Hybrid Circlotron Amplifier with only 3 components on the signal path - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th December 2010, 09:33 AM   #1
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
Default Hybrid Circlotron Amplifier with only 3 components on the signal path

Hybrid better than SE vacuum tube amp. ?

Look my simple design in testing phase

Hybrid Amplifier by Andrea Ciuffoli
  Reply With Quote
Old 5th December 2010, 02:15 PM   #2
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
The "signal path" is a concept which, as normally used, is meaningless. I can see at least 8 components which could affect the signal, quite apart from the power supply.
  Reply With Quote
Old 5th December 2010, 03:02 PM   #3
banat is offline banat  Serbia
diyAudio Member
 
Join Date: Dec 2009
Location: near Belgrade
Quote:
Originally Posted by audiodesign View Post
Hybrid better than SE vacuum tube amp. ?

Look my simple design in testing phase

Hybrid Amplifier by Andrea Ciuffoli
Cool & Elegant Hibrid Circlotron Amp Design

Go Forward
  Reply With Quote
Old 5th December 2010, 03:11 PM   #4
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
Quote:
Originally Posted by DF96 View Post
The "signal path" is a concept which, as normally used, is meaningless. I can see at least 8 components which could affect the signal, quite apart from the power supply.
This is true!

I am considering only the main components: tube, interstage transf. and mosfet.

If I compare this project to others this is a not common design, also my PF2007 system is more complex because need the output capacitor.
PF2007: the system

I see as large influence in the sound the cathode capacitor that I cannot eliminate but it can be considered an advantage because you can use it to modify the sound.

Some candidates are:
1) Sanyo OS-Con - very neutral but a little bit too hard
2) ELNA Cerafine - very smooth, good to lay normal CD
3) ELNA Silmic II - less smooth of Cercafine but still too much

In my last GM70 SE dc coupled
GM70 amplifier with Fiat transformers
I have got a good benefit using a led ( in the optocoupled) instead of cap/res. on cathode but here I cannot apply it because the low frequecny band will be too much compromised.
  Reply With Quote
Old 5th December 2010, 08:53 PM   #5
diyAudio Member
 
hidnplayr's Avatar
 
Join Date: Sep 2008
Nice work!
I have been wanting to build something like this using BUZ901's and 2xECF80 in a long tailed pair, with cathode followers.
__________________
Real tubes have top-caps
  Reply With Quote
Old 6th December 2010, 05:08 AM   #6
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
In my test 2SK1058 are much better than BUZ900P.
  Reply With Quote
Old 6th December 2010, 06:11 AM   #7
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
In my test 2SK1058 are much better than BUZ900P.

The minimum distortion with BUZ900P is at the bias point 30V DC and 900mA at any output level.

Using the 2SK1058 the minimum distortion is at the bias point 30V DC and 1600mA and the level is 60-70% less than BUZ with the same input stage.

You cannot use IRF types and 2SK1529 because these need a thermal compensation circuit.

Last edited by audiodesign; 6th December 2010 at 06:17 AM.
  Reply With Quote
Old 7th December 2010, 03:04 PM   #8
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
I am tesing soon the new Profusion lateral mosfet to reduce output impedance.

Profusion plc, Audio Semiconductors and Components

The final chassie will be HiFi-2000 H=210mm

The power supply probably will be increased to 40V DC.
  Reply With Quote
Old 7th December 2010, 06:51 PM   #9
diyAudio Member
 
tympani1d's Avatar
 
Join Date: Dec 2009
Location: Northern Illinois USA
Will boards and kits be available?
__________________
I think; therefore will NOT be Politically Correct.
  Reply With Quote
Old 7th December 2010, 07:19 PM   #10
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
yes, probably a pcb will be necessary for the protection circuit and filaments-bias power supply.

I think will be possible also use protection modules available on Ebay.

A complete set of all parts and shop will be available.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hybrid OTL Circlotron idea revintage Tubes / Valves 85 3rd September 2008 12:06 AM
Hybrid Circlotron ready to build revintage Solid State 16 1st April 2008 09:51 AM
Capless signal path? Solid Snake Solid State 40 8th December 2003 03:51 PM


New To Site? Need Help?

All times are GMT. The time now is 09:14 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2