yes I used deoxit on the pots followed by a lubricant. I did find a wiring error going to the trimpots, which I corrected. what happens now is in the mini-lytic and mica,etc., the eye closes when I adjust those two pots when calibrating but then start fluttering open and close. what resistance...
I resoldered all connections. I hung a 22ufd cap on the line that feeds the bn8 grid. that got rid of the noise and also enabled me to calibrate the min lytic position. the mica,etc. position still is a problem. somrtimes it will calibrate, but then open again? that's it for now.EDD I confirmed...
well, its been awhile since I messed with this thing. to the best of my recollection it worked o.k. but, you know I started to check the line that feeds the grid of bn8, and noticed a lot of noise with some big spikes. as far as the wiring I checked , and can"t find errors. can the noise on the...
slight diversion. an iguana has taken up residence in my garage. trying to figure a way to get rid of him. I dont't think I want to touch him. ugh! anyway, hve checked wiring as per edd's excellent diagram. no errors found. one quesrion. with the type switch in mini and the volt sw ser at 25v...
I thought it did work. at 81 years old my memory is somewhat suspect. I have the orig construction manual so i'am pretty sure I built it.and yes it did work. I think.
thanks so much for your help. i'am going to recheck those voltages again. yes the switch was in electrolytic pos. also set to r1. the voltage switch was not set to 3v. I think it was 25v?
this unit worked for many years. trouble with adjustments(15ua/2ua) was recent observation. checked resistor reads ok. grid resistor for 6bn8 measures 1.8m not 1.5m. I must admit i'am losing heart. but somethings wrong.
the bplus is 180v at the output of the volt divider. 6BN8 pin1 minus44v, pin2minus12v, pin3 0v, pin6minus12v, pin7 97v,pin8 minus6v, pin9 minus2.4v. 6E5 pin2 126v, pin3 minus43v, pin4 180v, pin5 0v.