Some questions for tesoro IB desing ED180 disrciminator

[jaccob]

http://www.youtube.com/watch?v=uYUxQUU5sLw
http://www.youtube.com/watch?v=s0BTkMuBh7g
Heloo this i my eldorado,works good and deep but i want modified this eldorado to eldorado umax with ED180 disc,this old eldorado have only 120 degree discriminator,this means,if i set disc knob in min position eldorado cannot detect iron objects,Have anybody schematics for eldorado umax or ED180 discriminator? And last question is about ground balance why when i set groundbalance to max position detector cant detect large conductivity objects as large silver coin??

[porkluvr]

Heloo this i my eldorado,works good and deep but i want modified this eldorado to eldorado umax with ED180 disc,this old eldorado have only 120 degree discriminator,this means,if i set disc knob in min position eldorado cannot detect iron objects,Have anybody schematics for eldorado umax or ED180 discriminator? And last question is about ground balance why when i set groundbalance to max position detector cant detect large conductivity objects as large silver coin??

I can't help you with your finding the uMax schematic but if you were to post your schematic for 17.5kHz I may be able to figure out how to make it so that large silver won't get rejected at discriminate = full clockise.

[kt315]

GMT1650 has ED180 disc. if anyone will share some ad info about the PCB I will give detailed info what you have to mod. must be simple - I see there are two resistors 100k. but do not see points of connection.