gres
Full Member level 4
If someone thinks that device remind him Kasprzak deck from M91xx seris, he’s right. It’s provably the world’s only deck that can take off characteristics of electronic tubes. Most elements are from recycling. Of course some parts like slots, IRFP450 transistors or Zener diodes are new. Also toroidal transformer I need to buy but it’s second hand.
Project is a modification of Traxman design https://www.trioda.com/forum/viewtopic.php?f=25&t=12421
Measuring instrument except checking E series lamps can check also some P series lamps that glowing of 300mA current from power source LM317. Food for lamps can work with most lamps of E and P series with plinths heptal, noval, octal, magnoval or loctal. Second food is fore typical audio lamps : -noval with: duotoroidal (ECC83/6N2P) EF86 or power pentode that has pins similar to EL84.
-octales for duotoroidal 6N9S or 6N8S and pentodes and power tetrodes with pins similar to EL34 or 6L6.
I didn’t make food for EL90./95 or 6P1P bouse I have balun for that.
Device is not very exactitude because for calibrating I used chinesse multimeter. The same multimeter is a measuring instrument in device.
Power system Ua is very similar to this from link above. Ug2 system is exactly the same as Ua. Only one difference is that in first switch position, it don’t gives voltage while Ua gives 90V. Ug1 gives negative voltage between 1,6V to 18,7V. you can set that by potentiometer. Voltages for Ug1 and power source 300mA are given by transformer from VHS player. System are placed on common board and one radiator. That is not a perfect solution!
This device has two advantages: 1 it is 2 is cheap. Disadvantages: - too big, difficult service.
Original text is at https://www.elektroda.pl/rtvforum/v...rk=topic&sid=ea21b428cf7874a3e5dd486b6ecdece8
