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Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 1:39 am
by bmf5150
Hey guys just got done building my new plexi and got a couple of odd voltage readings when checking the amp!!on v1 pin 6 only getting 163....and on v2 getting 263 on pin 7 and 8??thats kind of far off on voltage chart!! I'm posting pic of the voltage chart with all my readings written in!!i also not getting any sounds from the amp!thabks for the help...
Here is link to my voltage..
http://i1237.photobucket.com/albums/ff4 ... 17DB62.jpg" onclick="window.open(this.href);return false;
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 6:29 am
by axeman
Post some Gut shots
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 9:25 am
by YMI5150?
axeman wrote:Post some Gut shots
Include the input jack wiring. With these shots.
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 11:56 am
by bmf5150
thanks for the help guys,has to be something im missimg,i went over wire again,tried different tubes.
here is picture links
http://s1237.beta.photobucket.com/user/ ... my%20plexi" onclick="window.open(this.href);return false;
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 2:03 pm
by neikeel
Your voltage readings are not way off but V2 does seem a bit high on the grid of the cathode follower.
I would check over your tone stack wiring and particluarly the mica cap. Then follow the comnnections out of the tone stack through the two coupling caps to the pots. Are the voltage readings on pin 7 and pin 8 of V2 variable depending on where the pots are set on the treble/mids and bass?
Confess I cannot see any wiring mistakes either.......................
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 2:11 pm
by bmf5150
I'll have to check those voltages when I change the pot settings
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 7:11 pm
by bmf5150
Ok on v2 pin 7 and 8 there are no changes to voltage when treble ,mids or bass are moved.....
Re: Got my new plexi together , no sound and voltage issue?
Posted: Thu Dec 20, 2012 10:04 pm
by bmf5150
I set my volt ohm meter to test (where it beeps if touch two leads together ) and tested my grounds, all seem to be good!is there a wire off of treble pot that I can lift off and send a line level from another amp to by pass preamp of plexi to try and locate if problem is in power amp side or preamp???
Re: Got my new plexi together , no sound and voltage issue?
Posted: Tue Jan 01, 2013 9:00 pm
by Reeltarded
Yes youmcan wire a jack off the output of the treble and send that to another amp and wire a jack off the input of the PI and use that as a return for another preamp. You can drill holes and wire those together in suach a way that you make the simple effects loop since you are half way at that point.
