After having a ton of fun building a Boothill 5E3 and a Weber 6A14, I've decided to tackle Rob's Blackvibe Micro with a GZ34: https://robrobinette.com/RR763_BLACKVIBE.htm#BLACKVIBE_MICRO A big thank you is owed to all the guys and gals who post here, especially Rob. Though I'm sure he hears that enough! I've gotten so much out of this forum, but finished my first two builds realizing I barely took a single photo or any documentation of how the build progressed. So I'm hoping this time around my thoughts/ideas/mistakes might help another potential builder out there. I'll probably be slow to build and slow to post because ...life. I sourced the turret board from www.hoffmanamps.com using Rob's template, transformers from www.musicalpowersupplies.com, and almost all of my parts from www.tubesandmore.com, www.mojotone.com. I wanted to keep this as cheap as possible without major sacrifices, and I'm at about $350 total. The chassis I bought is going to be pretty tight for this build. Before I start drilling holes, I was hoping to get a few pairs of eyes on my layout. I've got the transformers crammed pretty tightly with the choke and OT 90 degrees from the PT. I hope there's no issue with the rectifier, choke, and cap can being so close together as well. I'm going to try to put the rectifier kind of in between (and behind) the PT and choke so it's easier to see when I (hopefully) show this amp off because well... tubes look cool. I tweaked Robs DIYLC layout to reflect these particular transformers since the wire colors are a bit non-standard. I also moved the power switch to the front, deleted an input jack, put an impedance switch in place of an external speaker jack, upped the cathode resistor value to 680ohms (I'll probably try a few values to get the bias right), and added a three-way preamp boost switch in-between the volume and treble pots giving me 270K, none, and 1M values for my vib ch load resistor to ground. I'm not sure if this will accomplish what I want without jumpering around the 220K channel mixing resistor, but I don't know how to do all that without some complex switching. Here's how Rob explains it: "Although the Blackvibe is a single channel amp I kept the AB763 220k channel mixing resistor because it has an effect on the phase inverter's overdrive tone and preamp gain. When testing the Blackvibe I realized it had quite a bit more preamp gain than my blackface Band-Master and blackfaced Bandmaster Reberb's normal channels. I soon realized I had underestimated the load presented to the normal channel by the vibrato channel. I added a 270k "Vibrato Channel Load" resistor to take the place of the Vibrato Channel's 220k mixing resistor and 50k Tremolo Intensity pot to ground(the Tremolo pot is also in parallel with a 100K plate load resistor to "AC ground"). The Blackvibe's 220k Mixing and 270k Vibrato Channel Load resistors form a voltage divider which attenuates the guitar signal by 45% just like in the two channel AB763. I did this to recreate the most authentic AB763 blackface normal channel tone but you can jumper around the 220k mixing resistor and delete the 270k Vibrato Channel Load resistors to add preamp gain if you prefer. Placing the Vibrato Channel Load resistor on a switch will provide a nice "Preamp Boost" when the resistor is disconnected. We can also raise the value of the Vibrato Channel Load resistor to increase preamp gain. A 1M load resistor will only attenuate guitar signal by 18% compared to the 270k at 45%." So that's my plan. Sorry for being so long-winded. Anyone see any signs of self-sabotage in my layout? Cheers!