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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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 Post subject: 6111 sub-mini Tube Amp
PostPosted: 19 Feb 2009, 00:49 
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Joined: 03 Aug 2008, 20:22
Posts: 386
Location: Denver, Colorado
Hi all,
After making a trip to Rat Shack , I thought of putting this tiny tube amp together.
It is a 6111 sub mini dual triode, I am using a 12vac wallwart to a RS 12.6 300mA(back to back) for 126v B+ after pi filtering. The heater is 6.0 from a dc battery, in hindsight i should have run two tubesin paralell with series hearters to use the ac voltage from the wallwart.
The sound is pretty darn good, but more of a novelty than anything. If I was to guess it puts out about between +2~5 db more than line. So in essence it is a line amp of sorts but I have some 600ohm cans so It works out well. I really need to get outside more. :D

The red light is LED biasing peeking through the headphone jack.

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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 07:11 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
Wow that is tiny.


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 11:29 
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Joined: 02 Sep 2008, 14:34
Posts: 514
Location: Rochester, NY
Rogers,

I love it! Great Job.

alan

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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 13:40 
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Joined: 28 May 2008, 21:53
Posts: 4285
Location: Winnipeg, CANADA
billnchristy wrote:
Wow that is tiny.

How do we know that his hands are not HUGE? :)

Yeah, I love it too, but I hate working with tiny enclosures. Nice work.

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 16:08 
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Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
Yea, really though, I thought my mini preamp was small, this is just intense. :P

I've always wanted to make something that small using tubes, I really want to make a portable headphone amp of that size but the HV is a problem when using a battery.

I challenge you to make a portable headphone amp using this tube! :ugeek:

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My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 16:34 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
Maybe this would do it:

http://www.lh-electric.4t.com/vtps6.htm


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 17:46 
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Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
Ok that is cool, it can provide up to 25mA at 150V from 12V supply!!! :up:

Too bad there isn't a schematic I could use to build one :(

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My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 20:04 
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Joined: 03 Aug 2008, 20:22
Posts: 386
Location: Denver, Colorado
This is a road that many have been down. Pete Millett has accomplished this but at a $1k pricetag. For the above card, research Dc to DC converter. I was able to make a CMOY amp that works on usb power 5 bumped to 15 then split for 7v dual rails.
The only issue with portable tube idea is heater current. The battery will have to be humongous.

The closest i got was the BIC, which used a 6088 sub mini and run from a 1.5 v 20ma direct heated cathode but the HV was an issue. DC to DC converters have an oscillator and that sound can bleed into the rails.

I will revisit, there has to be some circuits in medical electronics for portable units.

Rogers


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 19 Feb 2009, 20:10 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
http://www.lh-electric.4t.com/projects/ ... 20SMPS.pdf

:P


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 Post subject: Re: 6111 sub-mini amp
PostPosted: 03 Mar 2009, 03:51 
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Joined: 02 Mar 2009, 12:41
Posts: 805
Location: Vänersborg, Sweden
Submin tubes or pencil tubes are really fun. Inspired by the Kolibri and Zwerg amps (http://www.roehrentechnik.de/html/mini-verstarker.html) I started to build a simple SE-amp using a 5902 as OP tube. Transformer is a 100V line transformer; not 100% correct as it is supposed to work with AC-signals only.
However the prototype I built for one channel worked fine but when I assembled the lot, I had either arranged a short or a bad solder or something as it didn't play ... :confused:

Here's the working prototype:
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And this is the "beginning of the end". I installed the lot in a watch box. The toroid came from Frag Jan Zuerst, tubes from all over (Frag Jan, AES ...) and transformers from Conrad (a German hobbyshop):

Image

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