Audiokarma.org
Audiokarma Featured Sponsor

Go Back   AudioKarma.org Home Audio Stereo Discussion Forums > Tube Audio


We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 11-05-2010, 09:26 PM
gadget73's Avatar
gadget73 gadget73 is online now
AK Member
 
Join Date: Dec 2006
Location: Southern NJ
Posts: 17,223
807 vs 6L6 as an output tube

Does anyone have input on the sound of an 807 vs the 6L6GC ? I'm possibly looking at buying a mate to my Stancor Williamson amp, and its been modded to take a 6L6. I have one thats still fitted with the original 807 tubes. If I did get this, I'd probably be buying 4 tubes of either type but I'm looking for thoughts on which type to buy. I'm sort of leaning towards the 807 for price and the fact it has that cool plate cap, but should I really consider a 6L6GC or a KT66 or something ?


http://www.pmillett.com/file_downloa...schematics.pdf

the second set of schematics for the amp in ultralinear mode is what I'm working with.
__________________
solid stuff, tube stuff, its all good stuff
Reply With Quote
  #2  
Old 11-05-2010, 09:34 PM
jaymanaa's Avatar
jaymanaa jaymanaa is online now
4409
 
Join Date: Mar 2006
Location: OZ
Posts: 46,880
Just my ears but I'll take a 6L6 over an 807 / 1625 every time. They sound better to me, and seem to be much more durable.
__________________
The tree of Liberty must be refreshed from time to time.
With the blood of Tyrants.
Reply With Quote
  #3  
Old 11-05-2010, 09:41 PM
battradio's Avatar
battradio battradio is offline
AK Member
 
Join Date: Mar 2009
Location: Near ST. Louis MO
Posts: 3,919
Hi ,

I would consider the 6BG6 , wire both chassis for these they are reasonabled .

http://www.vacuumtubes.com/6BG6.html .

Your would have the advanages of the 6L6GC with the price of the 807 .
__________________

I just hate that when you wake up and find out you are Conti the brain damaged robot and even worse than that the perfect audio system you had is gone !
Mark
Reply With Quote
  #4  
Old 11-05-2010, 09:44 PM
gadget73's Avatar
gadget73 gadget73 is online now
AK Member
 
Join Date: Dec 2006
Location: Southern NJ
Posts: 17,223
moot point, had a login issue and ended up missing out on it. There are days where I truly despise technology. Stupid login timeouts.
__________________
solid stuff, tube stuff, its all good stuff
Reply With Quote
  #5  
Old 11-06-2010, 02:22 AM
Sam Cogley's Avatar
Sam Cogley Sam Cogley is offline
Last of the Time Lords
 
Join Date: Dec 2008
Location: SW Missouri
Posts: 22,596
Quote:
Originally Posted by jaymanaa View Post
Just my ears but I'll take a 6L6 over an 807 / 1625 every time. They sound better to me, and seem to be much more durable.
I wonder how, since the 807/1625 is just a higher-voltage 6L6.
__________________
Growing up leads to growing old and then to dying,
And dying to me dont sound like all that much fun...
-John Mellencamp

Burn the land and boil the sea...you can't take the sky from me.
-Joss Whedon
Reply With Quote
Audiokarma
  #6  
Old 11-06-2010, 05:52 AM
seta1 seta1 is offline
AK Member
 
Join Date: Mar 2009
Location: North Florida
Posts: 632
[QUOTE=gadget73;4120030]Does anyone have input on the sound of an 807 vs the 6L6GC ? I'm possibly looking at buying a mate to my Stancor Williamson amp, and its been modded to take a 6L6. I have one thats still fitted with the original 807 tubes. If I did get this, I'd probably be buying 4 tubes of either type but I'm looking for thoughts on which type to buy. I'm sort of leaning towards the 807 for price and the fact it has that cool plate cap, but should I really consider a 6L6GC or a KT66 or something ?
/QUOTE]

