[Old Deaf Donkey]

If a tree falls in the woods....

I thought it was about the bear?

 

[emorrison33]

I've always found it funny how much the headphones stretch the frequency response spec, even though they are by far the least linear component in a system.

Even though you say you are making up numbers, there are plenty of headphones which stretch them farther, Sennhieser specs the frequency response of the HD 800S all the way down at -10dB!

In the human range of 20-20khz you typically get frequency response variations of <0.1 db from a DAC or amplifier, so 10 dB is huge.
IMO it would be nice if the headphone makers gave you the max deviation within our actual hearing range.

Specifically, the Grado GS1000e specs quote 8-35,000hz

 

[bl4scott]

Any recommendations on a dual 6sn7 to 6922 adapter? I have seen some but not found where to purchase.

Thx Brian

 

[bcowen]

Any recommendations on a dual 6sn7 to 6922 adapter? I have seen some but not found where to purchase.

Thx Brian

Do you mean by chance a dual 6J5 to 6922 adapter? A 6SN7 is a dual triode like a 6922 so you only need one. Besides that, two 6SN7's would pull 1.2 amps of heater current. A 6922 pulls 300 milliamps, and a 6SN7 pulls 600 milliamps. Single 6SN7's (replacing the 6922 with an adapter) have been used in Valis with no problem, but I wouldn't even attempt two 6SN7's as you'd likely fry the amp in the process.

 

[bl4scott]

Do you mean by chance a dual 6J5 to 6922 adapter? A 6SN7 is a dual triode like a 6922 so you only need one. Besides that, two 6SN7's would pull 1.2 amps of heater current. A 6922 pulls 300 milliamps, and a 6SN7 pulls 600 milliamps. Single 6SN7's (replacing the 6922 with an adapter) have been used in Valis with no problem, but I wouldn't even attempt two 6SN7's as you'd likely fry the amp in the process.

That is good to know. Have my first set of matching 6sn7 and thought I would give them a spin. I guess. I will need to wait for a different amp in the future.

 

[Old Deaf Donkey]

Do you mean by chance a dual 6J5 to 6922 adapter? A 6SN7 is a dual triode like a 6922 so you only need one. Besides that, two 6SN7's would pull 1.2 amps of heater current. A 6922 pulls 300 milliamps, and a 6SN7 pulls 600 milliamps. Single 6SN7's (replacing the 6922 with an adapter) have been used in Valis with no problem, but I wouldn't even attempt two 6SN7's as you'd likely fry the amp in the process.

Two 6J5 or two 7A4 in respective adapters to 6922 also work extremely well in Vali 2, as you hinted

 

[bcowen]

That is good to know. Have my first set of matching 6sn7 and thought I would give them a spin. I guess. I will need to wait for a different amp in the future.

You can easily find a 6922 --> (single) 6SN7 adapter. You might very much enjoy the 6SN7 in the Vali. Just 'cause you got a pair doesn't mean you have to use both of them at the same time. In fact, @Deyan makes a very nice adapter that's in one piece so that you don't need a socket saver/extension to reach the Vali's internal socket. The one below has a 7N7 socket on top, but I'm sure he can do the same thing with an octal socket for a 6SN7. Just PM him if interested.

 

[RushNerd]

You can easily find a 6922 --> (single) 6SN7 adapter. You might very much enjoy the 6SN7 in the Vali. Just 'cause you got a pair doesn't mean you have to use both of them at the same time. In fact, @Deyan makes a very nice adapter that's in one piece so that you don't need a socket saver/extension to reach the Vali's internal socket. The one below has a 7N7 socket on top, but I'm sure he can do the same thing with an octal socket for a 6SN7. Just PM him if interested.

Wow, that right there looks like a huge upgrade for the Vali 2! Any advantage to using a tube like that over smaller ones? I would be all in if the adapter is easy enough to find.

 

[Deyan]

Wow, that right there looks like a huge upgrade for the Vali 2! Any advantage to using a tube like that over smaller ones? I would be all in if the adapter is easy enough to find.

It's pretty easy - you just contact me.

 

[bcowen]

Wow, that right there looks like a huge upgrade for the Vali 2! Any advantage to using a tube like that over smaller ones? I would be all in if the adapter is easy enough to find.

The 7N7 Frankentube (specific internal construction details) is one of my most favorites in the Vali 2. And they can still be had for cheap (comparatively), just have to keep an eye out for them. Another HeadFi member just picked one up yesterday for $15. And definitely get the adapter from @Deyan . I'd bet he still has the specs for the one he made for me, but if not I'll be happy to re-send him the measurements.

 

[bochawa]

The 7N7 Frankentube (specific internal construction details) is one of my most favorites in the Vali 2. And they can still be had for cheap (comparatively), just have to keep an eye out for them. Another HeadFi member just picked one up yesterday for $15. And definitely get the adapter from @Deyan . I'd bet he still has the specs for the one he made for me, but if not I'll be happy to re-send him the measurements.

Ha, someone else beat me to that frakentube - too slow on my part. In other news, I can confirm that the ebay xulingmrs 7N7 to ECC88 6922 6CG7 adapter works just fine in the Vali 2, though a socket saver is required unless you have enlarged the hole in the metal cover as I have done.

 

[bl4scott]

It's pretty easy - you just contact me.

My adapter was made by Deyan and it was 100% quality work. I would highly recommend using him.

 

[Mr Trev]

So finally after 2 weeks of being stuck in the no-mans land of the Canada/US border, my tubes arrived.
First up: Gold pin Matsushita (Realistic branded) 6BQ7.
Inserted tube… turned on the amp. No smoke, didn't have to pick shards of glass out of my face. So far, so good. Plug in my earphones… holy ringy thing. Tap the tube, rings. Tap the Vali case, rings. Flick the gain switch, hisses and rings. Not a tube for my BA iems.
So I switch to my 400i, ringing is still there, but at least I don't hear the hissing on high gain. How does it sound… crisp and detailed. Not exactly what I'd consider tube like. Granted I only have a couple hours on it, so hopefully things will settle in - especially that ringing.

 

[Mr Trev]

Here's the little guy in action:

Kinda funny looking actually. Is the tube half-empty or half-full?

 

[bcowen]

Here's the little guy in action:


Kinda funny looking actually. Is the tube half-empty or half-full?

You could always increase its stature.