Suggestion on tube for CCS - 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 15th January 2008, 11:16 PM   #1
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default Suggestion on tube for CCS

I am looking for a pentode to use as a CCS, or part of a hybrid Pimm style CCS. I'd like about 30 to 35mA, an octal or loctal base, and to drop the least amount of volts possible. Oh, and cheap is good. Suggestions?
  Reply With Quote
Old 15th January 2008, 11:42 PM   #2
billr is offline billr  New Zealand
diyAudio Member
 
Join Date: Dec 2003
Location: new zealand
hello

If you can get your hands on Valve Amplifiers, 3rd Edition, by Morgan Jones, he has such a list available.

This list has valve type, current draw, and I think volts drop too.

I'm sorry I don't have my copy to hand.

Others may be able to assist.

Kind regards

Bill.
  Reply With Quote
Old 15th January 2008, 11:55 PM   #3
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Again, 12L6
__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 16th January 2008, 12:17 AM   #4
Ipanema is offline Ipanema  Malaysia
diyAudio Member
 
Ipanema's Avatar
 
Join Date: Jun 2004
Location: KL
Wonder why transistor base CCS is not very popular in tube amp? What's your experience on this?

Regards.
  Reply With Quote
Old 16th January 2008, 12:43 AM   #5
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally posted by Ipanema
Wonder why transistor base CCS is not very popular in tube amp? What's your experience on this?
Very popular. Rich experience. The question was, "Which tube". 12L6 is one good option for such current and voltage. It is good as well on such currents/voltages when triode strapped.

__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 16th January 2008, 12:44 AM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
hey-Hey!!!,
Build one with two tubes. One triode and a pentode. Cascode connection like Gary Pimm designed MOSFET CCS. Pick high gm/high plate Z pentode for the top, and high gain( within plate Z limits as set out by design parametes ) for the bottom triode. This will burn significant amounts of B+, but it can work *VERY* well.
cheers,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 16th January 2008, 12:50 AM   #7
diyAudio Moderator Emeritus
 
ray_moth's Avatar
 
Join Date: Jan 2004
Location: Jakarta
Quote:
I'd like about 30 to 35mA, an octal or loctal base, and to drop the least amount of volts possible.
Sounds like you're looking for the type of pentode that would be suitable as the pass-element in a voltage regulator. In Steve Bench's multi-part article on voltage regulation, he uses the EL509 throughout. I'd guess there are others that might be suitable.
  Reply With Quote
Old 16th January 2008, 12:55 AM   #8
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
Default Re: Suggestion on tube for CCS

Quote:
Originally posted by dsavitsk
to drop the least amount of volts possible.
On this, getting a large current-set/cathode R can burn up significant voltage. Unbypassed cathode resistance has a predictable, and useful effect on the circuit as a whole( increased plate Z ), so consider spending B+ on useful performance trades, yes?
cheers,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 16th January 2008, 01:13 AM   #9
Ipanema is offline Ipanema  Malaysia
diyAudio Member
 
Ipanema's Avatar
 
Join Date: Jun 2004
Location: KL
i got a piece of EH ECC88 only. Most of the design I saw are either using resistor/tube load. I'm a tube virgin and a cheapskate too Do you have any design using transistor CCS for this tube?

If you don't mind, can you help to explain what are the pro and con of using transistor CCS compared to tube? Any link would be appreciated as well.

Thank you.
  Reply With Quote
Old 16th January 2008, 05:50 AM   #10
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Thanks for the suggestions. Application is I have a chassis with space for 2 octals and 2 novals, and I was thinking of putting something like this on it. I figured the tube ccs would fill the octal spots. As drawn, it would need a sand ccs as otherwise the voltage is too low.

Click the image to open in full size.
  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
Need suggestion for tube MC pre-pre inertial Analog Line Level 18 8th March 2009 08:28 PM
Suggestion for this tube preamp fastvideo Tubes / Valves 7 14th July 2008 09:02 PM
Suggestion on the input transformer for tube preamp bee696 Tubes / Valves 3 2nd August 2006 04:43 AM
subminiature tube suggestion dsavitsk Tubes / Valves 13 22nd December 2005 06:09 PM
any suggestion about MTM? foo Multi-Way 0 15th May 2004 07:19 AM


New To Site? Need Help?

All times are GMT. The time now is 02:13 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