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beamnet 7th September 2005 02:56 PM

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)

TheGatesOfFate 7th September 2005 05:12 PM

Change the 220R with choke.


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?


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 :


beamnet 9th September 2005 08:46 AM

Don't know the dc current, they are from

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


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!

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