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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: 05 Oct 2016, 18:48 
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The one from the bottom of the output transformer labeled B+272V means to connects to the HT of the PS which should be very close to 270V.

The input is where you connect your music source. Because this amp has an attenuator you can connect it directly to a music source which should have a voltage swing of about 1V.

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PostPosted: 05 Oct 2016, 21:37 
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Ok, so does this also mean that the rest of the points labeled B+272 are connected at the same spot, on the HT of the PS? Also Im going to assume that the wires coming into the schematic on the left side, running to the 6SN7 tube are coming from PS? What and where specifically on the schematic is the attenuator?
Sorry, if I frustrate anyone with these newbie questions. I'm just trying to make sure I'm understanding this 110%! Thanks in advance!


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PostPosted: 06 Oct 2016, 05:42 
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Without sounding condicending you are asking more than basic questions and it would be too easy for you to make some serious mistakes. My suggestion is to find someone with tube amp building experience to work with you.

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PostPosted: 14 Nov 2016, 22:33 
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Thanks so much for this thread. I’ve been searching for the last week to find a simple tube amp suitable for a 1st build. I think this is going to be it!

I’d like to start with an Edcor order since it’s going to take a while to get in. I want to make sure I’m ordering the correct parts.

Power:
http://www.edcorusa.com/xpwr163

Power Choke:
it was mentioned in the thread to use either a
CXC100-7H-150mA
http://www.edcorusa.com/cxc100-7h-150ma
or
CXC125-10H-200mA
http://www.edcorusa.com/cxc125-10h-200ma
Space is not a factor as I plan to make the amp a little larger than needed. Which one should I go with?


Output Transformers…
The schematic specs a GXSE10-8-5
Is that a GXSE10-5K with 8ohm Output impedance?
http://www.edcorusa.com/gxse10-5k

Thanks in advance for clearing up some noobie questions. I’m looking forward to combining my basic electronics knowledge with my woodworking skills to work on this project. I’ll have plenty of questions along the way 


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PostPosted: 15 Nov 2016, 17:43 
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NIckbee;

That's the power transformer I'd use.

If you are sticking buy the PS schematic and using two chokes, then I'd go with the 7H. It's more than enough with the second choke in place.

As for the outputs, yes that's the output transformer.

Let us know how your build goes.

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PostPosted: 10 Dec 2016, 21:11 
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For anyone interested, I am now rebuilding this amp using the results of my 6V6 optimization study (documented here). This means the amp will look the same from the outside, but the schematic is optimized for the best possible 6V6 SE-UL operation.

The thread for the rewire/rebuild is here: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5736

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PostPosted: 10 Dec 2016, 21:35 
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It will be interesting to see if you hear a difference.

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PostPosted: 20 Feb 2017, 18:33 
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I'm interested on build this amp. I know I will have many questions/doubts.

First question. Will this amp give nice full range sound no bass loss? I'm not bass adict but I need the bass sound correct, natural punch. I need smooth, mellow, warmth and clear sound at all frequencies with the caractheristcs of the true vaccum tube sound. I plan hear of all style of music, mainly Jazz, Reggae and old Rock and Blues

My speakers are Klipsch RF 82 II with 98db of sensibility. Some say these speakers can be fully drived by only 2w. Lately I'm using a solid state amp of 50w per channel. Do you think I will loss too much ?


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PostPosted: 20 Feb 2017, 20:04 
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I have built this amp but varied from the original PS buy splitting the PS at first cap (two stage filtering) to provide dual HT rails right through the amp. This amp sounds extremely good but if you are looking for deep punchy bass, 2W may not do it for you. Especially if you come from a higher powered SS amp.

What you will get is a real tube full bodied sound that is very seductive. You don't want seduction, don't build the amp.

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PostPosted: 21 Feb 2017, 11:26 
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mwhouston wrote:
I have built this amp but varied from the original PS buy splitting the PS at first cap (two stage filtering) to provide dual HT rails right through the amp. This amp sounds extremely good but if you are looking for deep punchy bass, 2W may not do it for you. Especially if you come from a higher powered SS amp.

What you will get is a real tube full bodied sound that is very seductive. You don't want seduction, don't build the amp.


I tested a single-ended 6550 amp (with preamp 12ax7 section, driver section i don't remember now) and it was more powerfull than my solid amp. I was impressed. I think it was around 10w.

Im nott looking for big/punch bass, but right bass reproduction like I described. I love the tube feel.


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