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plate load OPT vs Circlotron load OPT

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Posted on February 11, 2017 at 23:47:59
Eric Chan
Audiophile

Posts: 88
Joined: October 31, 2001



Folk,

I have found an post in AA quoting:

"To decide how a tube operates you need to identify the ground reference for the input signal. In an ordinary common cathode amp the cathode is grounded. In a cathode follower the plate is at AC ground (B+.) In the Circlotron the reference is the grounded center tap of the output transformer. So is it common cathode or cathode follower?"

With my limited knowledge the Cicrlotron is similar to cathode follower in which I always find the typical CF having mid-range compression sonic signature, I always try to avoid having it

It happens that I have just found out that my BAT VK75se in fact is Circlotron structure. I enclose the topology diagram found in Mr. Turner website. Can someone describe if the aforementioned description indicate whether the Circlotron being the plate load or cathode?

 

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RE: Circlotron Cathode Follower, posted on February 12, 2017 at 01:05:48
6AS7_6SN7
Audiophile

Posts: 702
Joined: September 10, 2009
Circlotron is PP.
As all PP arrangements load can be either plate or cathode.
John Broskie has written a lot on this topic.

http://www.tubecad.com/2016/08/blog0353.htm
ecc230

 

RE: Circlotron Cathode Follower, posted on February 12, 2017 at 01:29:29
Eric Chan
Audiophile

Posts: 88
Joined: October 31, 2001
It seem your provided link cannot be found

 

RE: Circlotron Cathode Follower, posted on February 12, 2017 at 01:41:13
6AS7_6SN7
Audiophile

Posts: 702
Joined: September 10, 2009
http://www.tubecad.com/2016/08/blog0353.htm

If it doesn't work just google "Broskie circlotron".


ecc230

 

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