Hi all - If it were not for TDPRI, I wouldn't be where I am now. I have been wanting a smaller amp that is portable and sounds good and that won't blow my family out of the house on 4 like my SF Deluxe Reverb will. With the encouragement of some here--especially @King Fan --I decided to build my own. I thought initially I'd build a 5f1, but it's a tight work space. The 5f2a is almost identical, and it has more work space (and a tone control). I'm going to build the tweed Princeton with a 10" speaker at 8 ohms. That's another reason I decided not to go with a 5f1. The Mojotone 5f1 kit comes only with a 4 ohm transformer, and they don't allow substitutions. The 5f2 kit comes with a transformer tapped for 4 and 8 ohms. I've been planning this for a couple of weeks now, and I so knew there were some parts I was going to want to replace. I ordered some F&T filter capacitors to use instead of the Mojotone ones, and I got two Mallory 150 coupling capacitors to use instead of the Orange Drops. I also ordered two Belton octal sockets and one Belton noval socket. Finally, I ordered a 1Meg Alpha audio taper pot with a SPST switch to replace the regular one that controls the tone on the 5f2a. The plan is to be able to defeat the tone control completely, which will essentially turn this 5f2a back into a 5f1 (with a 10" speaker). Those are my upgrades as of now. I also took the time while I was waiting to build a light-bulb current limiter, following Uncle Doug's video on YouTube. Last night I determined which end of the Mallory 150s was the foil-end, since it isn't marked on the outside of the capacitor. The folks over on this thread were very patient with me as I figured out how to apply a small amount of electricity to the body of the capacitor, first through my fingers, and then against the power cord of an amp in the "on" position, while I listened through the amp's speaker to determine where the foil was (more explanation on the thread). I marked the foil-end with a black permanent marker (it occurred to me later that somebody down the road might think they're burned or something. Oh, well). The chassis and small parts came in from Mojotone today. I opened them up, and I checked the inventory against the list. Everything looks good. You'll see in this picture that I wasn't able to resist getting the vise that @Romartin and @Outlaws mention on this 5E3 build thread. Then I got out my multimeter and tested the actual DCR of the resistors. I put some blue tape on the end of one of the leads of each of them, and I wrote the actual number there. I went through the parts box and replaced the Mojotone parts I decided not to use with the others I ordered (F&T, Belton, Mallory). Now the parts box won't close, because those F&Ts are honkin' big! I've been reading @robrob 's literature on electricity, amps, and amp-building and skimming build threads in the past week. Now to go to reading again before I start putting some things together in the next few days. But: Are there any remaining parts that seem to be a "must replace," either due to the nature of the material (e.g., carbon composition resistors, which tend to drift in value) or rating (e.g., 1 watt instead of 1/2 watt or 2 watt instead of 1 watt, etc.)? I can get some of them at a local electronics store, or I can simply order from Tube Depot, which is not far from me here in Chattanooga. Things arrive from Memphis rather quickly. More soon!