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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: Yet not another chip amp
PostPosted: 14 Feb 2017, 22:34 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
This amp was started years ago but originally didn't work as expected. Two chip amp Jaycar kits have replaced the amp modules and the heat sink and PS have been beefed up. NOW IT WORKS at long last. Listen now, only finished it an hour ago so lots of burn in time to go.
 
40W RMS into 8ohms with the normal chip amp protection all built in. Sounding clean, linear and uncluttered and bloody great bass - OMG! Nice WAF too.
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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
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PostPosted: 15 Feb 2017, 19:29 
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Nice work Mark. I like the big beefy PS caps. Which IC are you using?

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PostPosted: 15 Feb 2017, 19:39 
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Might add the tranni is a 300VAC job and there is a power filter. Two 8,000uf caps do the filtering and the bridge is rated 10A and well snubbed. Chip is the LM3876T.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 15 Feb 2017, 20:16 
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Joined: 04 Jun 2008, 20:59
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Hi Mark, I used the same chip in the project some years back (the Beast). Nice sound, not enough so that I'll turn in my tubes. But for cost and simplicity it can't be beat. I measured response from below 20 HZ to nearly 400K. I actually had to adjust it so it would not go so high as it was finding noise up there. Plenty powerful. It is still around here somewhere.

Good listening
Bruce

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PostPosted: 15 Feb 2017, 20:27 
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gofar99 wrote:
Hi Mark, I used the same chip in the project some years back (the Beast). Nice sound, not enough so that I'll turn in my tubes. But for cost and simplicity it can't be beat. I measured response from below 20 HZ to nearly 400K. I actually had to adjust it so it would not go so high as it was finding noise up there. Plenty powerful. It is still around here somewhere.

The kit I use is very well designed and has a lot of stabilising circuitry to top oscillation, runaway etc. close to the design on the specs sheet. Happy so far but my 6L6 SE UL will be back in service real soon.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 16 Feb 2017, 20:46 
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Don't 'tend to get all emotional over music these days but this amp got me twice. Once with Ian Shaw and once with Jane Monhiet (not sure of spelling). Great little amp, really draws you in. Feels real linear. But back on the 6L6 SE UL. Not sure but maybe the tuber has the edge.

That takes nothing from the chipper and it will play loud with no strain of compression.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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