| Farnell FG1 Function Generator (1977/81) |
|I bought this of eBay for £16+P&P, the frequency dial and the potentiometer are missing, but all the boards are there, so i think it's going to make a for a nice little project.|
it's all working now,
i was able to find a 5k pot for the one that was missing for the frequency adjustment (it's a bit of a hack but it will be fine for now),
i was also able to find some replacements for the missing capacitors too (a 10uf for the 10sec sweep and a 10uf for the x1 frequency range),
i also replaced the 47ohm resistor and the two clamping diodes on the main amp board (the 47ohm resistor tested fine but looked burnt),
i also fixed the neon indicator on the front, cleaned the card connecter pins, switch contacts and fitted a power lead.
i've replaced the 5k potentiometer with a 10 turn 5k pot, i got off eBay, to give some finer control, it's not the best, but it works better then the single turn pot i put in.
Service Manual can be found at
http://www.collection.archivist.info/ OR Here
Posted: Thu the 28th of Jul 2016 - Updated: Yesterday
|Racal DANA 5000 Multimeter (1981)|
|i bought this of eBay for £38 + p&p, it needed a bit of a clean, but apart from that it works fine, plus all it's calibration seals were intact (well untill i took the top cover off),|
the one downside is that i didn't know that this model came as a base unit (back in the day), you would order it with the add-on cards that you needed,
so as you can guess the one i got is just the base model, although it can only measure DC, it can read down to 1 micro volt, so it will come in really handy,
plus that no-ones been in it since it was last calibrated, makes it even more worth the money.
you can see here that all they did was cut off the neon indicaters for the cards that were not installed.
here is where the AC/RMS, OHMs and the Ratio cards would of gone.
here's a little mod i added to surpport the controls a bit better, as they were not bolted to anything.
Racal-DANA 5000 Service Manual
Posted: Mon the 25th of Sep 2017
|Marconi TF1041B VTVM (1961)|
|i won this of eBay for £13.50 + p&p, as you can see it's pretty beat up (i removed the side panel before taking the pictures), but it looks like nothing is too broken that can't be fixed, the A.C probe has been cut off, but i think i should be able to come up with a DIY replacement, the metal case is a bit bent in places, but i'm sure i can straighten it out, some of brackets that hold the side panels on have broken off, but i'm sure i'll be able to fix that too, so all in all it looks like a nice little project.|
Marconi TF1041B Service Manual
Posted: Wed the 28th of Jun 2017
|Krohn Hite 2000 (1983)|
|I won this of eBay for just over £13+P&P, it was sold as Used (but untested), the light on the front did come on, but no output from any of the BNC's.|
After some testing, i found a short on the -25 volt rail of the power supply, i ended up cutting the wire links from the main board to the power supply, to track down the sort, it ended up being two of the tantalum capacitors that had shorted, i replaced all the tantalum capacitors with new ones of the same values, i only had to replace one resistor that i burnt out when testing for shorts.
After a bit of a cleaning, it's now fully working again.
radiomuseum.org - Schematic
Posted: Mon the 18th of Jul 2016
|Triplett RF Signal Generator Model 1632 (1940)|
|i bought this nice Triplett RF Signal Generator of eBay for about £16 +P&P, as you can see from the pictures below, it's looks to be in ok shape for it's age, it has had some modifications done to it, the transformer has been replaced with a 240 volt transformer, from the original that would of been a 120 volt transformer, for use in the U.S, the replaced transformer only has a 6.3 and a 300 volt center taps, (no 5 volt center tap for the 80 rectifier tube), who ever changed the transformer just used two diodes to replace the 80 rectifier tube, so i'll just leave it as is, it looks like some other components have been changed, but most look original, it's just a matter of going through everything before i even think of trying to power it up.|
Manual for the Triplett Model 1632 Signal Generator.
Posted: Tue the 8th of Dec 2015 - Updated: Mon the 28th of Mar 2016
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