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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: The Naked Amplifier
PostPosted: 22 Nov 2009, 03:28 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
Looking forward to a nice Dutch amp .... with Russian tubes.
Have fun!

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Magnus

“If you don't know where you are going, any road will get you there.”
―Lewis Carroll


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 Post subject: Re: The Naked Amplifier
PostPosted: 22 Nov 2009, 04:38 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Soundbrigade wrote:
Looking forward to a nice Dutch amp .... with Russian tubes.


I can imagine the accent it'll have :P

Cheers!

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* Ratings are for transistors - tubes have guidelines*
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 Post subject: Re: The Naked Amplifier
PostPosted: 22 Nov 2009, 12:53 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hallo everybody,

I live in Holland but I am German, so the accent of the "dutch" amp will be very understandable..... ;)

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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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 Post subject: Re: The Naked Amplifier
PostPosted: 27 May 2011, 11:04 
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Joined: 18 Oct 2010, 14:57
Posts: 1
Hi there,
Old post but did you ever get to build this amp?
I would like to build a 832a amp with a 6sj7/6sk7 or even a 6j7g as driver but can´t work out the schematics.
did you get around to build the 12sj7/832a?


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 Post subject: Re: The Naked Amplifier
PostPosted: 27 May 2011, 16:14 
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Joined: 05 Nov 2010, 21:07
Posts: 702
Location: South East US - Tennessee
Very interesting project.

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The key to a successful build is to keep the smoke IN the circuit.
-Les

We cannot solve our problems with the same thinking we used when we created them. - Albert Einstien
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LM380 Bridged Guitar Amp, Oatley K301 Phono Pre-amp, Oatley K272 Headphone Amp, Tube proto-board


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 Post subject: Re: The Naked Amplifier
PostPosted: 22 Apr 2013, 12:34 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
Dropped most of the ideas but have started another similar project using the 832, but will try to use ONE tube for two cahnnels in SE-mode.
Will look like this:
Image

Image

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Magnus

“If you don't know where you are going, any road will get you there.”
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 Post subject: Re: The Naked Amplifier
PostPosted: 23 Apr 2013, 17:43 
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Joined: 06 Jun 2008, 18:23
Posts: 5151
Location: Australia
Magnus: those power tubes do look strange. I see you found some top caps for them.

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Projects: "Precision" - 300W Class AB Holton power amp | "retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp |


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 Post subject: Re: The Naked Amplifier
PostPosted: 23 Apr 2013, 20:34 
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Joined: 06 Apr 2009, 10:08
Posts: 1596
Location: US Pacific Northwest
Soundbrigrade wrote:
... but have started another similar project using the 832, but will try to use ONE tube for two channels in SE-mode.
How exactly are you going to accomplish this? My 832 data shows a common cathode and a common screen grid between channels in each tube. I think this is why the 832 is referenced as a "Push-Pull" tube. Am I missing something?

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It's all about the Glass!
http://www.CascadeTubes.com
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 Post subject: Re: The Naked Amplifier
PostPosted: 24 Apr 2013, 00:13 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
Suncalc wrote:
Soundbrigrade wrote:
... but have started another similar project using the 832, but will try to use ONE tube for two channels in SE-mode.
How exactly are you going to accomplish this? My 832 data shows a common cathode and a common screen grid between channels in each tube. I think this is why the 832 is referenced as a "Push-Pull" tube. Am I missing something?

Wait, I get it now. If you ground the cathode, use fixed bias on the two separate control grids, and then fix the voltage on the screen grids this should work. I just had to think about it for a while.

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


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 Post subject: Re: The Naked Amplifier
PostPosted: 24 Apr 2013, 19:04 
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Joined: 06 Jun 2008, 18:23
Posts: 5151
Location: Australia
Suncalc wrote:
Suncalc wrote:
Soundbrigrade wrote:
... but have started another similar project using the 832, but will try to use ONE tube for two channels in SE-mode.
How exactly are you going to accomplish this? My 832 data shows a common cathode and a common screen grid between channels in each tube. I think this is why the 832 is referenced as a "Push-Pull" tube. Am I missing something?

Wait, I get it now. If you ground the cathode, use fixed bias on the two separate control grids, and then fix the voltage on the screen grids this should work. I just had to think about it for a while.

Don't forget, Decware share a common cathode resistor in one of their EL84 amps.

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Projects: "Precision" - 300W Class AB Holton power amp | "retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp |


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