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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 16 Dec 2018, 14:01

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PostPosted: 14 Sep 2018, 03:07 
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Joined: 09 Aug 2018, 03:15
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Location: Forsbacka Sweden
And now some testing. Its alive! :up: 144V on both channels. Heaters also working good with just a little voltage drop below 6V. Just tested music with my telephone in and it works, a little low output perhaps (phone is maybe not a good driver)... will try later direct drive with my Rega DAC. Will come back with my thoughts soon. Absolutely no hum :D


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PostPosted: 14 Sep 2018, 04:24 
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Joined: 17 Mar 2016, 07:26
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Location: Prêles, Switzerland
ForsbackaKalle wrote:
And now some testing. Its alive! :up: 144V on both channels. Heaters also working good with just a little voltage drop below 6V. Just tested music with my telephone in and it works, a little low output perhaps (phone is maybe not a good driver)... will try later direct drive with my Rega DAC. Will come back with my thoughts soon. Absolutely no hum :D

Hello Kalle?

same issue with my phone's output. In fact, a smartphone output is no line output. As you say, a DAC or CD will provide much greater voltage. The amp can provide a lot of power on its output, if you provide appropriate input levels. Clipping is far away, you will be deaf before clipping.
Charles


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PostPosted: 18 Sep 2018, 02:47 
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Yes, this headphone amp rock. Works great with my Rega DAC and absolutly no hum. And the power is also more than needed. Used with Sennheiser HD600 and DIY streamer with Raspberry pi, HiFiBerry Digi + Pro and a decent power supply using Volumio. :headphones: : headphones:


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PostPosted: 18 Nov 2018, 10:51 
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Joined: 15 Nov 2018, 19:43
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Location: Belgium
Hi folks.

After having discounted tube projects as too hard or complex for ages, I finally decided to actually commit to one, this one, and have ordered the transformers. I wanted something that could add to my FiiO E10K that's been my desktop DAC/amp for a while now, and this looked like both a nice entry into tube projects, as well as a somewhat budget upgrade to my audio gear.
Now as a first in probably a long line of questions: How inadvisable would exposed tubes be when there's a desktop PC sitting a few feet away from the amp. As much as I like the visuals offered by a nice glowing vacuum tube, I have the feeling they'd pick up a fair bit of noise from all the HF signals in a PC?

Greetings

Geoff


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PostPosted: 01 Dec 2018, 17:09 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
HI, I have been travelling and didn't see this question. The tubes in this design can be exposed. The gain is small and the tubes generally not sensitive to direct EMI or vibration. Just keep them away from AC power transformers as that would tend to couple hum into the circuit which would certainly be audible. A CRT monitor might also cause problems.

Good listening
Bruce

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PostPosted: 01 Dec 2018, 17:28 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
Nim wrote:
How inadvisable would exposed tubes be when there's a desktop PC sitting a few feet away from the amp. As much as I like the visuals offered by a nice glowing vacuum tube, I have the feeling they'd pick up a fair bit of noise from all the HF signals in a PC?
Just for reference, I had my build (the one pictured below) by my computer.
Attachment:
6DJ8_front.jpg
It was sitting on my desk at work for over a year. It was about 18" from my laptop computer dock and within two feet of dual widescreen 26" monitors. There was also florescent lighting directly over my desk.

I never experienced any noise or interference from either my work computer or the lighting.


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PostPosted: 01 Dec 2018, 18:06 
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Joined: 09 Oct 2012, 19:43
Posts: 318
Location: Vancouver Canada
I see not only does the 6EM7 have it's own personality,,,,,, it has a "mini me". Beautiful work Matt.


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PostPosted: 04 Dec 2018, 18:06 
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Joined: 15 Nov 2018, 19:43
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Location: Belgium
Thanks for the replies! Managed to get the transformers so far, which came in pretty fast considering I'm in the EU. I hope to be able to tinker away around Christmas


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