1 fistpicker 1 year ago In an attempt to get back into amp building after a decade or so I salvaged the transformers out of an old Grommes PA and built a spitfire clone. I compared a few schematics and layouts found online and knocked it togetherI had to use an EZ81 rectifier since this PT didn't have a 5V winding. It powered up just fine. Zero background noise. So quiet I thought it wasn't working at all until I plugged a cord in. Running new JJ EL84's and 12AX7's It sounds, bad. Brittle, harsh and thin. No headroom at all. Even though the EL84s are running at 16.4 watts (double checked the bias last night) the volume is lower than my 5F2-A through the same speaker cab. All my voltages correspond (within reason) to the schematics. Swapping the tubes changes nothing. All overdrive seems to be from the preamp since the sound doesn't change from full volume to dialing down the master.Any tips for a guy who is a bit rusty in the troubleshooting department?