[Beestonite]

The Darkvoice 336se uses a 6N8P natively which is similar to a 6SN7. The 6N7 has a different pinout than the 6SN7, so an adapter would be required at minimum. The 6N7 also draws much higher heater current than the 6SN7 (or 6N8P), so even with an adapter it may be very risky to use depending on the max current the DV can handle safely.

Thank you very much for that information, you may just have saved me a lot of problems.

 

[adhoc]

I came out of retirement to say that unless a 6n7 is specified by your amp manufacturer as a drop in replacement for a 6sn7 (highly unlikely), it is NOT compatible.

It's operating characteristics are different, and as mentioned above it's pin configuration is different..

 

[bcowen]

I came out of retirement to say that unless a 6n7 is specified by your amp manufacturer as a drop in replacement for a 6sn7 (highly unlikely), it is NOT compatible.

It's operating characteristics are different, and as mentioned above it's pin configuration is different..

Retirement? I want that job. Where do you get an application?

 

[Beestonite]

I came out of retirement to say that unless a 6n7 is specified by your amp manufacturer as a drop in replacement for a 6sn7 (highly unlikely), it is NOT compatible.

It's operating characteristics are different, and as mentioned above it's pin configuration is different..

Thank you for coming out of retirement to help out a newbie . Any contributions and recommendations are always appreciated.

 

[ScubaMan2017]

I came out of retirement to say that unless a 6n7 is specified by your amp manufacturer as a drop in replacement for a 6sn7 (highly unlikely), it is NOT compatible.

It's operating characteristics are different, and as mentioned above it's pin configuration is different..

Newcomers like us appreciate you surfacing and giving us fair warning about just plopping any-old tube into our gear. This thread, while old, is still used by us. Thanks, @adhoc .

 

[sennfan83261]

Can anyone help me id the year of this Sylvania 6SN7GT (date codes: 939 and J8A)? I thought it was 1959, but then I read somewhere that 6SN7GT's were already phased out by then. Also, is there a guide for lettered date codes for Sylvania tubes? I found a reference guide for RCA tubes but came up empty for Sylvania tubes. Thanks!

 

[Ripper2860]

The code on the base seems to indicate 1949 (39th week). The 8 on the top J8A code seems to indicate 1948 tube MFG. The thing about tubes is the glass envelopes are mfg separately from the base and sometimes are not mated to a base until a later time. Sometimes the labeling on the base does not even match the tube markings (ex: I have a 6SN7W in a 6SN7GT base). Your's seems to be a tube made in 1948 and mounted to a base in 1949. Some believe the top J is a factory code, but there does not really seem to be a consensus. Seems like they stopped etching top tube codes after the 40's as all my Sylvies with top tube codes are from the 40's.

 

[cddc]

subscribed

 

[jambaj0e]

So I just got these Ken-rad vt-231 black glass tube for my Schiit Lyr 3 hybrid tube amp, except it doesn't say Vt-231 anywhere. It seems to have the typical physical attributes of this tube based on head-fi's 6SN7 Identification guide thread (Black glass, black flat plates with ladder riding, rectanglular mics with 3 spikes and line of small holes down the middle of the mica).

What do you guys think? Did I get screwed on this, or is this non-vt-231 sound the same as the Vt-231?

My system is USB audio to Chord MOJO Dac to Schiit Lyr 3 hybrid tube Amp to Audeze LCD-2C.

 

[Old Deaf Donkey]

It is a Ken-Rad made tube, from the top mica, and the plates are staggered. As for the rest - if it sounds great to you, that's alright , if not - well. IMHO nothing in the tube's looks gives a 100% guarantee of good sound. I have two identical structure KR 6C8G, both measure well on a tester, and one starts sounding like crap on higher load, whilst the other sounds divine. Go figure.

 

[jambaj0e]

It is a Ken-Rad made tube, from the top mica, and the plates are staggered. As for the rest - if it sounds great to you, that's alright , if not - well. IMHO nothing in the tube's looks gives a 100% guarantee of good sound. I have two identical structure KR 6C8G, both measure well on a tester, and one starts sounding like crap on higher load, whilst the other sounds divine. Go figure.

Well it does sound great, actually, especially the smooth mids. The numbers on the side, what do they refer to? It says in a vertical line "P 4 R" to the left of Kenrad, and "M-R" to the right of Kenrad.

 

[Old Deaf Donkey]

Well it does sound great, actually, especially the smooth mids. The numbers on the side, what do they refer to? It says in a vertical line "P 4 R" to the left of Kenrad, and "M-R" to the right of Kenrad.

As I recall, P would be April (second set of month numbering starting from L, O and Q omitted not to confuse with 0) and 4 1944. No idea about the rest.

 

[jambaj0e]

UPDATE: So TCtubes.com acknowledge that the tube listing was mislabeled as VT-231 and gave me a discount of $15. Now that's what I called really good customer service. I'm probably going to stick with this KenRad, especially since it doesn't have the buzzing, microphonics , or any other issues that I read that some of the Kenrad Black Glass may have.

Thank TCTubes! =D

 

[attmci]

So I just got these Ken-rad vt-231 black glass tube for my Schiit Lyr 3 hybrid tube amp, except it doesn't say Vt-231 anywhere. It seems to have the typical physical attributes of this tube based on head-fi's 6SN7 Identification guide thread (Black glass, black flat plates with ladder riding, rectanglular mics with 3 spikes and line of small holes down the middle of the mica).

What do you guys think? Did I get screwed on this, or is this non-vt-231 sound the same as the Vt-231?

My system is USB audio to Chord MOJO Dac to Schiit Lyr 3 hybrid tube Amp to Audeze LCD-2C.

These are authentic Kentucky-Radio according to the structure.

 

[jambaj0e]

Tube rolling time! I just got this Sylvania 6SN7GT tube, and the seller says it is the Bad Boys 3-rivet, but from 1950.

So far it sounds good, even cleaner sounding than my Kenrad 6SN7GT Black Glass, but with just about the same bass, give or take, possibly not as low of an extension, but the same rumble. It may sound slightly more forward, slightly less sound stage.

Can someone verify that this is the Sylvania Bad Boy? What's the fuzzyness at the top of the glass? Anything to worry about? It says "039" vertically down the side of the black part