How this circuit works (Baby Huey type) - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 14th November 2008, 09:57 PM   #11
diyAudio Moderator Emeritus
ray_moth's Avatar
Join Date: Jan 2004
Location: Jakarta

The cathode voltage is higher than the grid voltage in rockgardenlove's made-up figures. This will not cause grid current.


I think you have confused yourself with your "totally made up grid voltage = .3 volts". Where did that come from? Both grids will be at ground potential under no-signal conditions.

This is not a "Baby Huey" type of design. BTW, there is an incorrect statement in the article:
Only one tube is driven in this circuit as opposed to two in the normal type of output stage. This means that the required driving voltage is halved which, in this case, now amounts to 11 volts
That is not the case, because the voltage gain of the OP stage is halved in this arrangement. If you apply the drive signal to only one grid, it needs to be twice as high.

I dislike this design, personally, because it's suboptimal and it seems pointless. If the input stage used a double triode instead of a single triode, then a grounded cathode stage followed by a concertina splitter could be used and the OP stage could then follow conventional design. This would give much better balance. A concertina splitter would be fine to drive EL84s directly.
  Reply With Quote
Old 15th November 2008, 08:41 AM   #12
diyAudio Member
aardvarkash10's Avatar
Join Date: Mar 2007
Location: Auckland, NZ
Default go here...

lots of people using this tehnique now. Heres some...

and here

simple - low drive requirement, low parts count. All associated advantages and disadvantages...
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
  Reply With Quote
Old 15th November 2008, 08:53 AM   #13
poobah is offline poobah  United States
diyAudio Member
poobah's Avatar
Join Date: Nov 2005
I think you were reading my mind Ray...
  Reply With Quote
Old 15th November 2008, 03:08 PM   #14
diyAudio Member
smoking-amp's Avatar
Join Date: Dec 2001
Location: Hickory, NC
Ahhh.., the half power output issue comes up because it has to run class A to do the inversion in the cathodes, while the normal inverted drives can be run class AB.
  Reply With Quote


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
EL84 Amp - Baby Huey gingertube Tubes / Valves 1761 26th May 2017 09:18 AM
Could this become a Baby Huey killer ? Jaap Tubes / Valves 240 7th May 2009 07:09 PM

New To Site? Need Help?

All times are GMT. The time now is 04:18 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2