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In Reply to: RE: Also, how do you determine what mA rating to use? posted by vinnie2 on December 11, 2014 at 03:26:40
Hammond chokes are pretty much rated for cap input.
Look for examples of what other people have used. I know Hammond has a 5H in the 50 ohm range, but its tough to say weather or not it will buzz.
A small cap, up to about .68uf in front of the choke input will help alleviate buzz... once the voltage starts to climb though, you're running a cap input...
Follow Ups:
I asked Hammond (here in the great white north) and they said their chokes are good for either choke or cap input. They pointed out that their spec sheets show both options and they have been spec'd that way. I'll take them at their word as I've used them in both ways with no issue.
Hammond chokes (the clamp-mount ones) have the advantage of being cheap and readily available . The inductance tends to fall off as current increases . DCR also seems high and the cores are nothing special . The same applies to Triad . I have used both Hammond and Triad , both get the job done . You get what you pay for . I don't know what the more pricey Hammonds are like but the cores are still standard lams by the looks of things . I now get my chokes custom built in batches of at least 10 with M6 lams and over-rate by about 50% over modelled peak current . I would recommend inmates here doing the same and splitting a batch in a group buy .
Al
I've found Hammond chokes don't carry true to their spec'd current and core saturation occurs below their current rating.
I too have gone to custom wound chokes with M6 lams....you do get what you pay for.
Hammonds are more intended for standard capacitor input usage , purely as smoothing chokes . However , I have used their 660mH 750mA (159Y?) chokes as cathode loads in an SE OTL amp and got good results .
Al
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