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Old 23rd September 2004, 05:48 AM   #1
emil_86 is offline emil_86  Austria
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Post beginners ecl82 power supply

Hy!

Im going to build my second tube amplifier !!
But there's one problem :

I'm using this circuit (http://nmwilliam.tripod.com/ecl82.html) but
i have bought a power supply with ez80 tube that is supporting 247V !!

What Resistor i have to use to set the voltage down ??
Is it enough when i take 4 x 62kohm with 0,6W ??
Should i use capacitors ??

Thanks !!
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Old 23rd September 2004, 08:05 AM   #2
Luke is offline Luke  New Zealand
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Hi Emil,

Im not sure the answer to your question, but isnt it better to use a tube rectifier so as you dont get turn on thumps?


cheers luke
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Old 23rd September 2004, 08:41 AM   #3
Yvesm is offline Yvesm  France
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Default Re: beginners ecl82 power supply

Quote:
Originally posted by emil_86
Hy!

Im going to build my second tube amplifier !!
But there's one problem :

I'm using this circuit (http://nmwilliam.tripod.com/ecl82.html) but
i have bought a power supply with ez80 tube that is supporting 247V !!

Could you post the schema of your Power supply ?

Yves.
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Old 23rd September 2004, 08:56 AM   #4
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Default Re: beginners ecl82 power supply

Quote:
Originally posted by emil_86
i have bought a power supply with ez80 tube that is supporting 247V !!
There is a thread here on Morse's 6BM9 amp with a power supply voltage much closer to yours.

dave
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Old 23rd September 2004, 09:45 AM   #5
emil_86 is offline emil_86  Austria
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Here is it ! but i have messure the voltage and it is 247 Volt!!!
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Old 23rd September 2004, 12:44 PM   #6
Yvesm is offline Yvesm  France
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Quote:
Originally posted by emil_86
Here is it ! but i have messure the voltage and it is 247 Volt!!!
I don't doubt !
Wanted to have a look at the schemo before making any suggestion !

I can't see it here, is it the one drawn in the referenced link ?

Anyway, do you measure voltage with or without load ?
Each amp will probably consume some 30 to 40 mA.

Nevertheless, there is no risk to try, at least for few minutes, the time to take voltage while working.

Yves.
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Old 23rd September 2004, 03:46 PM   #7
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emil,

i built the same project, and my power supply is almost 300v.
I have tried using 240v (two identical transformer back to back) I didnt like the 'thin' sound i get. so i think yours is just fine.

If you really want to lower it, 1.5k resistor 25w to replace the (100R 5w) should do the trick.

But i think within <250v is fine. It runs hotter but it sounds richer
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Old 23rd September 2004, 04:46 PM   #8
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Morse's 6BM8/ECL82 thread

No bang, no flash, just music!

His has 240 V at the OPT

Click the image to open in full size.

dave
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Old 24th September 2004, 03:00 AM   #9
Luke is offline Luke  New Zealand
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I have some of these valves and wondering if I should build it with valve rectifier or diode? Doesnt the valve rectifier have no turn on thumps?

cheers luke
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Old 24th September 2004, 03:07 AM   #10
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Hi,

Quote:
Doesnt the valve rectifier have no turn on thumps?
Do other rectifiers cause turn-on thumps???

Quote:
I have some of these valves and wondering if I should build it with valve rectifier or diode?
How about a pair of each....?

Seriously, it's not the rectifiers that cause turn-on thumps...

Cheers,
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