figuringstuffout
Well-known member
- Joined
- Dec 10, 2011
- Messages
- 45
Ok, so I feel like I am getting much better at this building tube guitar amp thing, but am stuck on a fender 5e3 delux build currently. I am following the triodestore layout but with a completely different preamp section (one gainstage with a cathode follower into a vox tonestack and into another gainstage. from there it hits a split load PI and into the 6V6 output)
Well, I currently have two issues.....
1. Upon initial start-up, the B+ on the 5y3 was 367v until i turned off the standby switch. At this point the B+ jumped to like 470v or so before I switched the amp off. Concerned, I checked everything, re soldered lots of connections, didnt find anything wrong and tried it again. Low and behold, things seem to be working now. So I'm concerned that I may have an issue that will crop up later....any ideas as to what happened (is happening?) Not sure if it is relevant but the DC resistance from B+ to ground (post 5y3) is infinity (or at least higher that my multimeter goes - 2M).
2. I have gain, high, low, and master volume controls for the preamp and for some strange reason when I have both the gain and master down all the way I get some super annoying static noise (not too loud but not quiet either) that goes away when either volume raises a tiny amount. Don't know if it is relavent but I do have a bright cap (180pf) on the master volume pot. I have checked the grounding (using bus into a star) and can't find any issues. I will also add that when I shunt the last gainstage (going to the master volume) to ground I get a seriously loud squeal for some strange reason. I imagine the two of those issues are related but can't figure out why either would be happening. Ideas?
Thanks for the help!
Well, I currently have two issues.....
1. Upon initial start-up, the B+ on the 5y3 was 367v until i turned off the standby switch. At this point the B+ jumped to like 470v or so before I switched the amp off. Concerned, I checked everything, re soldered lots of connections, didnt find anything wrong and tried it again. Low and behold, things seem to be working now. So I'm concerned that I may have an issue that will crop up later....any ideas as to what happened (is happening?) Not sure if it is relevant but the DC resistance from B+ to ground (post 5y3) is infinity (or at least higher that my multimeter goes - 2M).
2. I have gain, high, low, and master volume controls for the preamp and for some strange reason when I have both the gain and master down all the way I get some super annoying static noise (not too loud but not quiet either) that goes away when either volume raises a tiny amount. Don't know if it is relavent but I do have a bright cap (180pf) on the master volume pot. I have checked the grounding (using bus into a star) and can't find any issues. I will also add that when I shunt the last gainstage (going to the master volume) to ground I get a seriously loud squeal for some strange reason. I imagine the two of those issues are related but can't figure out why either would be happening. Ideas?
Thanks for the help!