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Old 22nd February 2006, 11:05 PM   #1
amperex is offline amperex  United States
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Default Ok guys, get your daggers out.......

I am probally read as a 'know it all' at times per my posts. I been designing my own projects for a while. I have had access to 100s of vintage tubes.

The other day I placed 50 HY 400 ohm DCR plate chokes in my monoblock driver/splitter tube circuit & my SE stereo linestage. I have been a stickler regarding top quality components, but never used a plate choke.

The amps simply opened up more than I heard before. I will not ever build small signal amp without a plate choke.

Now for interstage driver transformers I bet I also have something to learn........
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Old 22nd February 2006, 11:24 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: Ok guys, get your daggers out.......

Quote:
Originally posted by amperex
I am probally read as a 'know it all' at times per my posts. I been designing my own projects for a while. I have had access to 100s of vintage tubes.

The other day I placed 50 HY 400 ohm DCR plate chokes in my monoblock driver/splitter tube circuit & my SE stereo linestage. I have been a stickler regarding top quality components, but never used a plate choke.

The amps simply opened up more than I heard before. I will not ever build small signal amp without a plate choke.

Now for interstage driver transformers I bet I also have something to learn........

now you start to learn what "signal energy" really means....
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Old 22nd February 2006, 11:42 PM   #3
arnoldc is offline arnoldc  Philippines
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i've been using plate choke on my 417A driver to the 45 with grid choke too.

never looked back.

interstage, i always wanted to try, but Lundahl price is out of my reach.
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Old 23rd February 2006, 04:49 AM   #4
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For some years I've used and old ECL82 p-p o/p tranny as a p-p plate driver one in one of my p-p amps and yes the sound "opened up" despite distortion figures showing worse than for R-C loading. The beauty is the massive voltage swing available.
Clearly there's more to this thd business that needs explaining i.e the relationship of the output stage and driver stage Miller effect and varactor properties.. However, the Radiotron designers bible explains the plate choke well.

richj
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Old 23rd February 2006, 12:49 PM   #5
Joel is offline Joel  United States
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Quote:
I will not ever build small signal amp without a plate choke.
That's as silly as saying, "I will never use a 270k ohm resistor in an amp again."
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Old 23rd February 2006, 04:20 PM   #6
amperex is offline amperex  United States
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Not even a comparsion Joel. Later.......
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Old 23rd February 2006, 06:11 PM   #7
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I experienced the same thing with my 12B4A preamp. I'm using the primary of a line transformer...along with a dollup of plate-to-grid feedback. Jack at Electraprint has very reasonably priced plate chokes that will be used for my next project, although they can get pricey if you want to use them with a power tube.
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Old 23rd February 2006, 06:47 PM   #8
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I prefer to use an interstage transformer now, both for coupling stages and creating push-pull signal.
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