squalle 0 Report post Posted January 10, 2006 huh? ur plate there's no voltage? hmm i think in that case u've just blown ur jfets I think you've miswired some things somewhere Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 Okay ... i measure the wrong point... plate volt lowest i can get is 47v. Reversed my volume pot. Not sure whether my trimmer is soldered correctly.. It is just connect the center pin and the 2 either pins. Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 The jets isit connected like 1 jfet on top, 1 jfets 1 grid lower den the center 2 pins connect to each other of the jfets Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 REally somewhere is wrong... I turn 1 trimmer whole plate voltage increased Share this post Link to post Share on other sites
squalle 0 Report post Posted January 10, 2006 if u reduce the trimpot value, voltage at the plate should drop if u increase the trimpot resistance, the plate voltage should increase did u put fixed resistor besides trimpot? did u wire the trimpot correctly? out of the 3 legs, how did u wire them? that's how I put the jfets for my 2 unit, too but there's another connection, have u connected it? the top jfet S leg to the lower jfet's D leg Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 yep for the jfets even for the D to D too. Eg The trimmer i connect the center pin to the left pin and connect the cap to it and out it goes to the tube socket and gnd. The left over pin i connect it to 560 and out it goes to the same tube socket pin. Share this post Link to post Share on other sites
squalle 0 Report post Posted January 10, 2006 huh? why tube connect direct to ground also? then your trimpot is practically useless. that's why your voltage not changing when u turn the trimpot and one more thing, D is NOT connected to D D at the top, goes to 60V line D of the lower jfet connect to S of the top jfet read the schematic properly Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 fixed... i place the jfets in the wrong orientation... the gate got connected instead of the source... now its working cept for the buzzing... haven put output resistor yet... Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 My first SOHA!! Detail now as good as PPA. Have the warmness there... Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 Somehow i felt that the 2132 is limiting the full potential of the set.... Share this post Link to post Share on other sites
squalle 0 Report post Posted January 10, 2006 limitting in wat way? 40mA is good enough I think.. hehe so is the buzzing solved? Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 I means it doesnt sound as good as what i expected.... The buzzing tml den settle. Been working on it for 15 hours straight... Share this post Link to post Share on other sites
squalle 0 Report post Posted January 10, 2006 for buzz, try redo the 3 wires from the trafo either tuck it hard or something when the unit is on, but becareful, dun get electrocuted oh yea, have u got any fluorescent lamp that's nearby? turn it off and listen again. Share this post Link to post Share on other sites
Kippei 0 Report post Posted January 10, 2006 I packed the hot ends with 2 layer of heatshrink.... betta safe den sorrie.... But i got a few time buzzless and quiet but dunno what i touch. Share this post Link to post Share on other sites
squalle 0 Report post Posted January 10, 2006 try and try again to redo what u've just done which side u put heatshrink? o yea, the DC blocker at trafo's primary winding, it will make the trafo really runs a lot cooler Share this post Link to post Share on other sites
