is why I elected to try and keep it original.

[@daveodessa]

Looks like it's built to survive a nuclear attack lol.Did you manage to repair the dents on the bottom panel?

[@TheDefpom]

Yep, I forgot to show it.

[@hectorpascal]

Why would you CHOOSE to use aluminium wire to make any removable plugs? Such a brittle wire! I would also be tempted to buy a small bar of PTFE and make up extra separators for the more vulnerable busbar crossovers. The added capacitance would almost certainly be negligible compared to the existing capacitance via the case (unless this has already been cleverly compensated for!).

[@TheDefpom]

I have to use the wire for something, and this is it, at least it is getting rid of it. if it breaks it is easy to fix too. It is not like this is going to get lots of use.

[@sveinfarstad3897]

Look for a microphone and transmitter ;-)

[@jw200]

Do you sell repaired equipment on ebay ?
You must have tons of it

[@TheDefpom]

Not on eBay no, items which I only purchased to make a video about fixing get listed on a site called TradeMe which is used in NZ.