Al,
Thanks for all that meticulous attention and for the kind, positive comments about my build. I hand't worked with a soldering iron in a few years but once I got the cobwebs out I LOVED the building experience and have really caught the DIY bug.
Brian overnighted some tubes and new caps for the Power Supply PCB. The technician has them now and will be working on the amp tomorrow morning. I should know something tomorrow afternoon at the latest. I'm hoping it's something simple.
Yes, you are correct (and very observant, by the way) about the output transformers. The color of the wiring has changed since earlier versions of the kit and I had to ask Brian what the correct colors were. He told me that green is 0 (ground), blue is 4 ohm and yellow is 8 ohm. (I think that the earlier versions had a purple wire for the 8 ohm tap.) I deliberately didn't cut the unused, 4 ohm leads but bundled and shrink-tubed them in case I ever want to run a 4 ohm speaker.
The most challenging aspect of the build was that I was working with the previous version of the Assembly Manual, supplemented by a "beta" version of the latest Manual edition. Most of the design changes in the 2014 version of the Kit 1 have not been radical, although, as you noted, the Filament PCB has changed quite a bit (the whole heat sink configuration is quite different) and things like the lead colors on the OPT's have changed, too. So I corresponded with Brian whenever I had questions and, when I was uncertain at all, I tried to be extra careful not to solder anything until I was totally sure I had it right (although I'd have done that, anyway, given how slowly I tend to work).
By the way, a very pretty, updated manual is almost completed. I offered to send suggestions for the new edition to Brian and he accepted. I told him he could use photos from the blog if any of them are useful. So the bottom line is that future builders of this amp will have VERY nice, clear instructions to follow!
I don't think I mentioned this earlier, but the tech said that the amp wasn't putting out anything close to 8 watts, so there's something very funky going on with the power section. Again, I'm hoping it's simple!
Thanks for all that meticulous attention and for the kind, positive comments about my build. I hand't worked with a soldering iron in a few years but once I got the cobwebs out I LOVED the building experience and have really caught the DIY bug.
Brian overnighted some tubes and new caps for the Power Supply PCB. The technician has them now and will be working on the amp tomorrow morning. I should know something tomorrow afternoon at the latest. I'm hoping it's something simple.
Yes, you are correct (and very observant, by the way) about the output transformers. The color of the wiring has changed since earlier versions of the kit and I had to ask Brian what the correct colors were. He told me that green is 0 (ground), blue is 4 ohm and yellow is 8 ohm. (I think that the earlier versions had a purple wire for the 8 ohm tap.) I deliberately didn't cut the unused, 4 ohm leads but bundled and shrink-tubed them in case I ever want to run a 4 ohm speaker.
The most challenging aspect of the build was that I was working with the previous version of the Assembly Manual, supplemented by a "beta" version of the latest Manual edition. Most of the design changes in the 2014 version of the Kit 1 have not been radical, although, as you noted, the Filament PCB has changed quite a bit (the whole heat sink configuration is quite different) and things like the lead colors on the OPT's have changed, too. So I corresponded with Brian whenever I had questions and, when I was uncertain at all, I tried to be extra careful not to solder anything until I was totally sure I had it right (although I'd have done that, anyway, given how slowly I tend to work).
By the way, a very pretty, updated manual is almost completed. I offered to send suggestions for the new edition to Brian and he accepted. I told him he could use photos from the blog if any of them are useful. So the bottom line is that future builders of this amp will have VERY nice, clear instructions to follow!
I don't think I mentioned this earlier, but the tech said that the amp wasn't putting out anything close to 8 watts, so there's something very funky going on with the power section. Again, I'm hoping it's simple!