Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

7-pin miniature tubes for audio?
7-pin miniature tubes for audio?
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 3rd March 2007, 11:40 AM   #11
soundbrigade is offline soundbrigade  Sweden
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
Rectifier 6X4.

I am about to build a tiny 6AQ5/EL95PP wich is said to be a littlebrother to 6AQ5/EL84.
I have a bunch of 7-pin pentodes for "painful STC-experiments".

What I don't like is the small 7-pin socket, but on the other hand I go for these kind of tubes because of the size - less is more.
__________________
/Magnus
Due to economical cutbacks, the light at the end of the tunnel has to be switched off.
  Reply With Quote
Old 3rd March 2007, 02:51 PM   #12
Eli Duttman is offline Eli Duttman  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Quote:
Originally posted by soundbrigade
Rectifier 6X4.

I am about to build a tiny 6AQ5/EL95PP wich is said to be a littlebrother to 6AQ5/EL84.
I have a bunch of 7-pin pentodes for "painful STC-experiments".

What I don't like is the small 7-pin socket, but on the other hand I go for these kind of tubes because of the size - less is more.

Magnus,

EL84 = 6BQ5 EL90 = 6AQ5 EL95 = 6DL5

The 70 mA. a 6X4/EZ90 yields is certainly enough for a monoblock PP 6DL5 amp. Use 2 with paralleled plates for a stereoblock.

BTW, you could build an all 7 pin "El Cheapo". Matching up pairs of 6AB4s for the splitter/driver is a way. A 2nd way is 6J6/ECC91 as the splitter/driver mated to a line stage with gain.
__________________
Eli D.
  Reply With Quote
Old 3rd March 2007, 05:06 PM   #13
Runco990 is offline Runco990  United States
diyAudio Member
 
Runco990's Avatar
 
Join Date: Jan 2007
Location: Los Angeles
Speaking of small tubes, has anyone looked at this: http://www.impamp.com/

Interesting.... I'd love to play with one, but too steep for me. I have some very tiny tubes in my geiger counter, but never thought of audio.

Marc
  Reply With Quote
Old 3rd March 2007, 05:34 PM   #14
Klimon is offline Klimon  Belgium
diyAudio Member
 
Join Date: Apr 2005
Location: Leuven
They claim "10-20KHz +0/-2dB"; is this anywhere near possible with that miniature size opts, even with truckloads of gNFB??

Simon
  Reply With Quote
Old 3rd March 2007, 05:38 PM   #15
Runco990 is offline Runco990  United States
diyAudio Member
 
Runco990's Avatar
 
Join Date: Jan 2007
Location: Los Angeles
I'm also wondering about the speaker demo. Is it even possible to get that low an oscillation through an OPT??

Marc
  Reply With Quote
Old 3rd March 2007, 05:57 PM   #16
rdf is offline rdf  Canada
diyAudio Member
 
rdf's Avatar
 
Join Date: Jun 2004
Location: big smoke
I have, but it was a Hammond 1628SE. Each tranny probably weighs as much a three iMPAMPs.
  Reply With Quote
Old 3rd March 2007, 06:22 PM   #17
soundbrigade is offline soundbrigade  Sweden
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
I wanted to test this variation for 6AQ5: Cathode-coupled Paraphase

BTW - I always forget but there is a sort of EL84/6BQ5 with top anode and that is sturdier built than a "normal" EL84. I think it was a 7-pin tube but I may be wrong.
__________________
/Magnus
Due to economical cutbacks, the light at the end of the tunnel has to be switched off.
  Reply With Quote
Old 3rd March 2007, 07:04 PM   #18
aletheian is offline aletheian  United States
diyAudio Member
 
aletheian's Avatar
 
Join Date: Apr 2004
Location: Philly
Quote:
Originally posted by ray_moth
6AU6 (or 6AU6A) is quite often used in audio, either as a pentode voltage amplifier or as a CCS. It can also perform very well strapped as a triode.

Yes, they are plentiful as dirt and work well in a lot of applications... one of my favs. One trick that I picked up on this board... i THINK from you ray_moth... ground the plate so that it acts as a sheild, and run it in triode mode with G2 as the plate. I have tried it with a few 6au6 and it works great. I don't know if there are any caveats to running it this way, but it seems to work alltogether better than regular triode mode.
__________________
Heghlu'meH QaQ jajvam!
  Reply With Quote
Old 3rd March 2007, 07:09 PM   #19
soundbrigade is offline soundbrigade  Sweden
diyAudio Member
 
soundbrigade's Avatar
 
Join Date: Feb 2006
Location: Vaenersborg, Sweden
Send a message via MSN to soundbrigade
To aletheian: how about it's parameters when doing like that?? A pentode is often used (trioded) as they have better gain.
__________________
/Magnus
Due to economical cutbacks, the light at the end of the tunnel has to be switched off.
  Reply With Quote
Old 3rd March 2007, 07:18 PM   #20
Tom Bavis is offline Tom Bavis
diyAudio Member
 
Tom Bavis's Avatar
 
Join Date: Jun 2002
Location: Macedon NY
Ray had an an article on the 6AU6, and I posted it on my site: http://www.audiophool.cjb.net/Misc/6...ed%20plate.pdf
  Reply With Quote

Reply


7-pin miniature tubes for audio?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
microphonic sub-miniature tubes? space-cake Tubes / Valves 11 10th October 2008 02:02 PM
UHF tubes for audio? bst Tubes / Valves 7 17th July 2008 01:46 AM
Near RF/audio tubes east electronics Swap Meet 3 25th November 2007 04:14 PM
miniature audio amplification project help needed vick56 Everything Else 0 10th February 2005 07:14 PM
Miniature ESL BennySP Planars & Exotics 9 10th June 2002 06:23 PM


New To Site? Need Help?

All times are GMT. The time now is 11:21 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki