So what does one do when needing to keep twelve signal paths clearly separated and easily identified in a chassis? Actually the answer is remarkably simple.
Continue readingWiring in Technicolor
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Tag Archives: color
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I just posted the project page for the 12AU7 “Color” Preamp which I completed a couple of months ago. Why don’t you go check it out.
The Morning SET Swap
This morning as I sat down in my office to check email and the like, I looked over at the amp in the corner of the room and made a snap decision. It was time to perform a SET swap.
Continue readingNot Quite Done
There are a variety of sayings, axioms, proverbs, or quips which could apply to me this afternoon. A few which come to mind include:
“How wayward the decrees of fate are” – Vanitas Vanitatum – William Makepeace Thackeray
or this one:
“Pride goeth before destruction, and an haughty spirit before a fall” – Proverbs 16:18
or just the simple axiom:
“It ain’t over till it’s over” – Yogi Berra
In any event, it would seem that “Final Chapter” or no, I have one more post concerning the Color Preamp.
Continue readingThe 12AU7 “Color” Preamp – The Final Chapter
So I decided today that I really needed to close the book on the color preamp. This means that I couldn’t just prototype a new buffer and leave it at that. The preamp needed an end-to-end test in it’s final design configuration. So that’s what I did. The results were even better than before.
Continue readingThe 12AU7 “Color” Preamp with Improved Buffer
Lots of work has been going on the last couple of days working on an alternate buffer design for the 12AU7 “Color” preamp. As readers should know, I was not particularly pleased with the performance of the previous buffer circuit. It was bottoming out at too low a voltage. Now however, I have a simple change which yields much better results.
Continue readingThe 12AU7 “Color” Preamp is Complete
This afternoon I completed the “color” preamp and tried it out. I am very happy with the results.
Continue readingCircuit Reuse and Latent Design Issues
The “Color” preamp has been checked out on the test bench and everything is working per design. Bias points are good and the gain stage is operating exactly as designed. However, the buffer design I used was from a different project, and it operates differently in this project than the last one.
Continue readingThe Color Preamp is Fully Assembled
I had thought that the coupling capacitors I ordered on Tuesday would not arrive until this Saturday. However, the gods of DIY decided to smile down upon me and the capacitors showed up in today’s mail delivery. In my opinion, two days from order to delivery is exceptional. I spent some time this afternoon with a soldering iron in hand and the Color Preamp is now fully assembled.
Continue readingProgress on the “Color” Preamp
I’ve been working on the color preamp over the last few days as I’ve had time. My volume control and output capacitors are supposed to arrive today so it shouldn’t take too much longer to finish it up. However working inside the small chassis is a challenge.
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