#6900
Guenther
Participant

    Hi,

    yes – you are right, I could have made use of the HV transformer and the 2-stage amplifier, BUT: I use Lectron at first as a pre-testing tool before I build a “normal” (none-Lectron)  version or a new Lectron block.

    In this case the limit of – total – 2 transistors was given by the BOY’S RADIO idea, more: see coming post. I had a lot of small transformers (and still have a couple of these) so to build a suitable Lectron transformer block is no problem. In this special case I had no free contact(s) for the AF output (or only diagonal, that’s bad…) so I first used the earphone socket. With a suitable plug + cable for a transformer-input it works, but I decided to built a separate block, so I don’t have to collect and place single blocks all over the ground plate just for testing another version – keep it simple!

    Transformers: the first Lectron transformer from G.F. Greger was described in a patent applicant May 7th 1965 (# 1,228,081 Germany). Gerd Kopperschmidt realized it with blocks #2710 and #2712. Around 1970 Max Guerth built two of these (with tap !), and Harmut Birett in the 1970s for his Physics class. The cover images can be found in my “Electronic Lectron Card File” at line 415, 417 (Lectron RWO), 455, 456 (Max Guerth) and 604 (Hartmut Birett). The total amount is about 900 so it may be a help for positioning the thumb scroll bar.

    Best,

    Günther

    • This reply was modified 4 years, 8 months ago by Michael.
    • This reply was modified 4 years, 8 months ago by Michael.
    • This reply was modified 4 years, 8 months ago by Michael.