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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 26 Sep 2011, 00:05 
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diablo007 wrote:
Does it have to be wired in the manner in the drawing?
Nope. Just get 6.3Vac to each heater and you'll be good to go.

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PostPosted: 26 Sep 2011, 01:26 
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Yes place the 1uf cap across the heater pins (4 and 5 for the 12AX7) for the to amp tubes. DO NOT put the cap on the rectifier heater only the amp tubes.

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PostPosted: 26 Sep 2011, 12:31 
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Noticed I accidentally undid my corrections to the power circuit. I've corrected that.

I do have a question that I remembered while correcting that. Grounds now tie into the neutral correct? Except for the earth ground of course, that ties into metal on the chassis :D


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PostPosted: 26 Sep 2011, 18:25 
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Actually the Champ I built was the 5F1. They look very simular though.

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PostPosted: 26 Sep 2011, 18:55 
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Quote:
Actually the Champ I built was the 5F1. They look very simular though.


I've been searching to see what people felt about the 5E1 vs. the 5F1. Seems it's mostly a personal preference. I also read about someone installing a DPDT switch to that they could switch from resistor (5F1) to choke (5E1). Though it seems to me you'd also have to disconnect C5 also. Something to think about.

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PostPosted: 26 Sep 2011, 19:10 
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I made mine choke filtered and also Pentode in the output stage. I had an OPT with the 40% tap. I added a switch to allow me to switch to Triode mode. Also between first and second stage I added an external effects loop.

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PostPosted: 26 Sep 2011, 19:42 
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Quote:
I made mine choke filtered and also Pentode in the output stage. I had an OPT with the 40% tap. I added a switch to allow me to switch to Triode mode. Also between first and second stage I added an external effects loop.


Googled the difference between pentode and triode, I understand the basics now.

What is an 'OPT with the 40% tap'. I'm guessing the last part just means that you have the option of inserting your effects between the amp and preamp instead of before the guitar.

Did you get a chance to double check my schematic?

Thanks to everyone for all your help and input :thumbsup:

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PostPosted: 26 Sep 2011, 20:19 
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OPT is output transformer and for pentodes the primary has a tapping 40% on the primary which connects to the screen grid of the 6V6. This provides a little negative feed back (NFB) to the tube.

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PostPosted: 27 Sep 2011, 18:24 
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I do have a question that I remembered while correcting that. Grounds now tie into the neutral correct? Except for the earth ground of course, that ties into metal on the chassis


an interesting question, and one i still don't have a clear answer to also. i believe that the earth (or ground from the AC) 110/240v goes to the 'metal' and the DC ground is 'isolated' from this but is common across all DC grounds within the circuit (with the exception of some heater wiring)

something for your consideration also ; http://www.ozvalveamps.org/ava100/ava100project.htm this is a very interesting (and simple)

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PostPosted: 27 Sep 2011, 18:41 
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Most of the time I connect mains earth and PS negative all together and ground it to the metal case work. Only on one of the last phono preamps did I isolate the mains earth and PS earth.

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