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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 Mar 2018, 08:27 
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Joined: 19 May 2011, 05:38
Posts: 28
A must have if Harbor Freight is near: https://www.harborfreight.com/180-piece ... 67582.html


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 19 Mar 2018, 13:06 
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Joined: 06 Jun 2008, 18:23
Posts: 4944
Location: Australia
Suncalc wrote:
These are much cheeper, but I don't know if the shipping would make them expensive for you as well.
https://www.tubesandmore.com/products/grommet-rubber-chassis


I generally don't bother but over-drill my holes to allow some wiggle room. Not only wiggle room for the wires but just aligning trannies and wires etc. Also I ensure all is burr free. With the top plate being earthed should any mains or HT connect it should take out the fuse.

A practice I have employed since my first tube amp is half width rubber grommets under power trannies, chokes and OPTs to help isolate any vibrations. The power trannies under load can buzz a bit. Mounting them on split grommets helps stop that vibration getting to the tubes etc. a simple and cheap practice. If you place your finger lightly on a power trannies usually a small vibration can be felt. Not good for tubes big or small. It also helps with any mechanical noise from the amp which the top plate may act as a sounding board.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 19 Mar 2018, 13:08 
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Joined: 06 Jun 2008, 18:23
Posts: 4944
Location: Australia
P.S. I like the baby blue too. My next HP amp, on a dark wood base, will have a deep blue top plate. Just to get away from too much black.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 22 Apr 2018, 18:16 
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Joined: 03 Jan 2017, 20:59
Posts: 24
I start the build of a second Lacewood but James audio stop their production so i need an alternative.

Lundahl transformers seems nice, the LL1663 may suit my needs at 8 ohm.

http://www.lundahl.se/wp-content/upload ... s/1663.pdf

What do you think.

Regards.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 22 Apr 2018, 18:57 
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Joined: 20 Feb 2014, 10:35
Posts: 51
Location: NZ
Yes, such a shame James Audio have stopped production of their transformers.
I have used the LL1663, and these a very good. Depending where you are, Thomas Mayer http://vinylsavor.blogspot.com has good prices on Lundahl products. Another good option is Electra-Print in the USA http://www.electra-print.com/transformers.php.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 26 Apr 2018, 17:49 
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Joined: 03 Jan 2017, 20:59
Posts: 24
I am living in Canada, so not very much options locally. Hammond no, maybe Plitron.

And what about the expensive japanese transformers,not at 4000$ but maybe 2000$

Also i will use my two Lacewood amp in a bi-amp setup. I already James JS6135-HSF so maybe the new ones can be chosen accordingly for higher or lower frequencies.

All my drivers are 8 ohm and i cut at 700hz.

Regards


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 05 Jun 2018, 14:45 
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Joined: 03 Jan 2017, 20:59
Posts: 24
A Lundahl distributor in France ask me for the steady current "courant de repos" 50 mA he think, is that correct.
For LL1663 the price is Ok but i saw on Ebay large 2kg open frame c core UL transformers with no name for the same price. :confused:


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 05 Jun 2018, 19:25 
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Joined: 06 Apr 2009, 10:08
Posts: 1460
Location: US Pacific Northwest
lowhifi wrote:
A Lundahl distributor in France ask me for the steady current "courant de repos" 50 mA he think, is that correct.
In the Lacewood V2.0 the total transformer current (plate plus screen) is ≈43mA with a B+ of 300V.

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It's all about the Glass!
http://www.CascadeTubes.com
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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 05 Jun 2018, 21:05 
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Joined: 03 Jan 2017, 20:59
Posts: 24
Thanks a lot.

But the LL1663 SE come in two versions. 50 mA/35H or 100 mA/17H

What will be the difference in the circuit.

Best regards.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 05 Jun 2018, 22:45 
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Joined: 06 Apr 2009, 10:08
Posts: 1460
Location: US Pacific Northwest
lowhifi wrote:
What will be the difference in the circuit.
The circuit should stay the same.

However, the low frequency response will be much better with the 50mA transformer due to the higher primary inductance.

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Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


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