Take the basic Sugden chassis concept in post 1, take the heatsinks and in each 'trough' between the fins, drill a row of 3-4mm dia holes maybe 20mm apart through the base of the heatsink (I have access to a CNC mill to make this a bit more sensible a job). Thanks for your input, I was thinking about this earlier the whole compact heating issue and yes I would rather avoid fans, maybe I'm a snob, maybe I see it as 'cheating' maybe I should give them a chance. Thanks again for the thoughts, keep em coming. My rough chassis design is looking like 0.4-0.45 deg c/W of cooling available per channel (250x150x40mm deep finned heatsink) Is this in the ball park for a 15-20w class A? looking at the ALPHA somewhere in the box of bits in the loft have an old Scythe ninja heatsink which would look cool hanging out of a build (its bloomin massive), not what I want to do here though. I want something fairly compact, but quality hence I'm using the Sugden Bijou for inspiration, If I could fine their music master at sensible money I'd probably just buy one and I'm still considering the headmaster pre amp to run all this from (as it just uses a regular ALPS motor driven volume and simple relay source switching, all that control is on separate PCBs and ripe to be hacked into what I need). It has to be a properly WAF approved system, so no bare MDF speakers, no massive Krell KSA50 clones with exposed mains for the children to lick when I'm no looking, nothing that requires 4 different remotes to operate (pre-amp will be needed to switch between the RPi streamer and tv, and have control volume all off the existing samsung TV remote). This thread is about making something to properly eclipse both the TPA and A60 for my home listening. You assume I'm happy with the 3116, it makes a pleasant noise at my office desk, but I wouldn't use it at home (my old A&R A60 is nicer now I've re-capped it). ![]() Which Pass, there are so many, hence me asking on here The ALPHA look interesting, I need a shortlist to properly go through the threads of each, a 280+ page thread is a bit daunting when you look and find at lease a dozen suitable candidates on here for builds to research. ![]() I have a half built Greg Ball SKA150 somewhere, but not seen it since moving house. I'm not afraid of a more complex build, my assembly abilities are pretty good (I'm certified for space flight hardware assembly). My speakers are well into the 80s dB so despite not wanting a lot of power I think 10-15w would be needed rather than 5w. Could make for a very cheap (mostly scavenged) amp for my desk at work. So I might build one anyway if I can find a suitable heatsink kicking around, I know I have 19v laptop PSUs courtesy of the WEEE bin. The ACA looks interesting, I'm concerned 5w will not be enough, but its so simple looking and I like the use of SMPS, it strikes me as an intelligent design cutting all the right corners. This is what I'm building in the style of (hopefully): So there are the JLH amps, various Pass amps, Rod Elliots stuff etc etc, where on earth do you start? I want a foot print of 250x280mm (ish), im happy to build it quite tall (4-5U is no problem). I listen at home at low levels so I do not need reference level power, and my speakers are small mini monitors (troels Graavessen Seas w15 and fountek ribbons). ![]() I want to build a nice small footprint power amp, I'd quite like something small and class-a (no real logic to this decision so feel free to try and sway me) ![]() RPi based streamer with Allo BOSS DAC (currntly running this into an old A&R A60)ĭIY Stereo headphone amp or Sugden Headmaster if I can find one (3ip pre-amp) So I'd like to build up something akin to the Sugden Bijou system: I want to step up my diy audio game, I've done nothing for the past 10 years apart from a bit of car audio and stuff prebuilt boards in to enclosures on rare occasions (currently listening to an ebay TPA3116 board in an ebay DOUK aluminium enclosure).
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