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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps. |
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#1 |
Octode
Join Date: Mar 2013
Location: Leicester, UK
Posts: 1,675
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I have just recently acquired a Farnell TM39 Microvoltmeter. It seems to a quite well made if rather large instrument and seems to be in working order. Interestingly is has provision for two internal PP9 batteries and has a logging feature, although I'm not sure what this connects to? On the rear there are two sockets for a 'pen recorder'? The movement seems operate freely and does centre correctly when no power is applied. A quick test on the 10v range shows that the deflection is about correct in both directions, but I can't get it to zero when power is applied. The indicator is stable and there is a certain adjustment range of around one major scale division available, but it always stays to the left of the centre position between the 4 and 2 mark.
The fault is probably nothing major (faulty pot perhaps or leakage), but I have been unable to find a manual or schematic online. I did come across a manual for the TM2 which seems to be an older but similar instrument and a TM4 which is an RF version of the instrument, but I can't find anything for the TM39. Does anyone have a circuit diagram for this by any chance or come across a user/service manual? Last edited by WaveyDipole; 26th Jun 2019 at 2:42 pm. |
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#2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 15,324
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Thread title edited at OP's request.
Several posts moved to a new thread here:- https://www.vintage-radio.net/forum/...d.php?t=157617
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Graham. Forum Moderator Keep the soldering iron hot. |
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#3 |
Hexode
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 454
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I too would like to go on the record as looking for service information for the TM39, also the TM1 and TM2
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- Julian It's good here ![]() |
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#4 |
Pentode
Join Date: Mar 2013
Location: Leeds, West Yorkshire, UK.
Posts: 229
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#5 |
Hexode
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 454
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Thanks so much to Short Wave for the link, and Wavey Dipole for his PM with helpful comments on the TM39
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- Julian It's good here ![]() |
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