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In Reply to: RE: Questions posted by xcortes on June 05, 2007 at 11:07:49
Question I:Sure, you can do anthing you want with the parts. We won't be able to offer any detailed support about what you would need to change to make the kit work in other applications, so it will probably be worth it to study the articles on shunt regulation in the July 1999 issue of Tube CAD journal and the original C4S manual. Most parts in the kit would stay the same for different applications, except for most of the resistors supplied in the kit and perhaps the shunt regulator bypass capacitor whose value is selected depending upon the regulated voltage chosen. In the case of a direct coupled shunt regulated amp where voltages can get pretty high you need to keep the voltage limit of 375V across the MJE5731A in mind.
Question II:
The MJE5731A can handle 2 watts maximum dissipation without a heatsink. Any more than that and an appropriate heat sink needs to be used. You would need to calculate the current and voltage across the MJE5731As to determine the power dissipation in a different application. In the case of the SR45 the MJE5731A that is in the C4S load on top of the shunt regulator is dissipating about 3W and hence modest heat sinks will be included with the kit.
Edits: 06/05/07
I like this approach as it gets back to the basics and promotes learning. Hopefully the instructions would include some theory on how the resistors etc. were sized, limitations of the parts etc. so that adapting the upgrade kit to other incarnations of the Paramour can be readily figured out by an advanced self-taught amateur. Something along the lines of the original C4S manual. As much fun as this mod sounds, I am not ready myself to jump right in as the Paramours are my current main amplifiers and I fear that my current 92-93 dB speakers (Triangle Celius 202) might sound a bit anemic with 45 tubes. Now if I could get my hands on a pair of Lamhorns (I am about as likely to convince my wife of the wisdom of such a purchase as I would be convincing her of the wisdom of buying a Porsche).... When I do build new main amps this mod kit will probably follow shortly thereafter though.
The instructions will be a photo and a schematic. Writing a bunch of general instructions for how hybrid shunt regs work and how to adapt the board for a lot of different uses would take even more time than shooting the photos and writing step by step instructions. But all is not lost as discussion of the theory and working up solutions for the few who want to modify the circuit is exactly what the forum is supposed to be for. The tools are in place to save us all time and money, waiting to be taken advantage of.
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