Tube Amp Archive

Sorry it took me so long to reply...I've been tweaking a reverb-o-express beast for a while...in addition to finals coming up.

I was saying that you should put in a DPDT switch, and switch both the hot and neutral from the wall, if it isn't already done.

I'd wire it up modern safety standards while adding the 3-prong plug...remove the polarity switch, make sure the hot wire is fused, switch both if you have a DPDT power switch, and secure the ground wire to the chassis close to the entrance of the power wire.

Noel, The horizontal thing is the star ground for the preamp. It's connected by one wire to the star ground, on the blue board to the right, for the PA and first filter caps. I've build several high gain amps, and tho I sometimes do things unconventionally I do have the golden rules of lead dress in...

Forgot to mention that after 9.5 (ie, maxed) on the gain, the 120 Hz buzz goes away...like completely. Here's gut shots. Forgive the extras, they're for reverb and PA B+ voltage control. The 3rd stage is an anode mixer. [IMG:1024:768]http://i288.photobucket.com/albums/ll187/bgtonalpursuit/IMG_0337.j...

Forgot to mention that after 9.5 (ie, maxed) on the gain, the 120 Hz buzz goes away...like completely.

Here's gut shots. Forgive the extras, they're for reverb and PA B+ voltage control. The 3rd stage is an anode mixer.

Just cranked on a new Express build, and I'm having a couple issues. The biggest problem is that with the gain anywhere from 0-9.5, there is a proportionately loud (and TERRIBLY TERRIBLY so, at that) 120 Hz buzz. I've built a few amps, but I've never had one act like this. The layout is fairly close...