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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: 19 Mar 2009, 20:49 
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Joined: 20 Jan 2009, 20:31
Posts: 33
Location: Canandaigua NY
I'm back. Been down in the shop for ever so long. The speaker project required some serious tooling upgrades.

I canceled the full range Fostex 126E enclosures for now and bought the Recession Buster kit from Madisound.
Attachment:
recession-buster.pdf
Attachment:
rb-kit main.jpg
Attachment:
rb-kit hookup.jpg

I decided on a 3/4 plywood cabinet with 3/4 MDF motorboard and backboard. After cleaning all the junk out of the basement, rebuilding the tablesaw, buying a new router, outfitting with quality bits, buying clamps, new saw blades, a quick-clamp cutting guide, a circle cutting jig, building a workbench suitable to the project, building a stereo cabinet so I could listen to music in the shop while building the speakers, a few squares, a couple more clamps, more lights, a new book on routers, building a few jigs to keep everything sort of square, practicing on a couple of boxes out of scrap and a pair of cheap Pioneer drivers, and signing up for therapy, I got started a few days ago.

Image

Image

Those flared ports sure are big.


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PostPosted: 19 Mar 2009, 21:04 
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Joined: 20 Jan 2009, 20:31
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Location: Canandaigua NY
The motorboards are now painted flat black. I raided the wife's quilting supplies for batten or whatever they call it to use for damping material. Everything should be wired up and functional tomorrow if I can find the right size quick connects in this one-horse town. If you don't hear from me by Friday, it's because I screwed up the wiring and then I've thrown myself from the roof. Send condolences to to my wife, Booangler knows the address.


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PostPosted: 19 Mar 2009, 22:10 
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Joined: 28 May 2008, 21:53
Posts: 4214
Location: Winnipeg, CANADA
Great stuff. Those kits looks like a fantastic deal. We will be interested in knowing how they sound.

Therapy goes good with this hobby! ;)

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 20 Mar 2009, 22:18 
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Joined: 20 Jan 2009, 20:31
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Location: Canandaigua NY
Wow.

Worth building, twice over. A far better system than I thought I was building in the first place.


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PostPosted: 22 Mar 2009, 20:11 
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Joined: 20 Jan 2009, 20:31
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Location: Canandaigua NY
They sound best without damping material. I thought I'd try it though the main school of thought seems to be that damping is unnecessary in a vented enclosure of this size. With light damping, that is, a double layer of quilt batting or however you spell it, they sound a bit puny.

Without damping, very lively, competent, with well-defined bass, definitely a class act.

The driver terminals are probably metric dimension, rather delicate, and if you'd rather not solder be careful using the crimp-on female disconnects. The 14-18 gauge .187 size worked best for me after I tightened down the clamps just a bit with a pair of pliers.

It turns out the crossover pack, at 5" x 3", would fit right across the back board between the port and the input cup, except my bracing got in the way of it and I didn't feel like cutting away. The crossover PCB is not all surface mount, so it requires standoffs. I used #6 machine screws through a block of MDF, put nuts and washers down, then slipped the PCB over that and tightened down another four nuts, so the first set of nuts were my standoffs. Then I mounted the block to the bottom of the cab. Next pair I'll modify the bracing and just run the screws through the backboard and mount the crossovers there.


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PostPosted: 23 Mar 2009, 12:04 
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Location: Winnipeg, CANADA
Good to hear that they sound great. $60 is a great price.
Cheers

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[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 23 Mar 2009, 22:32 
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Joined: 20 Jan 2009, 20:31
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Location: Canandaigua NY
Not a very good pic, sorry. Got to check my camera settings.

That's an old Utah from the late Sixties it's perched on there. Got to open those up one of these days.


Image


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PostPosted: 23 Mar 2009, 22:38 
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Joined: 20 Jan 2009, 20:31
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Location: Canandaigua NY
The less-than-elegant crossover mounting contraption shown here. Those nuts will act as the standoffs.

Image

Crossover in place. I could only use three of the mounting screws. I missed the fourth by 1/32 or so, it was enough.

Image

Braces are oak. I need to try something else on the next pair.


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PostPosted: 24 Mar 2009, 00:23 
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I see you finished speakers. What is finish?

Do the crossover boards come prefabricated?

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[ DIY Mains AC Power Cable Cord ] - [ K-12 Tube Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 24 Mar 2009, 06:41 
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Joined: 06 Jun 2008, 20:12
Posts: 946
Location: Houston, TX
You could make money selling speaker enclosures. Those are really nicely done!
So whats wrong with the Oak?
Ri

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