beginners ecl82 power supply

emil_86 · 23rd September 2004, 05:48 AM

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 !!

Luke · 23rd September 2004, 08:05 AM

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

Yvesm · 23rd September 2004, 08:41 AM

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.

planet10 · 23rd September 2004, 08:56 AM

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

emil_86 · 23rd September 2004, 09:45 AM

Here is it ! but i have messure the voltage and it is 247 Volt!!!

Yvesm · 23rd September 2004, 12:44 PM

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.

skyraider · 23rd September 2004, 03:46 PM

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

planet10 · 23rd September 2004, 04:46 PM

Morse's 6BM8/ECL82 thread

No bang, no flash, just music!

His has 240 V at the OPT

dave

Luke · 24th September 2004, 03:00 AM

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

fdegrove · 24th September 2004, 03:07 AM

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,

23rd September 2004, 05:48 AM	#1
emil_86 diyAudio Member Join Date: Sep 2004 Location: vienna	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 !!

23rd September 2004, 04:46 PM	#8
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Morse's 6BM8/ECL82 thread No bang, no flash, just music! His has 240 V at the OPT dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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23rd September 2004, 08:05 AM	#2
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	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

23rd September 2004, 03:46 PM	#7
skyraider diyAudio Member Join Date: Jan 2004 Location: malaysia	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

24th September 2004, 03:00 AM	#9
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	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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