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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 Feb 2020, 05:24

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 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 08 Jan 2020, 17:23 
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Joined: 06 Jun 2008, 18:23
Posts: 5174
Location: Australia
john55 wrote:
My wife turned up with a 1947 Marconiphone radio the other day. She thought I might want to try to get it working.
I don't have much interest or knowledge in radio but decided to give it a look over. I managed to salvage the little mono amp that I can play with later, but as for the receiver..... I didn't have a chance (I don't know about the USA but here in Spain I don't think anyone broadcasts on SW / MW / LW anyway).
Then I looked at the case, dull brown bakelite but not a scatch or crack on it anywhere. A bit of soapy water and dasboard polish and look what I've got.
This is going to house the 6V6 and tone stack that I've been asking questions about in the last two or three posts on this thread. It might be a bit of a squash but I've got height as well as width and depth. Any thoughts?

Looks good.

Projects:”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp | ”Gothic” - FET Push-Pull headphone amp

 Post subject: Re: "Lacewood" Amp V2.0
PostPosted: 13 Jan 2020, 12:22 

Joined: 13 May 2016, 02:02
Posts: 133
Location: Javea, Spain
This chassis is a bit tight to fit everything, but that's all I've got if I want it to fit in the Marconiphone case.
I've kept the two 12AU7's and the 6SN7 as far away from the mains transformer as possible. Are they far enough away or am I asking for problems?
I would prefer to keep the 32uF+32uF capacitor on the top plate if possible but could move it underneath if the heat from the 5U4GB and the 6V6 on either side of it would cause problems. Asking for advice here as I have read that capacitors don't like heat.

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