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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 18 Nov 2017, 21:42 
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Joined: 03 Jan 2017, 20:59
Posts: 23
"I am working with a new amp, we'll call it the "6V6 Marblewood", that uses four separate filters sections for the two power and two signal stages."

Oh no, not an other version to build :blush:

I already buy the caps, the resistors and the two little chokes for a second Lacewood but not the transformers yet.

My idea was to have two identical but i will see.

The enclosure is partly done, i use the last piece for angico wood i had.

André


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 19 Nov 2017, 14:49 
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Joined: 06 Apr 2009, 10:08
Posts: 1446
Location: US Pacific Northwest
lowhifi wrote:
Oh no, not an other version to build
Yes. But this one is a little different. The driver is a 4S Universal type circuit so that builders can switch the driver tube to get the sensitivity and tone they like. And as I said before, the power supply is different. Even the rectifier, a 6CA4 on this build.

Here are the pieces:
Attachment:
Marblewood_Kit.jpg
The chassis is one built out of a little piece of Marblewood i picked up at my hardwood supplier. I talked about it on my blog here. I had all the materials in hand and the metal all cut and drilled in May when I learned about being transferred to a new location for work. I haven't had a chance to assemble it yet. When I do, I'll start a thread for the new design.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 19 Nov 2017, 17:11 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Looks like a good start. I like the inserts at the front. A much better way to go.

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 09 Dec 2017, 13:13 
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Joined: 13 May 2016, 02:02
Posts: 91
Location: Javea, Spain
Hi All,
I'm building a second Lacewood V.2 at the moment for my brother in law. He would like a set of ammeters included in the build. I have a pair of 0-100mA meters available and would like to know if I can connect them to the ground side of the cathode bias resistors on the 6V6s. The bypass caps would still go from the cathodes directly to ground. This is how I fitted them in the 6EM7 vertical amp I built following Matts' advice. If there's no problem and I can fit them, what readings should I expect on the meters? I would appreciate any input as my math isn't up to working that out..YET.
Thanks in advance.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 09 Dec 2017, 17:44 
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Location: US Pacific Northwest
john55 wrote:
... would like to know if I can connect them to the ground side of the cathode bias resistors on the 6V6s. The bypass caps would still go from the cathodes directly to ground.
This will work fine. They should read between 45mA and 50mA. Let us know how it goes.

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 10 Jan 2018, 06:18 
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Joined: 13 May 2016, 02:02
Posts: 91
Location: Javea, Spain
Thanks for the quick reply Matt, I've wired them in and they work fine.
Over the past year or so I've built a complete stand alone system with four distinct, independent parts to the system.

FLAC files on remote harddrive + Raspberry Pi + Hifiberry proplus DAC with two independent regulated 5 volt supplies and Rune Audio OS as a stand alone media player.

Fostex plate amp driving 4.5 inch subwoofer

4S Pre-amp with Psvane 12AT7.

Lacewood V.2. Driving Fostex FE126En drivers in bass reflex/backloaded horn, hybrid cabinets.

I just love this setup, I can sit and listen for hours and find no fault with it. The other thing I love is I can interchange everything easily with other equipment.

After having a long listen to the system, my brother-in-law asked if I would build him one. I quite happily said “yes”. MY MISTAKE, he's a neatness freak. Firstly...can he have everything in one cabinet? Secondly...can he have it looking a bit Steampunky? and Thirdly...can he have blue lights on it?
As he's buying all the bits I had no choice but to say yes to everything, although I really argued over the blue lights.
All in all, it was good fun to build and my worries about noise with everything together in one chassis proved groundless.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 11 Jan 2018, 21:36 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
WOW! Beautiful work!

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 12 Jan 2018, 02:58 
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Joined: 29 Mar 2013, 20:37
Posts: 129
Location: Italy
At first i thought they were UV meters, now i see they are ammeters. Damn awesome build


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 12 Jan 2018, 21:58 
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Joined: 28 May 2008, 21:53
Posts: 4559
Location: Winnipeg, CANADA
Fantastic build John55. I love all of the copper.

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 15 Jan 2018, 14:14 
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Joined: 15 Jan 2018, 13:41
Posts: 1
Location: Springwater, NY
Matt, thank you very much.

Metal 6J5/6V6 prototype is operational, just waiting for Edcor output transformers. The quantitative relationship between the fundamental and second and third harmonics looks just like the figure on Matt's website. At 1W, the second harmonic is -34db and the third is below -40db.

Packaging will be utilitarian; just enough to be reasonably safe in the lab. Thank you.


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