Tube Amp Archive

Just wanted to post an update. Everything is working as it should! This is my first hands on with one of these things, (im a pretty diehard blackface fender kinda guy, as you could tell from some of the parts i used) obviously, this is a different animal. I'm really enjoying it! Thanks again to ever...

Ok....Thank you everybody problem solved.. I know for sure that the orange wire was grounded in the last amp it was in. I did add the CT 100ohm resistors and now im rockin! Perfect. I played with the orange ungrounded and grounded.didnt seem to be any difference. had 2 volts on it (orange). either w...

the orange is definitely not the bias tap..that one is red/blue stripe and I have it taped off..

Ill lift the ornge wire and see what happens, ill also check it for voltage an report back.

thanks

Then the orange one that is wrapped around the red wire with the white stripe is also grounded. I/m pretty sure that is for the heaters. I dont know what kind of PT it is either, I pulled it out of a Vibrolux a few years back. It's a little hot for an Express (about 450 on the plates) but it'll do. ...

Thanks,

I do have a center tap coming off the PT and it is bolted down at one of the Pt bolts. There are actualy 2 wires off the PT that are grounded. the center tap and the heater tap i think.

should I still give toh resistors a shot?

Johnny

ampdoc,

Thanks for your help.

Yes, I do have all the preamp grounds on the main bus, and I have tried disconnecting the input jack.... nothing.

Still buzzing.

thanks

Johnny

False alarm. wiggling the NFB actually exposed a cold solder joint on pin 6 of one of the EL34's so it was loosing power,thus the buzz would stop. Fixed that, buzz still going strong. When the volume is on 10, it actually gets a littel quieter, but it is constant. I tried covering the open side, no ...

WOW....

preliminary wiggles look like thats it!! I tried to get too cute with my lead dress!!!

Iron is warming now, Ill report back soon!

THANK YOU

Johnny

Hello all, Thanks for all the great information on this forum! While cleaning out the house a month or two ago, I doscovered I had most of what I needed to build yet another amp of some sort, I decided on a Rat-Rod Express. This was built with just stuff out of the parts bin so it isn't for the puri...