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Re: plate choke,coupling capacitor,grid choke 6sn7 into 2a3

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px25er

(A)

In Reply to: Re: plate choke,coupling capacitor,grid choke 6sn7 into 2a3 posted by danlaudionut on October 11, 2006 at 20:32:51:

Thanks Dan1,
I am familiar with the products you proposed. I take it you currently are using them and it sounds good. Sometimes the LC tanks cause resonant issues. What value of cap are you using? I recently bought some foil/teflon capacitors which are doing very well. I replaced my jensen copper foil/oil caps. Be careful soldering the silver foil types they short very easily. I design and wind my own iron chokes,opts cause it's fun. But I am always curious as to the iron people like. I have OPts from james,electraprint,handwound(out of business). I currently have a homemade 4000h grid choke and 100H plate choke good for 10ma dc and 3 different OPTs I made. I was wondering whether I should reevaluate some different values. Are you using parafeed or series OPT set? I have done both.

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Re: plate choke,coupling capacitor,grid choke 6sn7 into 2a3 - danlaudionut 07:04:21 10/12/06 (3)
px25er
I am in between amps right now.
I just took apart my CT KT90 amp - never got it to sing.
Sounded great - did everything right except play music.
It was parafeed, of course.
I am about to try to use most of the parts for a SE KT66.
EXO-01 load for the 6SN7 and the BCP-16NI for the KT66.
My coupling cap will be a .1uFd Vitamin Q I have on hand
because I am using it in a bi-amp situation (above 200Hz).
I will have to get OPTs though - 800:8 won't work here.
As far as resonances are concerned I model them on PSUD2
and that tells me if I am going to have resonance or not.
I am using a 100uFd first cap and a 20uFd second cap.
GE 97F motor run cap and a Mundorf second cap.
DanL
- Re: plate choke,coupling capacitor,grid choke 6sn7 into 2a3 - px25er 07:41:01 10/12/06 (2)
  Howdy DanL,
  I am not familiar with psud2. I will hit the internet to learn more. I biamp as well at 100hz. Linkwitz-riley used to filter into my Macintosh mc-60s. The 2a3 amp gets all frequencies. I use an open back enclosure lowther dx3. The iron always seems to be the expensive part and your are never exactly sure what you get-- as parameters are hard to come by from manufacturers. You have to test a few to know what I mean. I have heard Vit-Q especially old military types are good if not dried out. I ended up with SET series transformer. Less variables than parafeed and I like the fact that there is no zero flux condition with dc offset. I can still get plenty of inductance for low end and hyster losses are lower. No exotic steels needed in airgapped transformer--nickel,amorphous,cobalt just good old m-6 or m19. Of course no electrolytics in my power supply. What do we constantly tinker with these amps? Cause it's fun!
  - PSUD2 link -- It's free - danlaudionut 09:50:15 10/12/06 (1)
    DanL
    - PSUD2 download Page (Open in New Window)
    - Re:thanks for link - px25er 11:07:41 10/12/06 (0)
      Dan,
      I will have to put my 5u4 power supply into the simulator. The LC tank resonances I was referring to are the plate choke,coupling cap and the grid choke not the power supply but thanks for the info on the free software on power supplies.
      Px25er

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