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Plate chokes - choosing and using
Plate chokes - choosing and using
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Old 15th September 2021, 05:12 AM   #31
Paul Joppa is offline Paul Joppa  United States
diyAudio Member
Join Date: Nov 2008
Nothing special in this post, just validating that the Hammonds work as expected as plate chokes, within their ratings.

Some years (decades?) ago I build a preamp test bed with several switchable chokes 30H to 72H if I recall correctly. The tube was a 6BL7, rp 2K2. There were four different inductances, and each increase was an audible improvement. (I was mostly listening for midrange clarity/resolution at the time, not frequency extension.)

I added a current source to the options, and that seemed clearly better than any choke, but it shifted the operating point too far to call it a valid comparison.

I've also used the 157G in a prototype 2-watt amp with 6DN7, rk 2K5, parafeed into an 8K:8 ohm output transformer driving an 8-ohm speaker. It worked without issues, but neither the choke nor the transformer I used was adequate for very deep bass - see first paragraph.
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Old 15th September 2021, 07:00 AM   #32
andyjevans is offline andyjevans  United Kingdom
diyAudio Member
Join Date: Sep 2003
Location: London
Good to hear your very extensive experience, Paul. Thanks for coming in.

I also have found that each increase in inductance was an audible improvement, again in midrange clarity. I'll have to get my Bartola gyrators working - some glitch I haven't fixed.

Could you say something about comparing plate chokes and active loads to a plain resistor load?
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