Hey y’all, I’ve had this non functional Gibson EH150 sitting around for a couple of years now. A friend of a neighbor was looking to turn it and a Gibson EH125 lap steel into some quick cash. So I ended up buying them both for a reasonable price. Here are a couple of pics from the day I went to take a look at them. Clearly the original speaker is long gone. Replaced by this lovely 70’s RadioShack Realistic ceramic mag speaker. So anyhow, the amp has been in my shop for a couple years now and I’m thinking about getting it up and running. So I removed the chassis from the cabinet and pulled the tubes for safe keeping. I’m not sure if they are still good, but i’ll deal with them later. Here is a shot of the guts. Looks like some of the caps were replaced decades ago. I believe the big paper tube capacitor with the wires coming out of one end is one of the original multi caps. It also looks like a couple of large resisters were installed in parallel across where the original speaker field coil would have connected as a power supply choke. So I am planning to recap it and I have a vintage Utah field coil speaker that I want to us in it. I’ll discuss the speaker later on as well. I’m still in the planning stage of this project at the moment and I have a question for those of you that are more knowledgeable about tube amp design. So looking at the schematic, I see that the first filter cap is (well, all of them are actually) a 10mfd. But on close inspection of the original INCCO multi cap, I can see that it was a 20-10mfd. So looking in a copy of the 1950 RCA tube manual, it says the max filter input capacitor for a 5U4G (not 5U4GB) is 10mfd. So how was it acceptable for Gibson to use a 20mfd instead of a 10? Also, maybe I am just making the assumption that the 20 would be the first cap. I don’t really have a way to tell If the blue wire or the red wire (mostly gone) was for the 20 half or the 10. I know where each wire was connected in the circuit, but no way to know the values since the cap is way beyond no good. Any words of advice? Should I just replace with all 10 mfd’s per the schematic. I’ll post updates as I progress through the project. It should be fun and interesting.