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I am copying a response I just gave listing tube combinations that I like in case anyone else may find it useful.
Here's a list of tube combinations for the Dark Voice that I like. Obviously different people have different tastes....so for what it's worth, here's the list (with pics)
A. With power tubes Tung Sol 7236 (better) or Tung Sol 6AS7G:
1. National Union (CNU 6SN7GT) Grey Glass
2. RCA VT231—Grey Glass
3. Ken Rad VT231—Black Glass Staggered plates
4. Sylvania 6SN7w
5. Sylvania 6SN7GT “Bad Boy” (1952 vintage, bottom getter)
6. Brimar 6SN7GT Black base
7. Brimar CV1988 Brown base
8. Tung Sol 6SN7GT Round plates
B. With power tubes Sylvania Gold Brand 6080 or Tung Sol 5998/2399
1. Sylvania VT231
2. Raytheon VT231
3. Raytheon 6SN7-W-GT Brown Base
4. Tung Sol 6SN7GT—Mouse Ears
5. Tung Sol 6SN7WGTA Brown Base
6. CBS 5692 Brown Base
7. Sylvania 6SN7GTA (“chrome dome”)
8. Sylvania 6SN7GT (1950’s vintage, bottom getter)
Thanks for this post! Is the Tung-Sol 6SJ7GT compatible with the 336SE?
Hi. First of all... great screen name. I actually thought I had an error message when a saw a notification that I got a message from "internal..."
In response to your question: Definitely not. Completely different tube with a much higher gain. The 6j is a single pentode and the 6n is a twin triode. Different pin outs.
There are a number of tubes that you can sub for the 6sn7 with various adapters. I've tried a 12ax7 to 6sn7, a 6cg7 (the mini 9 pin version of the 6sn7) to 6sn7, a 12au7 to 6sn7 and a 6f8g or 6c8g to 6sn7. Wasn't crazy about the 12ax7 or 12au7 with adapters in the DV. The 6cg7 is an interesting tube. Most of the ones I tried were too bright, but I have a mullard and Amperex that sound fantastic.
The 6f8g was the tube prior to the 6sn7. I've just recently gotten into these tubes and they are quite impressive. Some people (with way more knowledge than me) claim they are better than the 6sn7. I have a Tung Sol VT99 (Military version of the 6f8g) that is the same tube as the famed 6sn7gt round plates. IMO, the vt99 is a better tube. The national union 6f8g is also amazing. Prices for the 6f8g tubes are generally much lower than the equivalent 6sn7 tubes (the adapter is only about $15). I got the Tung Sol VT99 (nos) for $25 a year ago. Unfortunately that particular tube has skyrocketed in the past year.. but you can still get them much less than the 6sn7 (plus they are gorgeous to look at).
Also worth noting, the 6f8g adapter will also work with a 6c8g. These tubes are even cheaper. Look for the national union JAN version (I just picked up a NOS for $15 shipped that sounds better than the NU grey glass in my photo above that cost me $70 for NOS). Another great 6c8g is the RCA round plates (also just got that NOS for $20 shipped).
I'll try to post pics of these when I can.
Thanks for your time and attention -much appreciated!!
Are these listed in your order of preference? Or are they in no particular order?
No particular order. My favorite combination is the Brimar cv1988 with the 7236.
i have the tung sol in the first pic and the tung sol with the mouse ears. It produces the sweetest mid range ive ever heard so far in my dark voice journey. thats using the hd6xx.
Insane collection dude. Nice.
Thanks! Hope it was helpful. Saw your posts on headfi. Good stuff