My biggest challenge when designing this particular amp was trying to be original. I mention in another thread that my design is closest in topology to a JMP Lite IIb. I came to my design organically and genuinely, but as I started looking at other potential ideas I came across the JMP Lite IIb... Which bummed me out. I have several different things going on in my design that I feel keeps it far enough away from litigation, but the fact remains that even while trying hard to be original, there is someone out there that has already done it more than likely. My starting point when I embarked was to make the amp be a Dr. Z Mazz 18-NR. My intention was to modify that topology. I was instantly not happy with it though. I tried perhaps 15 other topologies ranging from JCM-800 preamp to Bogner Ecstacy inspired ideas. All of them were just meh, and didn't do what I wanted. I finally said forget about preamp and focus on just getting the guitar signal to the output and see how that sounds. When I did a single triode directly into the PI with no EQ, nothing, it was AHA!!!! I got the clean sound I wanted. One thing that stuck out to me was the way a parallel triode worked and sounded. So I did that and again was happy. I played with plate and cathode values until I got the spank and gain I wanted, and then started going from there. When I went to dime the amp in order to see what it would do, yet again it was a surprise and with minimal amounts of tweaking, I was able to finally get an amp that would do a true clean, and go all the way to mean.
The amp you hear in the sound sample has probably over 50 hours of run time on it. I finished the build several months ago and I play it every few days, and I play it in several different ways from bedroom quiet to fully dimed. The goal is to find the weak link in the design. I can't get it to break, and it just sounds great no matter what I do. The power tubes still look new, no resistors look burned, I check the bias every now and then and there is no appreciable shift, and it hasn't skipped a beat! This amp is ready for me to build a headshell and send it to market. My prototype build, which I still have, is also still going strong with probably over 100 hours on it ( it is over two years old now ), and like this build, it has its thing that it does differently. It has no issues and it tells me every day to build another and another!!! The reason that this last build has not been sent to market yet is that there is another evolution in it that I wanted to be certain was not going to be an issue, call it a V2, if you will. I have another amp design on my bench that I need to 100% complete, as the prototype is done, but I have a couple of tweaks to make before I call it market-ready. This video series is not helping speed that up though... Anyway, stay tuned, more is coming.
Intro:
Part 1:
Part 2:
Part 4:
Sound Sample: https://drive.google.com/file/d/1F6y...ew?usp=sharing
The amp you hear in the sound sample has probably over 50 hours of run time on it. I finished the build several months ago and I play it every few days, and I play it in several different ways from bedroom quiet to fully dimed. The goal is to find the weak link in the design. I can't get it to break, and it just sounds great no matter what I do. The power tubes still look new, no resistors look burned, I check the bias every now and then and there is no appreciable shift, and it hasn't skipped a beat! This amp is ready for me to build a headshell and send it to market. My prototype build, which I still have, is also still going strong with probably over 100 hours on it ( it is over two years old now ), and like this build, it has its thing that it does differently. It has no issues and it tells me every day to build another and another!!! The reason that this last build has not been sent to market yet is that there is another evolution in it that I wanted to be certain was not going to be an issue, call it a V2, if you will. I have another amp design on my bench that I need to 100% complete, as the prototype is done, but I have a couple of tweaks to make before I call it market-ready. This video series is not helping speed that up though... Anyway, stay tuned, more is coming.
Intro:
Part 1:
Part 2:
Part 4:
Sound Sample: https://drive.google.com/file/d/1F6y...ew?usp=sharing
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