DIY Audio Projects Forum
http://diyaudioprojects.com/Forum/

"Lacewood" Amp V2.0
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5736
Page 15 of 19

Author:  lowhifi [ 18 Nov 2017, 21:42 ]
Post subject:  Re: "Lacewood" Amp V2.0

"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

Author:  Suncalc [ 19 Nov 2017, 14:49 ]
Post subject:  Re: "Lacewood" Amp V2.0

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.

Author:  mwhouston [ 19 Nov 2017, 17:11 ]
Post subject:  Re: "Lacewood" Amp V2.0

Looks like a good start. I like the inserts at the front. A much better way to go.

Author:  john55 [ 09 Dec 2017, 13:13 ]
Post subject:  Re: "Lacewood" Amp V2.0

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.

Author:  Suncalc [ 09 Dec 2017, 17:44 ]
Post subject:  Re: "Lacewood" Amp V2.0

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.

Author:  john55 [ 10 Jan 2018, 06:18 ]
Post subject:  Re: "Lacewood" Amp V2.0

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.

Author:  Suncalc [ 11 Jan 2018, 21:36 ]
Post subject:  Re: "Lacewood" Amp V2.0

WOW! Beautiful work!

Author:  TIJ-NIKI [ 12 Jan 2018, 02:58 ]
Post subject:  Re: "Lacewood" Amp V2.0

At first i thought they were UV meters, now i see they are ammeters. Damn awesome build

Author:  Gio [ 12 Jan 2018, 21:58 ]
Post subject:  Re: "Lacewood" Amp V2.0

Fantastic build John55. I love all of the copper.

Author:  NW2K [ 15 Jan 2018, 14:14 ]
Post subject:  Re: "Lacewood" Amp V2.0

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.

Page 15 of 19 All times are UTC - 6 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/