26H choke good enough for a grid or anode choke? - diyAudio
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Old 2nd December 2011, 04:38 AM   #1
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Default 26H choke good enough for a grid or anode choke?

I have a 4 watt SE amp that uses a single EL84 tube per channel driven by a single 12AT7. I beefed up the power supply (SS rectified) by adding 4 120uf caps and was happy with the results. I have quite a few 26H miniature chokes and was thinking of trying them out as either gride or anode chokes or both. Is this inductance to low? Should I use a resister in series with it if the inductance is too low? Their size is about 1"X1"X1" .
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Old 2nd December 2011, 04:54 AM   #2
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26 microhenrys?
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Old 2nd December 2011, 05:14 AM   #3
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26H is good inductance, but I am afraid that your miniature chokes would saturate in such conditions. Most probably they are good for some kind of low signal crossovers, or equalizers. I have tiny transformers, something like 1"x1"1/4", with couple of 12H coils, and they are great when used to equalize RIAA curves for phono stages.
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Old 2nd December 2011, 01:23 PM   #4
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Quote:
Originally Posted by Wavebourn View Post
26H is good inductance, but I am afraid that your miniature chokes would saturate in such conditions. Most probably they are good for some kind of low signal crossovers, or equalizers. I have tiny transformers, something like 1"x1"1/4", with couple of 12H coils, and they are great when used to equalize RIAA curves for phono stages.

Thanks for the reply. The coils were originally PCB mount 120V to 12V step down transformers. A low wattage one, maybe a few VA's. The primary side is 26H's, the secondary side 150mh. So next steps probally should be to figure out what there current rating is.
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Old 2nd December 2011, 01:24 PM   #5
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Originally Posted by GloBug View Post
26 microhenrys?
They are 26 Henry's
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Old 2nd December 2011, 05:39 PM   #6
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The second picture looks like an easy install. It looks like at that point in the circut, current shunting would be very low.
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Old 2nd December 2011, 05:46 PM   #7
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The second picture looks like an easy install. It looks like at that point in the circut, current shunting would be very low.
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Old 2nd December 2011, 06:05 PM   #8
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I would not consider 26H enough for a grid choke.
26H is a little over 3k AC impedance at 20Hz; that will load the preceding stage too much.
The LL1670 in the picture is 540H and that is for a good reason.
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