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I would have liked to use a thumbwheel selector switch similar to a Avo VCM, which I'm used to, but I wasn't happy with the ones that were readily available so I decided on this layout of sockets.Although there is some duplication it does mean I can use the familiar Avo Data Manual settings and it works well for me.Ive never before seen such a detailed and next to perfect construction manual! I mixed the two 121k Ohm resistors up with 12k1 resistors, which resulted in -4V instead of -40 Volts. You may want to put a warning into the next revision of the manual. However, on the pictures in the manual, it is also not populated. Dear Ronald For quite a lot of years ago together with Lauri Salasmaa we ordered u Tracer, and these two were the very first u Tracers in Finland. Now one of my RA-friends came to me to see the Racal RA 1772, which I have in my hamshack, and he was very interested in the u Tracer.Whenever a question came to my mind, it was already covered in the next sentence of the manual. I finished the circuit, made the first measurement (a half of ECC8? Then I designed the box for these two instruments, which I even manufactured, and I put my print in it, but then my forces ended. He has now studied the u Tracer-pages, and maybe he shall build his own instrument, too. The other, built by Salasmaa, is similar, even the colour of the box is the same.
On one of the photos in this socket is tested a Russian miniature triode 6? I bought the kit when living in the UK, then moved to Tasmania for a while where the u Tracer was assembled and tested.
Thank you for offering a wonderful miniature Tube Curve Tracer.