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Old 20th March 2004, 07:59 AM   #11
slowmotion is offline slowmotion  Norway
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Quote:
Originally posted by hacknet

would you attribute the organic sound to the 300b or the choke load?
Probably a combination....

cheers
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Old 20th March 2004, 03:46 PM   #12
hacknet is offline hacknet  Singapore
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hmm.. i`ll put that top of my list to get a pair of chokes...


analog_sa: wow, you know martin okay... i actually have a custom trafo winder in mind.

whats to keep in mind when picking a choke other than current capabilities? any special cores to look out for?

BTW, how do you determind the required inductance?

is it through the reactance of a choke to ac at the lowest freqency i want to achieve?
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Old 20th March 2004, 03:59 PM   #13
analog_sa is offline analog_sa  Europe
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Quote:
is it through the reactance of a choke to ac at the lowest freqency i want to achieve
Exactly. So this reactance may be sufficient for a low Rp tube but not for a high Rp.

Nickel content is always good. Not so essential as for interstage transformer but still desirable. Your winder presumably has experience with plate choke winding geometry and knows how to achieve low parasitic capacitance. I mostly use two Lundahl chokes - 1667 and 1668 and between them they cover a large variety of possible tubes. A good friend of mine compared my Lundahls to his Bartollucis and couldn't qiote decide which was better.
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Old 21st March 2004, 02:16 AM   #14
hacknet is offline hacknet  Singapore
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hmm.. okay.. thanks..

any one put a choke at the cathode and used it in a cathode follower?
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