Teeny Tiny Spud - 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 18th November 2013, 02:10 AM   #1
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
Default Teeny Tiny Spud

I have some Russian 6R4P double pentodes I bought on spec - they incorporate a very high transconductance ~5W video amp pentode and a smaller, lower transconductance ~2W pentode in one package. The rough equivalent is the ECF200. The only drawback I can see is that the base is a noval-ish 10-pinner rather than the usual 9 pin. Appropriate sockets can be still had on E-pay. At any rate, one use I can see for these things is a flea power partial feedback amp, either for headphone duty or driving tweeters. With the right transformers, it could be an ultra-mini amp.

Last edited by wrenchone; 18th November 2013 at 02:53 AM.
  Reply With Quote
Old 18th November 2013, 02:36 AM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Do you have a decent data sheet? Is the socket the same as the double tetrode found in some H/K receivers? That item has a 10th pin at the center of what otherwise would be a routine Noval arrangement's pin circle.
__________________
Eli D.
  Reply With Quote
Old 18th November 2013, 02:49 AM   #3
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
The socket is the same as for the 6X9, with all the pins around the periphery. I've seen disjointed specs for the 6R4P which might suggest a higher power rating for the big, high conductance pentode, but if you want to be conservative, I'd use the specs for the ECF200, which can be had at the cost of a Google search. An Ebay search for "ECF200 socket" might lead you to Zhangsheng, who has some decent looking product...

Last edited by wrenchone; 18th November 2013 at 02:59 AM.
  Reply With Quote
Old 18th November 2013, 04:54 AM   #4
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
Actually, it's the EFL200 that is the rough 6R4P equivalent - sorry for the wild goose chase.
  Reply With Quote
Old 18th November 2013, 05:28 AM   #5
diyAudio Member
 
Join Date: May 2007
So there is a use for EFL200? Interesting that is
  Reply With Quote
Old 18th November 2013, 08:06 AM   #6
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
Another very similar tube is the 6Y9 (looks to be the same, really).
  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
Novar Spud :: A $200 sweep tube Spud with PCB tomchr Tubes / Valves 89 17th July 2014 10:32 PM
Tiny, tiny DC-DC converter jackinnj Power Supplies 1 28th June 2006 07:03 PM
any good tiny tiny tweeters? THOR Multi-Way 18 28th June 2004 06:42 AM
Teeny, Tiny, Microcontrolers. bigparsnip Digital Source 19 27th August 2003 01:44 PM
where to get teeny tiny drill bits? cowanrg Parts 20 2nd August 2003 06:54 PM


New To Site? Need Help?

All times are GMT. The time now is 12:31 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