power supply issues

beamnet · 7th September 2005, 02:56 PM

here's the deal:

i have an ecl86 amp

It has regulated supply for the triode section

The pentode section has not

the power supply is now:

tube rect, c, r, c, where it splits to r,c for the pentode section and goest to the regulator for the triode section.

I have a bunch of 1,6 H 124 ohm chokes.

where would they benefit the ps?

can i change the last r of the pentode section with a choke? I know the first one could...

any thoughts

(the values are 240V~, ez81, 100uF,220 Ohm, 100Uf, 100Ohm, 2x47uF parallel)

TheGatesOfFate · 7th September 2005, 05:12 PM

Change the 220R with choke.

cheers.

beamnet · 7th September 2005, 05:23 PM

the 100r resistors not?

i simulated and i get enough voltage

the question is, can chokes be so near to the final supply?

Bas

have' · 8th September 2005, 10:52 AM

You can try on the place of the 100R, only if they are big enoug (I dc current )

Take a look here :

http://www.dhtrob.com/projecten/voeding_9_chokes.htm

beamnet · 9th September 2005, 08:46 AM

Don't know the dc current, they are from www.baco-army-goods.nl

what goes wrong if they arent big enough?

they are so cheap (E0,70) smoking them wouldn't make me cry

Eli Duttman · 9th September 2005, 10:27 AM

beamnet,

If you have the room, use 4 of those chokes. Wire them in series/parallel to yield a net inductance/resistance = to that of a single choke, with 2X the current handling capability.

It's not a problem to have the choke(s) close to the power trafo, IF you orient the lamination stacks perpendicular to each other.

beamnet · 9th September 2005, 11:47 AM

ok, i have tons of room. I might be able to fit in about 20! But then i could have better bought a descent choke. The thing works fine without, just want to see if E2,80 can really boost the performance.

Is there a way to check power handling? i guess max power is when the core saturates?

that must be measurable with a signal generator and a scope i suspect?

thanks a bunch for thinking with me!

7th September 2005, 02:56 PM	#1
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	power supply issues here's the deal: i have an ecl86 amp It has regulated supply for the triode section The pentode section has not the power supply is now: tube rect, c, r, c, where it splits to r,c for the pentode section and goest to the regulator for the triode section. I have a bunch of 1,6 H 124 ohm chokes. where would they benefit the ps? can i change the last r of the pentode section with a choke? I know the first one could... any thoughts (the values are 240V~, ez81, 100uF,220 Ohm, 100Uf, 100Ohm, 2x47uF parallel)

7th September 2005, 05:12 PM	#2
TheGatesOfFate diyAudio Member Join Date: Jul 2004 Location: Monterubbiano(AP) - Italy	Change the 220R with choke. cheers. __________________ ...if a man desire to laugh, must be ready also to cry.

9th September 2005, 10:27 AM	#6
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	beamnet, If you have the room, use 4 of those chokes. Wire them in series/parallel to yield a net inductance/resistance = to that of a single choke, with 2X the current handling capability. It's not a problem to have the choke(s) close to the power trafo, IF you orient the lamination stacks perpendicular to each other. __________________ Eli D.

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7th September 2005, 05:23 PM	#3
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	the 100r resistors not? i simulated and i get enough voltage the question is, can chokes be so near to the final supply? Bas

8th September 2005, 10:52 AM	#4
have' diyAudio Member Join Date: Apr 2005 Location: pmr	You can try on the place of the 100R, only if they are big enoug (I dc current ) Take a look here : http://www.dhtrob.com/projecten/voeding_9_chokes.htm

9th September 2005, 08:46 AM	#5
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	Don't know the dc current, they are from www.baco-army-goods.nl what goes wrong if they arent big enough? they are so cheap (E0,70) smoking them wouldn't make me cry

9th September 2005, 11:47 AM	#7
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	ok, i have tons of room. I might be able to fit in about 20! But then i could have better bought a descent choke. The thing works fine without, just want to see if E2,80 can really boost the performance. Is there a way to check power handling? i guess max power is when the core saturates? that must be measurable with a signal generator and a scope i suspect? thanks a bunch for thinking with me!

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