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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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PostPosted: 22 Aug 2011, 22:19 
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Joined: 14 Nov 2008, 10:48
Posts: 45
It's me again. I purchased a pair of Tympany 2" drivers from parts express for $5 a piece.
Here are the specs.
Specifications: *Power handling: 10 watts RMS/20 watts max *VCdia: 13/16" *Le: 0.12 mH *Impedance: 8 ohms *Re: 7.1 ohms *Frequency response: 148-20,000 Hz *Fs: 148 Hz *SPL: 83.7 dB 1W/1m *Vas: 0.008 cu. ft. *Qms: 3.4 *Qes: 0.54 *Qts: 0.46 *Xmax: 1.45 mm *Dimensions: A: 2-5/8", B: 2", C: 1-3/8".

Based on some of the reviews, folks have been getting good results mounting this to the end of a 2 foot pvc pipe.... But I would like something a bit more aesthetically pleasing than that. I was looking into possibly building a mass loaded transmission line box for them and thus keeping up with the quarter wave pipe theory that seems to work well... but I honestly don't know anything about how to calculate what dimensions everything should be. Any thoughts would be appreciated. Thanks


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PostPosted: 23 Aug 2011, 19:23 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
For MLTL speakers, check out Martin's site: http://www.quarter-wave.com/

Cheers

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PostPosted: 03 Sep 2011, 17:29 
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Any reason this wouldn't work?
Box is 13 x 3.5 x 4 inches
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PostPosted: 06 Sep 2011, 11:56 
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I built them as per the plans. They sound OK. They play pretty low, maybe 120Hz, but they have no punch. Also they seem a bit shouty, probably easily fixed with a bsc. Sound best from about 10 feet away, so they won't work for desktop monitors, but would work well just to have some noise in the garage or something. All in all, not bad for $10.
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PostPosted: 07 Sep 2011, 12:08 
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Location: Winnipeg, CANADA
Fs is about 150Hz so about 120Hz ain't bad. Mate them up with a sub and you are off!

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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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PostPosted: 14 Oct 2011, 09:28 
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Joined: 14 Nov 2008, 10:48
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I painted them and mated them up with a little altec lansing sub/amp for a PC 2.1 system. It is nice for the speakers as it cuts them off at about 100hz. However the sub is a bit boomy. I'll probably steal the amp section out of it and build my own sub. Quick question though.The amp doesn't have a volume knob so I have to control the volume with the source. While this works OK, It would be handy to have a physical knob. Can I just put in a potentiometer inline between the source and amp?


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PostPosted: 14 Oct 2011, 14:14 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
You should be able to put a pot between sourse and sub amp. As long as the signal level is low and any current draw very low. 10K pot should work. I must say they are the smallest loaded speakers I have ever seen.

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Projects: "Parley" - Tube preamp with Pass B1 buffer | "VoXConcentriC" - Beyma high efficiency 12" speakers | "Black Lace" - all Ozzie tube 6V6 Power amp - old school
Website: [ retro-thermionic ]


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PostPosted: 25 Feb 2012, 20:03 
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Joined: 19 Feb 2012, 15:25
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Location: Virginia Beach
I also ordered some small tang bang speakers (3") full range. I will be building a box similar to these. I am just setting them up in the garage, so not to picky about the sound input. $20 for a pair can beat it for a beat around set. I'll post up some picks when I finish. :up:

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PoddWatt with Belden 83803 Mains Power Cable Cord driving Klipsch B-20s and Polk Audio PSW111 Sub,Boozhound phono preamp, Sony TT.


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