burnedfingers wrote:Well, you can gain quite a bit by changing to a add on power supply board. I realize that your board has increased capacitance but additional capacitance is needed in order to make the Dynaco perform even better. In the past I owned one of Bob's boards as a matter of fact it was the first Dynaco I put together. While its a good board to be honest there are better performers out there. I will point out that I have not tried Shannons boards but I have tried Geeks boards.
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Bob, I didn't say that any additional power would be made by the addition of the Triode power supply board. I didn't claim any difference in measurable distortion. I didn't claim any specific capacitance size either. The VTA as you politely pointed out with the upgrade has a total of 464 mfd. The Triode the way I put them together has 506mfd in the following order 41,195,135, and 135 and I will point out the capacitors are in series to increase the voltage rating so there are two 82's, two 390's, two 270's, and two 270's. This raises the first cap rating to 800 vdc and the rest to 500vdc. In addition I use only 105c rated caps. This point alone I push to people wanting to upgrade their 70 instead of replacing the weak link multi cap that you parallel several sections in. You seem to favor and push the russian coupling caps and I won't argue that point and by the same token I suggest what I feel is a superior cap upgrade. The Power supply board provides everything in one specific spot and yes I realize that you use your own bias circuit and that portion of the power supply board simply isn't needed when using your board.
Hey the guy seems to be happy with what he has and good for him. I simply suggested an upgrade. To me the upgrade is a way to eliminate the problematic multisection capacitor that has a proven faulty track record. While you seem to have done some work trying to provide a viable well performing product the addition of the power supply board is simply a better way to go. Yes, I also have several distortion analyzers and all the necessary equipment to make any and all performance tests necessary in order to achieve a maximal effect. Contrary to what you might believe I actually owned several of the dynaco 70's with your VTA driver board. One had the power supply board from Triode and the other was setup with your 464 mfd supply with the ganged multicap. Bob, I also have two sets of Klipsch Cornwall clones and two identical Aikido line stages in other words a nice little setup in which to do an A/B test. Out of 5 people that did my A/B test all favored the Triode supplied power supply board. Bob, I always buy two and or make two of everything and this rules out any possibility of an unfair test and I do this with every board I'm interested in.
I would be more than happy to discuss this further on my Dynaco2forum board and you don't have to worry because your not banned there unlike myself on your board.