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Warmer 6SN7

Posted on May 12, 2010 at 00:07:07

Hi All,

Just looking at making my MP1 Mk2.3 a bit warmer. I presently have stock standard tubes from the factory. The sound is dynamic, but very neutral through the mid range IMO.

Just wanting to add a touch of warmth and more realism to the mids (I'm mainly a mids person), absolute bass slam does not bother me. Rather my bass tight insteand of boomy.

Thanking you.


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RE: Warmer 6SN7, posted on May 12, 2010 at 08:10:02
Bored Member

Posts: 12474
Joined: July 31, 2007
May 17, 2009
My experience is the red based CBS-Hytron or RCA labeled 5692 are centered more toward the midrange (at least in the apps I've used them whcih are Ampeg combo amps of the early 1960's). This is at the expense of extended high notes. Reminds me of adding a grid stopper to the power tubes. That sort of tonal reaction. One caution, plate voltages need to be dropped, if you want those 5692 to last.

The Raytheon brown based 6SN7WGT also is centered more toward midrange and bass. I also find most NOS RCA & Sylvania 6SN7GTB's to have similar response, but not as good bass as the Raytheon 6SN7WGT.

A lot of brightness or sibilance is due to the idle bias and plate voltages applied to the tube. Plus, the types and values of the coupling caps connected to these tubes. So, response to tube rolling can be different between units. Ampeg pushed the 6SN7's used in their combos pretty hard. This is part of the contribution to that shimmering, bright tone so characteristic of songs recorded using these amps. Such as early REM, for example.


RE: Warmer 6SN7, posted on May 12, 2010 at 11:07:32
Jack Williams

Hi Che,

If you can find a non-microphonic Gray glass RCA they are just what the doctor ordered for some added warmth, richness and good extension on both ends.


RE: Warmer 6SN7, posted on May 12, 2010 at 16:19:42

Posts: 57
Location: Western Australia
Joined: July 31, 2005
Hi There,

What about the Ken Rads VT231? Or the round plate Tung Sols?

Are these a more neautral tube?

How about any of the NOS british tubes like Mullard, Cossor or Brimar? I heard these can be warm (I just dont want it overly warm as it starts to sound to slow / muddy.

Thanking you.



RE: Warmer 6SN7, posted on May 12, 2010 at 19:26:31
Bored Member

Posts: 12474
Joined: July 31, 2007
May 17, 2009
I find the older 1940's VT231 & Sylvania 6SN7W to sound more lively or shifted to the high end (in general). Not warmer. Perhaps more neutral and open sounding in the better VT231's (like the round plate TungSol).

I have not tried any of the European ECC33's.


RE: Ditto !! (nt), posted on May 14, 2010 at 01:11:48

Posts: 1851
Location: Alberta, Canada
Joined: October 24, 2004


The Tung-Sol 6SN7GT roundplate is the best-sounding, overall, 'N7..., posted on March 28, 2016 at 16:54:51

Posts: 4965
Location: Phoenix, Arizona
Joined: December 10, 2004
December 13, 2004
...man ever made. They have a richness in the lower-MR/upper-bass that sounds like real music sounds, to me and thousands of us out here.
 photo 2016 TSRPs 4_1500w_zpsfojuneca.jpg

Unfortunately they're now rather expensive as in $100 - $150 each for typical examples.

You might try Brent Jesse for those; all his tubes come with a 30-day (I think) return privilege.

Fortunately, the arrival of a recent quad plus what's left of my old cache leaves me with 19, more than a lifetime's worth.
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."


RE: Warmer 6SN7, posted on October 11, 2016 at 05:25:10

Posts: 50
Location: Mid East
Joined: July 14, 2009
My favorite :RCA 5692 red base and Sylvania VT-231.
The 5692 is the best tube for jazz vocal, warm and lush.
VT-231 I considered good for allround music, wide soundstage.

I plug those tube on my 300B single ended amp



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