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Old 27th December 2011, 07:34 PM   #121
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Quote:
I'm sorry I don't understand your question
it s good to laugh ............sometimes:
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Old 28th December 2011, 04:35 AM   #122
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I may have found an home for a 45VAC 13A toroid I saved from the trash !!!

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Old 30th December 2011, 10:21 AM   #123
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Just received as a New Year nice " gift " .
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Old 30th December 2011, 12:26 PM   #124
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Shiny.

Happy New Year!
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Old 30th December 2011, 12:27 PM   #125
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Default Silly Question....

Hi Michael!

Some misconception for my part - I have found 120volt - 150Watt bulb(both internett & E-bay), but I started wondering: do we need 2pc 120Volt/300 watt i paralell per channel: That means we have 600Watt pr channel = 1200Watt pr. LÀmp? I have mine Alpair 10.2 in SelfMadeFonken which is Nominal= 6,1 ohm. So i have to keep down to around 8-10 ohm and 600Watt(bulbs + eventually resistors in combination) on each channel. Or can I keep it to around 10 ohm AND 300watt???

When I read the DeLite thread I think I saw 2 bulbs and each was 150 watt.

Hope you can give a clue to a somewhat novice in North Europe(Norway) - well been into electronic most of my life....

PS.

Mine 2SK82 KD33 arrived in the post Yesterday - Hurrah!!
So before I get the rest of the gear, heat sinks, trafoo and such...will be a project in the course of the spring!

Many thanks and blessed be to ye all in the New Year.

Olav
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Old 30th December 2011, 12:50 PM   #126
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Hello Olav,

You're looking for around 10-13 Ohms. One 300W@120V bulb measures approx. 22 Ohms, so two in parallel are 11 Ohms. So, you need two 300W bulbs per channel.

You can use any combination of bulbs that gets you to 10-13 Ohms, or use a resistor.

BTW, a 6 Ohm, 87 dB speaker is really not going to be a good match for an amp like this.

8-16 Ohms, High Efficiency.

Last edited by Michael Rothacher; 30th December 2011 at 12:54 PM.
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Old 31st December 2011, 12:27 AM   #127
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So, I have a reading comprehension type question. Great article by the way.

So, your bulbs drop a lot of voltage, along the lines of 25-40V. If you had a CCS which required a lot less voltage to operate then you could get away with a lot less B+ voltage. If I understand your table correctly, you only need 13.6V to 15.3V plus whatever it takes for the CCS to operate?

Now where did I put that old AudioXpress article...
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Old 31st December 2011, 06:27 AM   #128
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how to build or by a CCS with 3amp output ?
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Old 31st December 2011, 01:45 PM   #129
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how to build or by a CCS with 3amp output ?
You may have a look into the Zen variations #9 where you can find a 2amp example.

http://www.firstwatt.com/pdf/art_zv9.pdf

Franz
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Old 31st December 2011, 02:09 PM   #130
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Originally Posted by Franz Gysi View Post
You may have a look into the Zen variations #9 where you can find a 2amp example.

http://www.firstwatt.com/pdf/art_zv9.pdf

Franz
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