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Novel Circlotron Topology

77.43.10.3
Posted on October 22, 2009 at 02:08:01
6AS7_6SN7
Audiophile

Posts: 98
Joined: September 10, 2009



Dear Inmates,

Have you ever dreamt of getting out the very best of single ended and circlotron topologies in an OTL amplifier?

Well, I think that I was so lucky in my life to having apparently succeeded in this 'mission impossible'.

This is the conceptual schematic that I am proud to share with all the inmates of the audioasylum.

It requires only one HT voltage and it exhibits the same simulated performance as standard commercial circlotron (no even harmonics at all, predominant third armonic at high level).

In the next posts you will find some snapshots of the currents in the -speaker/coupled inductances/anode common resistor- and the simulated output spectrum @ 330 Hz.

If you ever find this post interesting please make a donation to EMERGENCY humanitarian organization:
http://www.emergency.it/menu.php?A=004&SA=021&ln=En

Best Regards
Luca Cellai
Senior Engineer
Rome, ITALY


ecc230
AS I have posted to your post over on DIY tubes..., posted on October 22, 2009 at 07:47:19
Allen Wright
Manufacturer

Posts: 4729
Location: Schaffhausen
Joined: January 31, 2002
 ...this is NOT a circlotron circuit at all - it is just a differential cothode follower amp.

A circlotron by using two independant powersupplies allows the speaker outout to float free of any bias levels - this doesn't.

Regards, Allen (Vacuum State)

AS I have answered to your post over on DIY tubes..., posted on October 22, 2009 at 23:40:44
6AS7_6SN7
Audiophile

Posts: 98
Joined: September 10, 2009
 Nomina sunt rerum.

I am open to change the name of this 'thing' according to the suggestions with the utmost consensus of the inmates.

Best Regards
Luca Cellai


ecc230
Novel Circlotron Topology - Simulated Output Spectrum - 330 Hz, posted on October 22, 2009 at 02:24:47
6AS7_6SN7
Audiophile

Posts: 98
Joined: September 10, 2009



The simulated output spectrum is exactly the same as the simulated output spectrum of standard circlotron.

ecc230
Novel Circlotron Topology - Currents Snapshot, posted on October 22, 2009 at 02:21:39
6AS7_6SN7
Audiophile

Posts: 98
Joined: September 10, 2009



The coupled inductors in the schematic (L1 & L2) may be made of a cheap toroidal 110V/110V (1:1) - 150 VA mains transformer.

No saturation of the core will ever occur as the bias currents cancel each other.

Red curve: anode resistor
Blue curve: speaker load
Green curves: L1/L2 1:1 coupled inductors
ecc230
RE: Novel Circlotron Topology - Currents Snapshot, posted on October 29, 2009 at 06:53:26
WALLACE
Audiophile

Posts: 24
Location: London, UK
Joined: July 31, 2008
 Have a look at http://www.audiodesignguide.com/doc/aria.html

It's been done before - and the problem is about 3 times the output impedance compaired to a circlotron !

W.

My interest for the 'novel circlotron' is over...., posted on November 4, 2009 at 03:35:12
6AS7_6SN7
Audiophile

Posts: 98
Joined: September 10, 2009
 Even though I could comment that cathode resistors have a quite different electrical behaviour w.r.t. to a transformer (i.e. coupled inductors) I must admit that, after a deeper investigation, the 'novel circlotron' topology is not able to exhibit a 'decent' simulated performance.

My interest for it has hence gone.

Best Regards
Luca Cellai
ecc230
RE: My interest for the 'novel circlotron' is over...., posted on November 4, 2009 at 03:56:46
WALLACE
Audiophile

Posts: 24
Location: London, UK
Joined: July 31, 2008
 Never mind - new ideas are always worth trying out !

W.

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