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Old 19th January 2017, 03:37 PM   #21
oks81 is offline oks81  Norway
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The obvious answer to make it better is bigger chokes.
These are what I think would do the job a little better:
-Hammond 159ZC 60mH
-Hammond 193U 200mH
-Hammond 193V 150mH
-Lundahl LL2733 100mH
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Old 19th January 2017, 03:42 PM   #22
eduard is offline eduard  Netherlands
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Hello,
I think the lundahl would be the best because they are constructed the same way like their anode chokes.greetings, eduard
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Old 19th January 2017, 04:52 PM   #23
oks81 is offline oks81  Norway
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Ok
I have no idea myself..

Just reading Pass tried with 1H aircoil...
I dont think I have space for that beside putting the choke outside...
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Old 20th January 2017, 07:09 AM   #24
oks81 is offline oks81  Norway
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Any of you know how to position the chokes if they have to stand close to eacother?
Thinking if have to serial connect chokes to get more mH and space in enclosure is not to good....
Hammond is EI core (I think..)
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Old 20th January 2017, 07:49 AM   #25
eduard is offline eduard  Netherlands
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Hello,
Ll2733 is 400mH with the 2coils in series. The lundahls chokes are not very sensitive to fields in their surroundings nor do they radiate a lot themselves. Greetings, eduard
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Old 20th January 2017, 12:01 PM   #26
oks81 is offline oks81  Norway
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But then get DCr=3,4ohm and 1,7A current...
No free lunch..

I know you like the Lundahls eduard, and thanks for recommending!
See they are C-core.
Do C-core have less field then EI-Core?

Maybe should have asked in the tube section as its more used there...
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Old 21st January 2017, 09:35 AM   #27
woody is offline woody
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If you shop carefully on Ebay you can get a 10lb spool of 16 gage magnet wire for about $100 including shipping. The spools these are sold on will work ok! as an inductor having a dcr of ~ 4.5 ohms and ~ 100mh. But if you rewound that wire on a shorter coil form you could get a higher inductance -- just a quick look and it looks like that 10lbs of wire on a 2" core and 2" long will give you just a little over 150mh . But it will have less radiating area so may run a little hotter. So all in all just leaving it on the spool might not be such a bad idea afer all.
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Old 22nd January 2017, 01:47 PM   #28
oks81 is offline oks81  Norway
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Good idea
But thinking those spools are a bit big...

Looking at Hammond 193V, it cost 79USD at digikey.
And it`s 150mH and 1ohm.

Anyway, I have tested now with 28mH, it works fine for my use.
But recommend bigger chokes to get it to be a fullrange amp.
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Old 11th March 2017, 10:54 AM   #29
oks81 is offline oks81  Norway
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Ok, so I went for the Lundahl LL2733!
So I listened after all eduard
Also guy in Norway recommended the Lundahls!

Specially ordered them so they are rated for 1,5A / 3A (series/parallell)
I use them i parallel so they are 3A and about 110mH.

Sound is more fresh after installing the Lundahls!

Schematic is the same as in post #19, except the Lundahls and the 50kohm resistor change to 70kohm to increase bias.
Bias is now about 1,85A.

Tested on small bookshelf speakers hum is not bad.
Thinking 110mH work nice!
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