[paulluvsmusic]

Hi all, this is a newbie question I imagine but I have been reading about anode chokes and grid chokes lately and how many people are getting great results, well anyway I have purchased a pair of 50H 100ma anode/plate chokes. Now I'm trying to figure out where to put them? Do I put the choke between the OPT and the anode? Thanks ahead for anyone who can steer me in the right direction.

 

[paulluvsmusic]

So still trying to make sense of it, I'm guessing I run the choke in series with OPT which should increase gain to tube and filter some HF noise??? Anyone?

 

[dsavitsk]

What circuit/amp are you trying to use these with? You use them with a cap coupled parafeed output transformer, so if you don't have that, you can't use them. They won't just drop into an existing single ended amp.

 

[paulluvsmusic]

Thank you for the reply, so does that mean I use the choke as the OPT to carry the DC current and couple the OPT with a capacitor to carry the signal?

 

[dsavitsk]

Yes. The problem you'll run into is that the whole point of doing this is so one can use output transformers that are not gapped. Yours are, so parafeed topology probably doesn't help anything. For some background reading, start here: http://diy.ecpaudio.com/p/parafeed-tutorial.html

 

[paulluvsmusic]

Ok, thanks for the link! Is it worth going down the nongapped OPT plus anode choke vs the gapped OPT with no anode choke?

 

[dsavitsk]

There are certainly people who prefer parafeed over single feed. I don't think the differences are huge, both can be done well, and both present challenges.

 

[paulluvsmusic]

Thanks heaps for your help

 

[paulluvsmusic]

Couldn't help myself , so wired up the parafeed setup with my gapped OPT's .Lost all my low bass but could hear the difference in the midrange and the treble.Think I better get some un-gapped OPT's.
Thanks again Dsavitsk

 

[tunedinaudio]

It makes sense that the parafeed configuration should be more natural as the OPT in this configuration is reflecting what is happening across the 300B rather than in the single ended configuration where it is acting in a more reactive way. You would have to think the key benefit of not carrying the HV DC feed is that it enables the OPT to have better focus on the audio aspect of the circuit, but yes get the gap out if the equation and all will be revealed.

 

[paulluvsmusic]

Yep, very excited to do this right I'm going to order a pair of Lundahl LL1664PPZ's, they should do the trick.