Newbie question - You mentioned in your wrap-up that you thought the output transformers were the reason for the low wattage, and talked about scaling up to the 15 watt model and seeing if it got you a few more watts. With 10 watts potential on the output transformers, why is final output not at least a little higher? My brain wants to jump to the conclusion that if you're not getting 10 watts out of a 10 watt transformer with adequate power from the PSU the issue must be a lack of gain or something else on the input side. Or is it just general inefficiency of the tubes, etc? If it's gain would expanding the design to a parallel output tube configuration help get more out of the OTs? Or is moving up to a larger transformer the only option for more power in this particular design? It would be awesome to see 5+ Wpc. Would scaling up either the number of tubes or the wattage of the OTs be pretty straightforward or would the overall architecture of the amp need to be upgraded? Thanks!
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Fixed and available
BOM uploaded, I never made one and spend several hours this morning making one for y'all. https://www.skunkiedesigns.com/6bm8-amp
I’m looking for the 6BM8 BOM as well. Anyone have one?
Oops. I meant 1615A. Clumsy fingers. I didn't realize it was a different style. Glad I asked. Thank you.
1516A? I see a 1615A but that's a push pull OT.
Thanks for this. You weren't kidding on the wait times for those Edcor OTs. They're over 3.months now. I see the Hammond 1516A is available from several places at a notably higher price but similar specs - 15w UL 5k/8ohm, 40% screen, 30-30khz, and a slightly smaller footprint. Do you have an opinion on these as an alternative?
The larger OT is to help the low end/bass response. It won't make more power. If I was going to "add tubes" I would build it as a push pull design, which would totally change everything.
Also, the BOM spreadsheet is missing on the 6BM8 project page. Would love to have a copy of that.