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jessie.dazzle wrote:

While reading of your progress on the 6 channel amp, I was thinking ahead, and how I might approach the building of such amps as separate projects for each frequency band (separated physically as well). In my particular case, this would be in the interest of keeping things simple, but also to leave the ML2s to run the rest of the system while building/evolving the new amps. The idea being to remove the ML2s one frequency band at a time, and compare one addition (one frequency band) at a time against the ML2s.

Well, I understand what you are trying to do but I see some problems with this approach. I the way how you approach it you will not have optimized paths for input stage and very much might end up with 6 input cables. Alternately it might be done as 6 plug-in sections, using high quietly Tektronix knife-connectors… If so then the PS and everything else should be packaged with plug-in objectives.

If I have an aim to build an unknown DSET for myself then, knowing what I know now, I would chose for following approach:

1) Build one prototype of full-range SET channel, powering it from any old good lab power supply. If you do not have it then get on eBay for $200-$300

2) Deeside for yourself if the amplifier is worth pursue and delivers the results that I would like to see (sound, power, gain, measurements, stability, operation, parts etc…)

3) Built a power supply for whole DSET, calculating the power for 6 channels (with 30%-50% spare power) and use multiple taps (100%, 110%, 120%, 130%, and 140% on primary for plate transformers, enabling me to add channels to this supply. Do not under-estimate the thoughts about the PS to amp interface – it is VERY important decision.

4) Convert the built full-range channel into a first DSET for upperbass/lover-Mid channel powering it from the DSET power supply.

5) Order the output transformers for the rest channels and having thier dimensions begin to think how the whole DSET will be package chassis/chassiss – wise, fitters-wise, layout-wise etc…

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