Ok guys, get your daggers out.......

amperex · 22nd February 2006, 11:05 PM

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........

Zen Mod · 22nd February 2006, 11:24 PM

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....

arnoldc · 22nd February 2006, 11:42 PM

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.

richwalters · 23rd February 2006, 04:49 AM

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

Joel · 23rd February 2006, 12:49 PM

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."

amperex · 23rd February 2006, 04:20 PM

Not even a comparsion Joel. Later.......

pedroskova · 23rd February 2006, 06:11 PM

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.

Kent Smith · 23rd February 2006, 06:47 PM

I prefer to use an interstage transformer now, both for coupling stages and creating push-pull signal.

22nd February 2006, 11:05 PM	#1
amperex diyAudio Member Join Date: Feb 2005 Location: MI	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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22nd February 2006, 11:42 PM	#3
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	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.

23rd February 2006, 04:49 AM	#4
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	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

23rd February 2006, 04:20 PM	#6
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Not even a comparsion Joel. Later.......

23rd February 2006, 06:11 PM	#7
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	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.

23rd February 2006, 06:47 PM	#8
Kent Smith diyAudio Member Join Date: Jun 2004 Location: Wylie, Texas	I prefer to use an interstage transformer now, both for coupling stages and creating push-pull signal.

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