30 W from 6c33b? - 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 31st March 2005, 04:49 PM   #1
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
Default 30 W from 6c33b?

I would appreciate some comments on how this is possible as the author claims and how this circuit is different from others.
The designer was not forthcoming about its functioning.
http://www.audiodesignguide.com/ba/msb_aloia.jpg
  Reply With Quote
Old 31st March 2005, 05:33 PM   #2
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
As the transformer impedance is not shown i wouldn't make any comments upon the max power. As both the anode and grid voltages are shown max power should be easy to calculate with a known load. It can't be much different than any other SE circuit using the same tube.

What else? It's parafeed and there is some cathode NFB through the speaker. Call me paranoid but i wouldn't do this to my speakers
  Reply With Quote
Old 31st March 2005, 05:59 PM   #3
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
Quote:
Originally posted by analog_sa
Call me paranoid but i wouldn't do this to my speakers
I donīt understand your point.Is cathode nfb so objectionable?
Is it possible that the grid is being driven positive and extra power is derived from there?I donīt know if a 6c33b can handle this grid current.
  Reply With Quote
Old 31st March 2005, 07:40 PM   #4
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
No, the grid is not driven positive in this design. I have no probs with cathode feedback and assuming that a faulty tube can fry your speakers is probably far-fetched but then again i am not into OTLs either. After all one principal advantage of transformer coupled tube amps is the galvanic isolation of the speaker.
  Reply With Quote
Old 1st April 2005, 08:22 AM   #5
diyAudio Member
 
Join Date: Dec 2004
Location: Roma
Hi!


I think the secret is A2 class (low power dissipation) and Harmonic Cancellation from the EL34.....

G.M.
  Reply With Quote
Old 1st April 2005, 08:33 AM   #6
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
No grid current. RC coupling.

Maybe he measured it with a square wave. It "takes up more space", making RMS = peak power. Which of course means about 1.5 good watts with a 20:1 peak/average ratio of music.

Tim
__________________
Seven Transistor Labs
Projects and Resources
  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
3W 6C33B-C SE OTL schematics ready vincent_brient Tubes / Valves 12 15th February 2014 06:49 PM
6C33B-C push pull with output transformer vincent_brient Tubes / Valves 20 5th June 2009 07:49 PM
How to choose 6c33b? protos Tubes / Valves 18 9th June 2005 07:52 PM


New To Site? Need Help?

All times are GMT. The time now is 11:19 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2