Levell TM14 Insulation Tester - UK Vintage Radio Repair and Restoration Discussion Forum

Chris55000 · 23rd May 2021, 8:03 pm

Hi!

I have finally after several years hunting, won one of these Levell TM14 instruments, so the first job on the agenda will be to redraw Levell's "kiddie scribbles" into something a little easier and clearer to read!

I do have a layout diagram of the PCB for one of these, but as I'd sneaked it out of a former employer, I felt unable to post it whilst they were still in business!

Now they are no more (Telford sold me a couple of T & M books with their library filing labels on them!) there is no longer any reason why this shouldn't be posted now, so I'll get it scanned as soon as I find it!

This diagram has the diode and transistor types on it which I know Members have been after!

I am certainly curious as to why Levell used "J" as the circuit reference for transistors tho'.

Chris Williams

WME_bill · 23rd May 2021, 9:24 pm

Chris>
Levell TM14.
Would the attached copy of the manual and circuit save you some effort.
I believe I might have a copy of the parts and transistor types, but cannot find it at present. So I would quite like your updated list.
wme_bill

23rd May 2021, 8:03 pm	#1
Chris55000 Nonode Join Date: Aug 2007 Location: Walsall Wood, Aldridge, Walsall, UK. Posts: 2,868	Levell TM14 Insulation Tester Hi! I have finally after several years hunting, won one of these Levell TM14 instruments, so the first job on the agenda will be to redraw Levell's "kiddie scribbles" into something a little easier and clearer to read! I do have a layout diagram of the PCB for one of these, but as I'd sneaked it out of a former employer, I felt unable to post it whilst they were still in business! Now they are no more (Telford sold me a couple of T & M books with their library filing labels on them!) there is no longer any reason why this shouldn't be posted now, so I'll get it scanned as soon as I find it! This diagram has the diode and transistor types on it which I know Members have been after! I am certainly curious as to why Levell used "J" as the circuit reference for transistors tho'. Chris Williams __________________ It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!