Since I’m still waiting for appropriate weather to finish the 6AS7 SET chassis, I’ve been making progress on a small project for the aluminum chassis from the last post. I decided to put together the “Color” preamp from the post a few days ago. This project will make use of one of the Hammond discount power transformers about which I posted a couple of weeks ago. It’s coming along well, but VERY slowly.
Frankly, I had forgotten how much I dislike working inside a cramped chassis. Lately I’ve been doing most of the assembly on my amps working with the flat aluminum plates. It’s a dream compared to having to work inside a project box. Here’s how far I’ve gotten on the preamp project.
I have installed all the parts on the chassis except for the volume control. It will arrive in a few days. I’ve wired in a ground lift switch. The transformer primary circuit is complete. The filament and lamp wiring is all completed as well. I’ve wired the rectifier socket and the main filter choke is wired in. A few filter caps, a dropping resistor, and a bleeder resistor and the main power supply will be complete.
When the project is complete, I’ll write up a full project page with all the information and test results for the preamp. Hopefully, in a week or two, the weather will begin changing and I’ll be able to make some progress on the SET chassis. Till then, I’ll be working on bringing this project to life.
As always, questions and comments are welcome. Honestly… I really mean it. Drop me a note… let me know what you think… really.