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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: 05 Nov 2008, 15:21 
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Joined: 22 Oct 2008, 07:37
Posts: 26
Bill,

Doublecheck your C5 and C6, the values in the guide do not correspond with the diagram/outline printed on the board - I think. If you notice, mine is opposite yours.

I will also doublecheck the values when I get home...

Carl


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PostPosted: 05 Nov 2008, 17:05 
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Joined: 26 Aug 2008, 20:57
Posts: 415
Location: Atlanta
Should be fine either way really

My C5 is .68uf
My C6 is .33uf


C5 should be .33-4uf
C6 .1-1uf


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PostPosted: 14 Nov 2008, 13:47 
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Joined: 22 Oct 2008, 07:37
Posts: 26
Here is my thinking of integrating the phono stage into the preamp all in one chassis. The phono stage will be point to point wiring. The separate heater xformer is 3A. The 5687's will draw .45A a piece and the 6CG7's will draw .6A a piece for a total of 2.1. The 6DJ8's will draw another .365 a piece for a grand total of 2.83A.

The PT at 125mA will have pleanty of power for all the tubes as well - Aikido = 42mA, phono = 44mA.

Anyone have any experience with the RJM phono stage? Pretty decent reviews from what I have seen.

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PostPosted: 14 Nov 2008, 19:56 
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Joined: 28 May 2008, 21:53
Posts: 4264
Location: Winnipeg, CANADA
I have not tried it, but like you, I have read good things. I like the 6DJ8 tube.

Have you got the Aikido Preamp going?

Cheers

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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 Nov 2008, 20:03 
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Joined: 22 Oct 2008, 07:37
Posts: 26
Not yet...still waiting on the Edcor Iron...probably another couple weeks...plus I still need to decide on a chassis. Debating all metal enclosure VS wood frame and metal plate top/bottom OR metal plate front, back, top, and bottom with wood sides...

The last is the way I am leaning but most costly...I like the idea of keeping some wood in the design to keep the family look with the simple se...

I cant wait to at least get it fired up in a test rig. The wait is killing me!!!


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PostPosted: 12 Aug 2009, 06:48 
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Joined: 22 Oct 2008, 07:37
Posts: 26
OK,

Finally wrapped up the build!!! Actually got to listen to it for a little while last night. I ended up abandoning the idea of integrating the phono preamp - that will be a separate project.

I ended up with the Edcor XPWR106, a ratshack 12.6V filament xformer, and used Bas' PSU board that I found on that other DIY site.

I will post pics later today!!! The little I listened last night it sounded pretty good and very quiet.


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PostPosted: 12 Aug 2009, 17:52 
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Joined: 22 Oct 2008, 07:37
Posts: 26
Here are some pics...finally...

Image
Image
Image


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PostPosted: 12 Aug 2009, 18:00 
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Joined: 08 Aug 2009, 03:11
Posts: 1380
Location: Chilliwack, BC
Hey, that power board looks familiar ;)

Lookin' great! :up:

Cheers!

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 13 Aug 2009, 18:10 
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Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
oooooooooo, that look nice!!! 8-) wood chassis is the way to go!

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


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PostPosted: 13 Aug 2009, 21:59 
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Joined: 22 Oct 2008, 07:37
Posts: 26
The preamp runs to a Tubelab SimpleSE...The system is very quiet...Speakers are my old college Polk Audio M4.5's - pretty effecient little bookshelves...pleanty loud for the living room...

Once it is broken in I'll peel the plastic off the plate and stain/varnish the base to match the power amp...

Next up is the separate Phono stage...the board is stuffed and the aikido psu has another B+ to tap into...I also have a spare filament xformer so it will be a small little unit...probably 6x10...

Thanks for the comments!!
Carl


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