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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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It is currently 21 Apr 2021, 07:03

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 02 Apr 2020, 11:01 
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Joined: 13 May 2016, 02:02
Posts: 152
Location: Javea, Spain
Suncalc wrote:
I don't think that this is anything about which you should be worried. But it has made the Engineer in me curious.

Okay. Back in the case it goes. I'm going to use it and just not look at the ammeters when I turn it off.
Thanks to all for your help.
Hope you find the cause and a remedy Matt.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 12 Feb 2021, 13:32 
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Joined: 14 Feb 2020, 14:31
Posts: 3
Good Afternoon, I built the 4S Universal PreAmp last year and love it. Now I’d like to add another SE amp next to my 807 amp. I have the PT,OT and Chokes on hand in stock and Have a question. The Marblewood amp uses the 5u4gb the Lacewood is using the 6CA4. I have the Hammond PT and want to use a 5V4G. I’ve printed out both Power Schematics and made the changes. I’d like to know if this looks good or do I need changes.


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 12 Feb 2021, 16:29 
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Joined: 14 Feb 2020, 14:31
Posts: 3
I already have built the 4S Universal amp and love it, I am looking to build this amp (Lacewood)or(Marblewood) I already had the OT's from another project and the Hammond Pt as well. I know there are a couple of revisions of this amp and my plan is to use the 12A*7 the Preamp. I already and have chassis started, painted and such. This is what I was planning on using for the PT section, I am no electrical engineer but I do have a few hifi and guitar based builds already. I am hoping this would work, its a little from Lacewood and Marblewood amp


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 14 Feb 2021, 22:28 
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Joined: 06 Jun 2008, 18:23
Posts: 5335
Location: Australia
lego4040 wrote:
I already have built the 4S Universal amp and love it, I am looking to build this amp (Lacewood)or(Marblewood) I already had the OT's from another project and the Hammond Pt as well. I know there are a couple of revisions of this amp and my plan is to use the 12A*7 the Preamp. I already and have chassis started, painted and such. This is what I was planning on using for the PT section, I am no electrical engineer but I do have a few hifi and guitar based builds already. I am hoping this would work, its a little from Lacewood and Marblewood amp

Love the colour. Good see builders making the effort and taking the time.

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Projects: | “La Ruse” - tube SRPP ECC83 preamp | "Noir” - Psvane tube preamp | ”fiih-300” - 300W Holton based amp | "Sortilege" - 180W Tripath Class D Mundorf upgrade amp |


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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 16 Feb 2021, 13:27 
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Joined: 14 Feb 2020, 14:31
Posts: 3
You should’ve seen what that chassis looked like when it came off the wall. It used to be a phone box for FireWarden phone. Lots of body work to get that straight


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