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In Reply to: RE: Parafeed caps, who needs them? posted by Ivan303 on June 09, 2023 at 08:00:11
Being as this is the DIY forum...
How about a large bank of Leyden jars?
Actually, I've become more interested in parafeed lately. What type choke do you use with the 2A3s?
Follow Ups:
Choke on the 2A3 is rated at 60H (50ma?) but the kit builder (Doc Bottlehead) isn't revealing their current 'winder' or many other specs.
Lots of active loading and shunt regulation around the 396A/2C51/5670 driver tube, so these are clean/detailed/uncolored sounding amps. EML 2A3 mesh plate tube adds a bit of 'mellow' to the party.
Also have a full set of custom wound Tribute 'double 'C' core iron for a 45> 845 parafeed> parafeed amp with 200H/50ma and 100H/100ma chokes which are MASSIVE.
Have heard a few tube amps in my day and some of the best sounding were parafeed. With 106 dB horns I don't require much in the way of wattage so SE 2A3 is more than enough.
"Reality cannot exist because it cannot keep up with the lies on the Internet."
What I find attractive about parafeed is the elimination of the shortcomings of large gapped transformers. I'm interested in the concept of a parafeed design that would combine a relatively inexpensive choke with an ungapped iron or ferrite output transformer. The downside to parafeed for me has always been my dislike of large series caps carrying the signal. However, I've come to realize that low frequency response and other characteristics of gapped transformers commonly available for higher power levels are probably worse, sonically speaking. It all depends on whether a cap can be found that is truly transparent in the midrange.
Edits: 06/09/23
Lots of H with not some much R being good and not THAT expensive as chokes go.
OTOH, film caps of the size and voltage required for blocking DC are getting better and better and decent can be had cheap (Solen) with better but a few $$$ more.
And for that you get some PS isolation and quiet, or so I am told.
I can recall many moons ago when a 5uF 600V-800V parafeed cap would by default be electrolytic.
Same for cross-over caps in your favorite speaker. But we lived through it.
With horns and a horn sub, I have no need for a low frequency capable power amp.
"Reality cannot exist because it cannot keep up with the lies on the Internet."
How about these? https://www.digikey.com/en/products/detail/cornell-dubilier-electronics-cde/UNL10W10K-F/1531169
Also 4.7 @ 1500V and 7.5 @ 1200V in that can size.
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