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PostPosted: 19 Nov 2009, 15:26 
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Joined: 22 Oct 2009, 18:24
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Location: N. Carolina, USA
What is the secondary output voltage and current rating for the B+? I'm playing around with an idea in my head before I order the kit.


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PostPosted: 19 Nov 2009, 17:52 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, The B+ is just under 250 volts and the current needs to be at least 300ma for good operation.

I would avoid going higher on the B+ as you can easily exceed the 6005s dissipation and cook them.

Good listening
Bruce

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PostPosted: 19 Nov 2009, 17:57 
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Joined: 02 Sep 2008, 14:34
Posts: 527
Location: Rochester, NY
atwageman wrote:
What is the secondary output voltage and current rating for the B+? I'm playing around with an idea in my head before I order the kit.
Have you read the reviews of this kit? Not very many nice things being said about it. You may want to look at K- 502 or the S5 12G. These are the more tried and true versions. There is also the soon to be released Tubelab.com Simple PP (scroll down to get the the Simple PP). You can find all kinds of posts from George over at DIYAUDIO.COM. He is well liked and well respected and here is a link the Simple PP thread.

Cheers, Alan

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Denon POA 2200 | Bottlehead Quickie with PJCCS | Integra CDC 3.1 | SOTA Sapphire-RG301-Grado Gold 1 | Soundwave Soliloquy Series I


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PostPosted: 20 Nov 2009, 00:59 
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Location: Winnipeg, CANADA
Hi atwageman, here is a scan of the K-16LS tube amp schematic which was recently posted.

Hi Alan, subjective reviews of the K16 have been pretty mixed. I think I have seen more positive than bad reviews now.

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 20 Nov 2009, 06:56 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
I am Ben from Holland and I have the kit. I love it and it was also me who posted the scope results. Well I am pretty new to all of this so I hope the information you will get from me will help. I just recently went into tubes, asking Bruce and Gio all kinds of stupid questions. Both of them where nice enough to answer all of them patiently. Thanks guys.

The kit sounds very very good as is. I decided to make my first project out of it and duplicate it with some modifications and wire it point to point.

First of all, the output transformer has about 180 VAC secondary and center tapped 6.3 volts for the filaments. Yesterday I ordered an output transformer with the following specs:

Primär: 230V

Sekundär: 2 x 0 - 170V - 230V, 0,3A
6,3V, 3,2A
6,3V, 2,5A
5V, 2A (für GZ34 Heizung)
100V, 0,05A (für eventuelle neg. Gittervorspannung)

I will get it in a couple of weeks. I also have two output transformers from Edcor with 40 % ultra linear tap and 8 Ohm secondary coming, in about 3 weeks.

I already got all the tubes and sockets, so that is something.

Just a few minutes ago I got the raw casings from the local carpenter, who has fun making them for me, and I like what he did so far. I will post pics in a minute.

It's been weeks since I decided to start on that project and it has been very challenging to chase all the parts from Holland, but now it seems like I get it together, I am exited, especially since this is my first real project. I will also post a better version of the schematic, after I photoshop it for a while ;)


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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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PostPosted: 21 Nov 2009, 19:19 
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Joined: 28 Oct 2009, 02:34
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Location: Utrecht Nederland
here are the specs from the original transformers from that kit as information is provided from S 5. I hope that helps.

Output Transformer
Ratio 35 : 1
Primary Resistance 400 ohms
Secondary Impedance 8 ohms
Power 10 watts

Power Transformer
120 / 220 VAC in
180VAC @ 250 mA Secondary #1
6.0 VAC @ 5.5 A Center Tapped Secondary #2

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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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PostPosted: 24 Nov 2009, 17:10 
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Joined: 22 Oct 2009, 18:24
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Location: N. Carolina, USA
Yes that helps a lot. Thanks.


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PostPosted: 24 Nov 2009, 22:49 
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Location: Winnipeg, CANADA
The primary impedance for the audio output transformer is not correct. Perhaps it should be 4k instead of 400 ohm?

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PostPosted: 01 Dec 2009, 10:29 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hallo everybody,

the information on the output transformers is as provided from S5, I did not make an mistake posting it. After thoughts with Gio we figured that this info maybe wrong and it should be round 4k. Well wrong, too. The impedance is the real ohm resistance measured with a multimeter. What the real impedance on the stock transformers is, I have no idea. They work good enough on my kit, though.

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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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