Seeking 6AQ5's Curve Chart - Page 2 - 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 30th September 2003, 03:03 PM   #11
diyAudio Member
 
Join Date: Sep 2003
Location: Deyang, Sichuan, P.R.China
Default something off-topic

Audio Asylum is a good place to visit. But the speed of server is slower than here and it is difficult to post image there, perhaps due to the limited capacity of the rented storage. I always lose patience and can't help jumping to other sites when refreshing the webpage of Audio Asylum. That's why I was extremely excited when I found this place.
  Reply With Quote
Old 1st October 2003, 01:38 AM   #12
diyAudio Member
 
Join Date: Sep 2003
Location: Deyang, Sichuan, P.R.China
Default Something weird

I studied the GE characteristic curve chart but found something comfusing. Coventionally, the plate load resistace for 6V6 or 6AQ5 will fall within the 5K to 7K range, which is manifested in many classical designs. However, according to the chart as following, I have to draw a conlusion that the optimal plate load resistance shall be around the 6K point rather than the widely used 5K benchmark. I've got completely confused 'cause my schematic, a classical design, chooses 5k as the primary resistance of OPT, and according to above conclusion, such choice may not be optimal. Can anybody help me to show an explanation?
Attached Images
File Type: jpg 6aq5-characteristic.jpg (75.1 KB, 225 views)
  Reply With Quote
Old 1st October 2003, 10:36 PM   #13
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Some guy called Tim's going to love me for this but the EL95/6DQ5 is a formidable little penthode as well...

Some of these are DHT beaters, they really are...

Cheers,
__________________
Frank
  Reply With Quote
Old 2nd October 2003, 01:49 PM   #14
diyAudio Member
 
Join Date: Sep 2003
Location: Deyang, Sichuan, P.R.China
Default THD, won't be a headache.

According to manual, when operating in standard status, 6AQ5 will exert moderate power output 4.5w, while the THD will remain at a satisfying level:8%, lower than a group of beam tubes. So I believe THD won't be a big trouble maker.
  Reply With Quote
Old 3rd October 2003, 05:08 AM   #15
diyAudio Member
 
Join Date: Sep 2003
Location: Deyang, Sichuan, P.R.China
Default Still bewildered

And what truly confuses me and is still lingering for reasonable explaination is the choice of optimum load resistance of 6AQ5. I've browsed all the schematics available at my hands and regretfully found that if 6AQ5 is working as a beam tetrode, the OPT will choose 5K as its primary resistance without exception. I really wonder why the designers have not chosen 6K, as the above chart shows. Yes, it is true that the characteristic curve of tubes manufactured by various manufactures may differ from each other, but how come that the designers unanimously choose 5K as the best choice? Still waiting for an answer.
  Reply With Quote
Old 3rd October 2003, 11:03 PM   #16
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Why worry?

Any OPT fit to take a 6V6, 6BQ5 will be fine.

I've seen circuits using anything from 5K to 10K using this kind of tube...
It's a matter of design choices...

Cheers,
__________________
Frank
  Reply With Quote
Old 4th October 2003, 01:48 AM   #17
diyAudio Member
 
Join Date: Jun 2002
Location: Denver, CO
Default Odd harmonic distortion?

Just a wild guess here but perhaps the tube sounds best at something other than "lowest total distortion" point given on the curve? That is, perhaps the odd harmonics are too high at 6k and is better at 5k? Maybe the 3rd and 5th are lower at 5k with 2nd higher proportionately?

Rick
  Reply With Quote
Old 4th October 2003, 02:55 AM   #18
diyAudio Member
 
Join Date: Sep 2003
Location: Deyang, Sichuan, P.R.China
Default Talented Answer.

That's a talented suggestion. Thank you, fraqman56. It is very likely you've hit the point. I will keep the original design.
  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
Volume Displacement For SPL Chart kelticwizard Multi-Way 12 24th November 2013 10:58 PM
NRI 70 tube chart lightguy Tubes / Valves 1 18th November 2007 01:15 PM
Impedance Chart? angsuman Multi-Way 8 23rd May 2006 12:03 AM
Which 6AQ5 dstockwell Tubes / Valves 4 12th December 2005 12:05 PM
Max power output chart for SE and PP ashok Tubes / Valves 2 27th June 2003 09:18 AM


New To Site? Need Help?

All times are GMT. The time now is 01:03 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