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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: 15 May 2013, 05:54 
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nicinico: Watch up. Due to the photoelectric effect, the blue light will knock off extra non-musical electrons from the cathode and cause a lot of BLN - Blue Light Noise. Use yellow LEDS instead as YLN is smoother for the ears. And stay away from white LEDs!!!!!


YLN - Yellow Light Noise.
The photoelectric effect was found by Einstein and was the reason for his Nobel Prize in 1995 (I think). He did not get his (first?) prize for the revelation theorem.

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PostPosted: 15 May 2013, 06:31 
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Wow! Thanks for the info.

So replacing the Blue LED to Amber is the right choice.


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PostPosted: 15 May 2013, 09:34 
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nicinico wrote:
Wow! Thanks for the info.

So replacing the Blue LED to Amber is the right choice.

Ambers is the way. Send an image when done.

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Projects:"retro2308" - chip based headphone amp | ”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp


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PostPosted: 15 May 2013, 09:37 
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Better still, send a printout from your digital oscilliscope.

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PostPosted: 16 May 2013, 02:19 
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Now in Amber...

Front
Image

Back
Image

@Soundbrigade

Sorry Sir, I don't have an oscilloscope.


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PostPosted: 16 May 2013, 02:24 
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nicinico: That looks great. Definitely inspiring.

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PostPosted: 16 May 2013, 09:52 
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Much better. I can even hear it when I am scrolling down this page that the sound is much better.

To be honest, amps and speakers etc, may not sound better IF the design is better or the colors or frills and bells and whistles are there (or not there), but we do certainly have another way to look at a unit that does look tidy and have an attractive appearance than something that doesn't even look like a prototype.

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PostPosted: 30 May 2013, 11:34 
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Hi Everyone! So I'm a first timer trying something like this.... I have the K272C kit and got it all together last night and tried to fire it up, but I didn't get anything... no led's and no sound. I'm pretty sure I have everything soldered in the correct orientation at least, but my soldering skills may be suspect. I did check to make sure that my batteries were good, but beyond that I'm not sure where to start checking. So I was looking for suggestions on where to start...

A few pictures, if it will help any....

http://hurtsdoughnut.net/media/504/WP_20130530_006.jpg
http://hurtsdoughnut.net/media/509/WP_20130530_007.jpg
http://hurtsdoughnut.net/media/494/WP_20130530_004.jpg
http://hurtsdoughnut.net/media/489/WP_20130530_003.jpg

Thanks for the help, I appreciate it!


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PostPosted: 30 May 2013, 17:41 
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Show some photos with the batteries connected. Have you got the batteries the right way. And check the transistor is in the right way. I have assembled many of these and it's hard to make a mistake.

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PostPosted: 30 May 2013, 17:46 
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And that actually may be my problem... being the newbie that I am, I assumed that the 2 aa's were all it needed, but after looking at it more it looks like I need to run 2 9v's in series and feed it 18v?


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