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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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PostPosted: 12 Dec 2018, 12:45 
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Joined: 13 May 2016, 02:02
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Location: Javea, Spain
I built some Fostex back loaded horns to go with the first 6EM7 I built. I also built some Fostex bass reflex speakers at the same time. If you're interested go to this link.... https://www.theleathershop.biz/class-a- ... ifier.html It's the website for my leather shop in Spain, but I used a couple of pages to put up the project for my friends in England to see. Both sets of speakers sounded really nice with the 6EM7. Also plenty of volume.


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PostPosted: 12 Dec 2018, 16:22 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
A better choice, after working with both, is the Markaudio 12P which is both inexpensive , better souding (more bass if you build thier deeper bass) and no shrillness.

https://www.madisoundspeakerstore.com/a ... ull-range/

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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PostPosted: 12 Jan 2019, 13:37 
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Joined: 13 May 2016, 02:02
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Location: Javea, Spain
As mentioned on the previous page, I want to build the 6EM7 as a pair of monoblocks with half of Matts' revised line stage, tone stack preamp in each one. I will use half a 12AU7 for the buffer and half a 12AT7 to gain back the 20 dB (and a bit more) lost in the tone stack.
The boxes are built from Iroko and are ready to be oiled. The top plates are cut to size. I've come up with a layout I like, but would like some input before I start drilling. I would like to have the input and output on the back of each monoblock, but they will be close to the rectifier valve. I think STP cable for the input? Do I need to shield the output? The three €1 coins show where the bass, treble and volume would be. The second monoblock would be a mirror of the first. The PS transformer is pretty close to the output transformer, is that a problem? Any advice would be great.


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PostPosted: 12 Jan 2019, 13:52 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
john55 wrote:
I will use half a 12AU7 for the buffer and half a 12AT7 to gain back the 20 dB (and a bit more) lost in the tone stack.
So why not just use the other half of the 12AU7 as the amplifier? This saves a tube and gets you a gain neutral tone stack and buffer. The 6EM7 amplifier itself is already very sensitive. I would think that gain wouldn't be a problem.

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PostPosted: 13 Jan 2019, 02:50 
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Joined: 13 May 2016, 02:02
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Location: Javea, Spain
john55 wrote:

I used your circuit (two channels) in front of a lacewood V2 and loved it. So I intend to build a one channel version on each monoblock using half a 12AU7 for a gain stage and half as a buffer. I won't bother with a defeat switch this time as I never use it.

As you can see, that was the original idea, but I won't be able to "tube roll". For me, the 12AT7 isn't about gain, I just like the sound of it. Mind you, I could just be kidding myself as it was quite an expensive 12AT7 and I'd have to buy another one. I may just fit an extra valve base "in case", and at this stage take your advice and go for the one valve.


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