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PostPosted: 27 Jun 2015, 08:25 
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Here it is fitted to my wooden case


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PostPosted: 27 Jun 2015, 08:33 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
And with the lid down?

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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 Jan 2016, 23:10 
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Joined: 15 Jan 2016, 22:41
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Hello, everyone. I am new here, but recently ordered this kit after reading the comments found on this forum thread.

I recently purchased ten JAN6418 tubes, and am assessing the practicality of a project for next Christmas.

My friend Pat does outstanding woodwork. I dabble in electronics, mostly special effects, timers, digital stuff. We collaborated this past Christmas on a 20-15 version of 'Shut the Box'. Fifteen copies of it.

Image

Next Christmas, I suggested a tube headphone amplifier mounted in a beautiful custom wooden enclosure of some sort. I would want to make at least ten units.

Pat likes that, but the target audience for our Christmas gifts are not wedded to the idea of headphones. Pat wants to know if this amp/preamp will drive a set of small speakers and for how long.

Failing that, I can get a voltage supply of 18v from a wall transformer. The idea is to place the voltage indicator LEDs behind the tubes and make them visible. A simple plug would permit the user to use their phone or MP3 player or whatever with the unit.

Would this work with the batteries? Or best to be externally powered, at least for the 18v supply? And does anyone have a suggestion for the speakers?

Thank you.

Cent13


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PostPosted: 16 Jan 2016, 18:42 
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The HP amp is not designed to drive speakers. Oatley put out a number of power amps with the JAN6418 tube upfront. The power amps are based on the chip amps and produce about 20W.

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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 Jan 2016, 22:30 
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Hmmm. Yeah, I see what you mean.

Well, how about this one? A bit different, but still seems to be about what I need.

Image[/URL]

Uses 6J1 tubes. Runs on 12v.

Regards,

Cent13


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PostPosted: 17 Jan 2016, 21:36 
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Still will not drive speakers, I don't think.

Got a link?

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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: 17 Jan 2016, 21:54 
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mwhouston wrote:
Still will not drive speakers, I don't think.

Got a link?


http://www.ebay.com/itm/131677563644?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT


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PostPosted: 17 Jan 2016, 21:57 
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Joined: 15 Jan 2016, 22:41
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Also... might not have made this clear, but we are going to feed this into a pair of powered computer speakers that have been removed from their original packaging and 'repurposed'. I think this should do the trick - planning to fix the gain on the powered speaker amp board so we get a nice uniform sound without too much craziness.

Cent13


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PostPosted: 18 Jan 2016, 01:56 
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For $17 should be OK and will work well with powered speakers.

What is the HT voltage?

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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: 19 Jan 2016, 01:34 
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Joined: 15 Jan 2016, 22:41
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mwhouston wrote:
For $17 should be OK and will work well with powered speakers.

What is the HT voltage?



What IS HT voltage?


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