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In Reply to: RE: Latest hifimediy Tripath T4 amp module posted by mwhouston on September 01, 2016 at 19:36:24
There are a fair number of conventional solid-state amplifiers I've seen with the bridge right on the caps like this; sometimes they use copper plates instead of wire on the really large amplifiers.
Does the bridge get hot? I'll bet it doesn't. You are not running this amplifier long term at high RMS power levels, your speakers don't require that. A big peak here, a big peak there maybe. And since these class-D amps are very efficient, you really are not pulling much current through there on average. On demand, yes, but not much the time.
Follow Ups:
With 15" concentric Beymas at 99db efficient my 1920s tube power amp (Intermezzo) with its 330mW, plays at good listening levels. So I guess I'm pulling less than 2W (lately playing louder) from an amp capable of delivering 160W! The bridge should stay cold.
Same for my 250W Digikey amp - barely idling. I'm finding this may be the best combo;- very high efficiency BIG concentric drivers in big boxes, powerful, fast amps and high res audio from dedicated music severs. But I could be wrong.
| retro-thermionic |
Bleed resistors could be a better fittment than those 'bypass' caps.
Which even if one acribes to the bypass theory..seem a strange choice,
5 cent mylars on Uber priced Mundorfs ?
Out of simple curiousity: Where/Who mfg'd that 'Tripath' chip ?
As Tripath dissapeared over 10 years ago.
Edits: 09/02/16
Putting the polies on filter caps, across diodes and rec bridges and across audio caps is something I have always done. I have read in a number articles how it is good practice and I don't believe they have to be over expensive items.
Should I get to see the bottom of another T4 board I post the chip name. Tripath licenced thier technologies to other chip makers so some chips could aspire to the Tripath design.
One thing I have noticed with Tripath Class Ds (or Class T) is as the load increases the wattage drops. With most Class Ds the bigger the load the bigger the wattage output. Hifimediy make a 4ohm load version called the T2 which is designed for 4ohm loads. This is the give-away that the module is a genuine Tripath. Part of the Tripath design is where they take the feed back point. I understand most Class Ds take the FB from the analogue stage at the end. Tripath moved the FB stage to the switching area. Supposedly better sound by better FB design.
| retro-thermionic |
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