Vali 2 tube rolling
Sep 25, 2018 at 9:35 PM Post #1,441 of 6,436
Gain wise, 12AU7 = lowest, 12AT7 is medium, and 12AX7 is highest. The reason these work with only 6.3 volts is they have a center tapped filament and were designed to run on either 6.3 or 12.6 volts. Can't do that with all 12 volt tubes, regardless of how the adapter is wired. For example a 12SN7 does not have a center tapped filament and was not designed to operate with 6.3 volts so the chances of it working in the Vali are pretty slim. I won't say it can't work because I've never tried it...and probably never will. :relaxed: Too bad, as 12SN7's are way, way cheaper than their 6SN7 brethren.

Haven't been brave enough to try the other 12a?7 tubes… yet. I remember reading something about the 12at7 not being interchangeable with the others on Brent Jesse though. I also think the 12ax7 runs at an even higher plate voltage than the 12au7 so it may not be optimal. Then again 6sn7s are supposed to get a way higher plate voltage than the Vali2 can dream of providing, but they still work fine…
I hear you about the 12sn7. I know a guy with a Project Solstice. He loves the cheaper 12v based tubes (who wouldn't)

What's the deal with those 7n7s you guys keep going on about over on the Lyr3 thread? If I stack enough adapters you figure they'll work in the V2:wink:
 
Sep 25, 2018 at 9:42 PM Post #1,442 of 6,436
Yea the 7N7 is loctal base, and are a lot cheaper than a 6sn7 with the same construction.
 
Sep 26, 2018 at 6:28 PM Post #1,444 of 6,436
Haven't been brave enough to try the other 12a?7 tubes… yet. I remember reading something about the 12at7 not being interchangeable with the others on Brent Jesse though. I also think the 12ax7 runs at an even higher plate voltage than the 12au7 so it may not be optimal. Then again 6sn7s are supposed to get a way higher plate voltage than the Vali2 can dream of providing, but they still work fine…
I hear you about the 12sn7. I know a guy with a Project Solstice. He loves the cheaper 12v based tubes (who wouldn't)

What's the deal with those 7n7s you guys keep going on about over on the Lyr3 thread? If I stack enough adapters you figure they'll work in the V2:wink:

As @timb5881 stated, the 7N7 is a 6SN7 with a loctal base. Electrically identical. There's a particular version of this that sounds incredible and although getting hard to find, they're still cheap if you can dig one up. I picked up my first one for $5. The long, gory saga starts here:

https://www.head-fi.org/threads/schiit-lyr-3-tube-rolling-thread.876016/page-84#post-14447101

It will work in the Vali, but I've not yet looked for a 6922 -> 7N7 adapter. Possible they're available on Ebay, otherwise you'd have to get an adapter for the adapter. :relaxed:

Good to see 'ya Mr. Trev! Been a while.
 
Sep 26, 2018 at 7:16 PM Post #1,445 of 6,436
Sep 26, 2018 at 7:23 PM Post #1,446 of 6,436
I have a couple of Foton 6SN7 - USSR 1960. They have a warm, expansive sound with crystaline mids. Excellent tubes.

Having an octal base requires an adapter to 9-pin. 6SN7/6N8P > ECC88/6922.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/201506917187

Because of the size of the adapter, a base saver/extender is also needed for use in the Vali 2.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.ca/ulk/itm/312206555329

The '60 - '65 Fotons are good (and especially for the money), but the '55 and earlier with ribbed plates are even better.

https://www.ebay.com/itm/Tested-6N8...173507?hash=item238a3dfc83:g:xmAAAOSwjpRavJ8e

upload_2018-9-26_19-21-44.png
 
Sep 26, 2018 at 7:30 PM Post #1,448 of 6,436
I have a couple of Foton 6SN7 - USSR 1960. They have a warm, expansive sound with crystaline mids. Excellent tubes.

Having an octal base requires an adapter to 9-pin. 6SN7/6N8P > ECC88/6922.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/201506917187

Because of the size of the adapter, a base saver/extender is also needed for use in the Vali 2.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.ca/ulk/itm/312206555329

Yep. I needs more adapters, lol.

6SN7GT-mouse-ears.jpg
 
Sep 26, 2018 at 8:07 PM Post #1,449 of 6,436
Sep 26, 2018 at 10:26 PM Post #1,450 of 6,436
Cool looking Mouse Ear! How's it sound in the Vali?

Quite good, actually. But (right now, anyways) I'm leaning more towards my 1975 NOS Reflektor 6N3P-E...bass seems better. Still, I currently switch out mostly between the Reflektor and the mouse-ears.
 
