Help! Tube Rolling - 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 1st February 2010, 05:29 AM   #1
diyAudio Member
 
Join Date: May 2008
Default Help! Tube Rolling

Hello everyone:
I have a Chinese valve amp and need some help to choose some better quality tubes/valves.
I need alternatives for: 6J4P. (An alternative could be 6SJ7 or RCA 5693 Red),
And:- 6N7P.
I can get original Chinese tubes...but an upgrade would be nice.
Any suggestions?
Thanks.
Dave
  Reply With Quote
Old 1st February 2010, 07:47 PM   #2
diyAudio Member
 
Join Date: May 2007
A closer replacement for Chinese 6J4P is the 6AC7, should not be hard to find.
The 6J4P has much higher transconductance than 6SJ7, 9000 umhos vs 1650 umhos, 6SJ7 would still work but not optimal. Only warning about 6AC7, as they were designed as a wideband amplifier, not audio amp, some can be a bit microphonic, be prepared to try a few in order to get a good pair.
  Reply With Quote
Old 3rd February 2010, 05:29 AM   #3
diyAudio Member
 
Join Date: May 2008
Thanks 'radiotron'. I'll certainly follow-up your recommendation. 6AC7 are indeed around and offer some options for improvements in sound. The 6N7P on the other hand has some options as an alternative is an ECC31. Whoa, there's a few options there...some are quite classic, and therefore expensive and worth more than the poor amp! A pair of globe type would be gorgeous! But we don't use valve amps for looks do we?
Thanks and Kind Regards:
Dave
  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
Tube rolling causes failure... Zap Tubes / Valves 10 3rd August 2008 04:04 AM
Engineering vs tube rolling Tubes4e4 Tubes / Valves 52 5th June 2008 09:30 AM
tube rolling Blue Circle BC 21 preamp sunseeker Tubes / Valves 0 27th February 2005 03:41 PM
Audio Research CA-50 tube rolling Tube Addict Tubes / Valves 6 20th October 2004 01:06 PM


New To Site? Need Help?

All times are GMT. The time now is 04:15 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