The problem with the 807 is that it is no longer made while the 6L6 is still in production. Although vintage 807's are not priced in the stratosphere yet, it will only be a matter of time before their prices go crazy. The 6L6 sounds great and is as good or better sounding then the 807. The 807, though, looks cooler.
As for the KT66, it is NOT a drop in replacement. It's filament current is half again the filament current of a 6L6. This can be fatal to certain amplifier's power transformers. This is especially true with vintage amps which normally have power transformers that are just adequate with no reserve capacity. Can't tell you how many Fender guitar amps I have had to replace power transformers in because someone decided to cram a set of KT66's in place of the correct 6L6GC's. Also, the 6L6GC is a 30 watt plate dissipation tube while the KT66 is rated at 25 watts. The KT66 is what is called a "Kinkless Tetrode" while the 6L6 is a beam pentode. Just remember that for every pair of KT66's used in an amp, you need 1 amp more filament current then what you would for a pair of 6L6's.
__________________
Scott 340, Dynaco PAS2, ST70, FM1, Scott LC21, Scott 299C.
several of my own power amps and preamps.
Reply With Quote
  #7  
Old 11-06-2010, 07:20 AM
sebrof's Avatar
sebrof sebrof is offline
AK Member
 
Join Date: Nov 2009
Location: Austin TX USA
Posts: 2,001
I have an amp that was designed for the 6L6, and I got adapters so I can drop in 807s. RCA NOS 807s are dirt cheap and to me sound much better than the new production EH 6L6s that came with the amp. Also better than an old pair of 6L6s (Sylvaina??), but I'm not sure of the history of that pair, they may be spent.
As far as durability - My understanding is that the 807 is one of the most durable tubes on the planet (as far as audio output applications), having been designed as an RF transmitter tube and made mostly for the military. I've read stories of people in the Ham Radio world pushing them way way beyond their rating and running them that way for years.
I believe that any amp that takes 6L6s will take the 807 with the adapters. $50 for the adapters, and NOS in the box 807s will run you about what a pair of new production EH 6L6s will.

Last edited by sebrof; 11-06-2010 at 07:28 AM.
Reply With Quote
  #8  
Old 11-06-2010, 07:31 AM
jon_s's Avatar
jon_s jon_s is offline
AK Member
 
Join Date: Aug 2005
Location: Florida
Posts: 1,091
Quote:
Originally Posted by seta1 View Post
. The KT66 is what is called a "Kinkless Tetrode" while the 6L6 is a beam pentode.
Fortunately they both mean the same thing, just different marketing
Reply With Quote
  #9  
Old 11-06-2010, 07:42 AM
ducati_EL34's Avatar
ducati_EL34 ducati_EL34 is offline
AK Member
 
Join Date: Feb 2007
Location: In front of a pair of speakers.
Posts: 3,323
Quote:
Originally Posted by sebrof View Post
As far as durability - My understanding is that the 807 is one of the most durable tubes on the planet (as far as audio output applications), having been designed as an RF transmitter tube and made mostly for the military. I've read stories of people in the Ham Radio world pushing them way way beyond their rating and running them that way for years.
Well Amateur radio operators are not worried about high fidelity, just a clean 800Hz CW tone...

Along those lines, there is a guy who builds old CW transmitters, 1929 vintage, and use 45 tubes for the finals. He says he buys "weak" ones from the hi-fi guys, who no longer find them fit for hi-fi grade audio...
__________________
“I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day.” -- Frank Sinatra

Last edited by ducati_EL34; 11-06-2010 at 08:30 AM.
Reply With Quote
Reply


Thread Tools
Display Modes

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


All times are GMT -5. The time now is 05:30 PM.



Friends of Audiokarma
We appreciate your help in keeping this site going.
Wargos Electronics
Amps and Sound
Black Swamp Audio
Organ Donor Parts
Sonneteer
Parts Connexion
Sound Stage Direct
Atlantic Systems
AudioClassics
Take Five Audio
AV Solutions
Audio Salon
Tone Arm Audio
Audience AV
Musical Paradise
Simply Speakers
Classic Sound Repair
BD Enterprise
McIntosh Cabinets
Howard Products
Cabledyne
FM DX Antenna
BOI Audio Works
Siliconray
Amplifiedparts
Vinyl Magic Record Cleaner
RSL Speakers
Grant Fidelity
Salk Sound
Yesterday's Audio
Urban Antigue Radio
DeWick Repairs
Many Moons Audio
Vintage Electronics Repair
The Tube Store
Politicalchat.org
Audio Doctor
Antique Radio Classifieds
MCM Electronics
Videokarma.org
Herbies Audio Lab
 
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
©Copyright 2002-2014 AudioKarma.org, All rights reserved.