5881, 6V6, EL84, or 7591 for triode-strapped operation? - 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 26th November 2010, 09:26 PM   #1
diyAudio Member
 
Join Date: Nov 2010
Default 5881, 6V6, EL84, or 7591 for triode-strapped operation?

Hi, I'm a new member and a newbie to tube audio. I've been building, fixing and modding guitar amps for about 10 years, but most of us guitarists take a far cruder approach to tube circuitry than y'all do.

I'm thinking of building a tube-driven iPod dock with SET output stages, just as a starter project. I'm going to stick with inexpensive and readily-available tubes and transformers. I'd like to use tubes with 6-volt filaments and indirectly-heated cathodes for simplicity's sake, which I think will limit me to triode-strapped pentodes or beam-forming tetrodes. Maybe I'll put a triode-ultralinear-pentode switch on the back of the chassis just for fun.

I'd also like to stick with tubes that are no taller, or at least not much taller, than an iPod classic.

So, as far as I know, the prime candidates are 5881, 7591, EL84, and 6V6. I'll probably use a 5Y3 or GZ34 for a rectifier and make a 5-volt regulated DC supply for the iPod using one of the heater windings on the PT.

I'd appreciate any comments or recommendations regarding using any of these tubes triode-strapped. Also, if there is already a proven DIY design for a SET output stage using one of these tubes and an inexpensive output transformer, I'd appreciate if anyone could point me toward it.
  Reply With Quote
Old 26th November 2010, 10:00 PM   #2
diyAudio Member
 
Miles Prower's Avatar
 
Join Date: May 2005
Location: USA
Blog Entries: 7
Quote:
Originally Posted by Shea View Post
I'm thinking of building a tube-driven iPod dock with SET output stages, just as a starter project. I'm going to stick with inexpensive and readily-available tubes and transformers. I'd like to use tubes with 6-volt filaments and indirectly-heated cathodes for simplicity's sake, which I think will limit me to triode-strapped pentodes or beam-forming tetrodes. Maybe I'll put a triode-ultralinear-pentode switch on the back of the chassis just for fun.
6AQ5s (7 pin mini version of 6V6) make nice pseudotriodes, if you don't require very much power because you're not gonna get very much from any SET unless you go for something like a 845 or trioded 813 and the bigvolts they'll require.
__________________
There are no foxes in atheistholes
www.dolphin-hsl.com
  Reply With Quote
Old 26th November 2010, 11:40 PM   #3
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
6AQ5, 6V6, 12L6GT, 6П1П, all are nice triodes. Also, I like very much 6П15П as triodes.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 27th November 2010, 12:35 AM   #4
tikiroo is offline tikiroo  Australia
diyAudio Member
 
Join Date: Nov 2007
Location: Mount Gambier
I have 7591's running in triode mode (for hifi not guitar), getting about 8-9W in push pull class A with 400V supply so single ended should get about 4W I guess. JJ has triode curves for the 7591 on their website.
  Reply With Quote
Old 27th November 2010, 12:48 AM   #5
diyAudio Member
 
Join Date: Nov 2007
I agree with Wavebourn on the 6P1P. Very nice as triode or pentode SE (haven't tried UL yet). 6P1P-EV take a looooong time to break in and sound their best.
My computer amp is a 6N1P-EV driving two 6P1P-EV in pentode SE and it produces a very clean 3W or so with OPTs pulled from a ECL82 tubed console (original console had 3.5 ohm speakers, but I am running 8 ohms so the impedance the the 6P1P sees must be up around 9-10k) .
  Reply With Quote
Old 27th November 2010, 12:55 AM   #6
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
As long as 2 WPC is sufficient, any member of the 6V6 clan will do very nicely. Tubes in the clan include: 6V6, 7C5, 6005, and 6AQ5.

BTW, a 5965 would be an excellent choice as the voltage amplifier.
__________________
Eli D.
  Reply With Quote
Old 27th November 2010, 09:24 PM   #7
diyAudio Member
 
Join Date: Nov 2010
Thanks everyone!
  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
E180F triode-strapped. jim Tubes / Valves 28 Today 07:01 AM
triode strapped tetrode nhuwar Tubes / Valves 2 2nd February 2008 10:14 PM
Triode strapped tetrode nhuwar Tubes / Valves 5 7th May 2007 02:08 PM
5763 Triode Strapped wrenchone Tubes / Valves 3 5th August 2006 07:59 PM
Triode strapped heptode? ilimzn Tubes / Valves 7 25th December 2005 11:54 PM


New To Site? Need Help?

All times are GMT. The time now is 07:05 AM.


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