6DJ8/6922 rolling... any general consensus on these? - 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 10th April 2011, 04:19 AM   #1
Dylan is offline Dylan  United States
diyAudio Member
 
Dylan's Avatar
 
Join Date: Aug 2004
Location: Oregon, USA
Default 6DJ8/6922 rolling... any general consensus on these?

I picked up a handful of tubes to play with in my new (and first) DIY amplifier, based on the Van Waarde 6DJ8+6AS7 OTL headphone amp. I got these for $5 a piece (braggart!) at a local antique mall, so how could I go wrong grabbing a bunch of brands to try?!

Here's what I picked up:

Amperex "Bugle Boy" 6DJ8/ECC88 (three of them)
Amperex plain white label 6DJ8/ECC88
Amperex "Orange Globe" JAN-6922 (Gold Pins)
Sylvania Green label JAN-6922 (Steel pins). There's a whole jar of these available if I want more.

All test good.

So how would you guys rank these tubes? I'm a newbie to critical tube listening, so I don't know quite how to describe them.

I personally am torn between the Amperex vs. Sylvania 6922. The Amperex seems a little more detailed, but almost too much? It seems there's not a thing in the signal path that doesn't get through this tube. The Sylvania is nice, with a bit less "edge." The Bugle Boys seem to have a quality I can't put my finger on, similarly for the plain white label. I seem to keep going back to the BBs.

I know it's ultimately up to what I like, but I was curious about other opinions given the huge selection (and prices!) of these tubes out there.

By the way, what's the usual going price on the Sylvania Green 6922? If anyone wants a few to play with without paying the $50 everyone seems to want, I could grab the rest of that jar I saw and pass them on for a bargain price.

Last edited by Dylan; 10th April 2011 at 04:32 AM. Reason: Because I could.
  Reply With Quote
Old 11th April 2011, 06:33 AM   #2
Dylan is offline Dylan  United States
diyAudio Member
 
Dylan's Avatar
 
Join Date: Aug 2004
Location: Oregon, USA
I just learned a lesson that might be helpful to other amp building newbies.

Don't immediately assume your design is perfect because it worked the first time, and that certain tubes you try later are "noisy."

I was about to can the Amperex 6922 as an option because I always heard an incredibly faint, but noticeable hum, but only when using that tube. I decided to open up the amp and do some poking around, because surely a tube wouldn't hum like that?

Turns out my amp likes the heater supply ground tied to B+ ground. Until now it had been floating. No more noise whatsoever, and the Amperex 6922 is finally getting a proper listen. It might become a favorite.

Last edited by Dylan; 11th April 2011 at 06:37 AM.
  Reply With Quote
Old 11th April 2011, 10:45 AM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Small differences in operating points will swamp any differences between those tube brands. Get the topology right, get the operating point right, and the tube brand won't matter very much except to collectors.

One other thing- layout. I had tried a particular ECC88 variant some years ago and found it to be noisy and microphonic compared to most of the others. All the others seemed fine. I stuck them back in my tube box and there they sat for 25 years. In the meantime, I had learned a few tricks; I pulled them back out of the box and tried them again. Dead quiet. The difference was their propensity to oscillate- they needed more effective grid-stopping than my old design provided.
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  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
FS tubes 6922/ECC88/6DJ8 merlin el mago Swap Meet 10 26th October 2010 09:47 AM
6N1P for buffer instead of 6DJ8, 6922 JojoD818 Tubes / Valves 39 28th April 2010 12:17 AM
Morgan Jones and the ECC88/6922/6DJ8 rknize Tubes / Valves 75 18th April 2010 09:35 PM
6DJ8 / 6922 tube? nordhaven Tubes / Valves 25 27th April 2008 08:07 PM
WTB: 6DJ8 / ECC88 / 6922 Tubes mrdon Swap Meet 0 6th September 2005 09:58 PM


New To Site? Need Help?

All times are GMT. The time now is 09:23 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