Sep 27, 2018 at 12:49 AM Post #1,451 of 6,436
As @timb5881 stated, the 7N7 is a 6SN7 with a loctal base. Electrically identical. There's a particular version of this that sounds incredible and although getting hard to find, they're still cheap if you can dig one up. I picked up my first one for $5. The long, gory saga starts here:

https://www.head-fi.org/threads/schiit-lyr-3-tube-rolling-thread.876016/page-84#post-14447101

It will work in the Vali, but I've not yet looked for a 6922 -> 7N7 adapter. Possible they're available on Ebay, otherwise you'd have to get an adapter for the adapter. :relaxed:

Good to see 'ya Mr. Trev! Been a while.

Popped in the Lyr 3 thread somewhere in the middle of the "Frankentube" discussion so I wasn't sure what the deal was (lurking round those Lyr threads is a good way to steal tube suggestions, far more traffic than this thread). I did a quick search on ebay for adapters. Mostly found 6sn7>7n7, but did find a 6cg7>7n7. 6cg7 has the same pinout as the 6dj8 so it'd be workable, but also runs into the issue mentioned below

I have a couple of Foton 6SN7 - USSR 1960. They have a warm, expansive sound with crystaline mids. Excellent tubes.

Having an octal base requires an adapter to 9-pin. 6SN7/6N8P > ECC88/6922.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/201506917187

Because of the size of the adapter, a base saver/extender is also needed for use in the Vali 2.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.ca/ulk/itm/312206555329

I used the need for this extra adapter to my advantage and got a 12au7 adapter to double as an extender and bought a 12au7>6sn7 for the big boys (yes, that's right. I'm going 6 to 12 and back to 6 again:dizzy_face:).
One of these days, I'm going to get a piece of metal and make a new cover for the amp. Make the opening for the tube big enough for a 6sn7 adapter to fit directly. I find my 6sn7s can pick up some noise at times and I think having to stack adapters my be part of the problem (plus it just looks funny)

Yep. I needs more adapters, lol.


My complaints aside… can't have too many adapters:wink:
 
Sep 27, 2018 at 8:10 AM Post #1,452 of 6,436
My complaints aside… can't have too many adapters:wink:

That would be like having too much money, or too many tubes. Neither are possible. :relaxed:
 
Sep 27, 2018 at 3:05 PM Post #1,453 of 6,436
That would be like having too much money, or too many tubes. Neither are possible. :relaxed:

Too many tubes would be a judgment call. You've posted pics of your stash, that's quite the burden. In fact, so much so that I'm worried about you. You should let me shoulder some of your burden:wink:
 
Oct 22, 2018 at 5:46 AM Post #1,454 of 6,436
Hello dear Headphone experts,

2 years ago i bought myself a pair of used AKG Q701 and Soundblaster Z soundcard, over the last months i found out that the soundcard was limiting my headphones and so i started searching for a good DAC/AMP combo with a good bang for the buck.
Right now i narrowed it down to a Modi paired with a Vali 2. My question now is:

I have been reading a lot about how my headphones sound with the Vali 1 and the Vali 2. It seems like the Vali 1 would be the better match, as it warms up the headhphones quiet a bit more than the Vali 2 does.
So i thought about tube rolling the Vali 2.
I also put a bit of time into searching through some tubes and ended up with this one:

PCC88 / 7DJ8 NOS

Does anyone know if this fits my expectations? I am mainly listening to Electronic Musik (Techno, Drum´n´Bass, etc) but also enjoy myself some Indie or Alternative.
I want my AKGs to sound alive and enhance their bass a bit, as they seem a bit to neutral for me, when driven with my old soundcard.

Would gladly appreciate any tips or answers and hope i can finally by my first real set up. :)

Thanks already and hope my english is sufficient as I´m from Germany!

I already posted this in the vali 2 thread, but stumbled across this one just yet.

With kind regards,

Timo :)
 
Oct 22, 2018 at 9:21 AM Post #1,455 of 6,436
Hello dear Headphone experts,

2 years ago i bought myself a pair of used AKG Q701 and Soundblaster Z soundcard, over the last months i found out that the soundcard was limiting my headphones and so i started searching for a good DAC/AMP combo with a good bang for the buck.
Right now i narrowed it down to a Modi paired with a Vali 2. My question now is:

I have been reading a lot about how my headphones sound with the Vali 1 and the Vali 2. It seems like the Vali 1 would be the better match, as it warms up the headhphones quiet a bit more than the Vali 2 does.
So i thought about tube rolling the Vali 2.
I also put a bit of time into searching through some tubes and ended up with this one:

PCC88 / 7DJ8 NOS

Does anyone know if this fits my expectations? I am mainly listening to Electronic Musik (Techno, Drum´n´Bass, etc) but also enjoy myself some Indie or Alternative.
I want my AKGs to sound alive and enhance their bass a bit, as they seem a bit to neutral for me, when driven with my old soundcard.

Would gladly appreciate any tips or answers and hope i can finally by my first real set up. :)

Thanks already and hope my english is sufficient as I´m from Germany!

I already posted this in the vali 2 thread, but stumbled across this one just yet.

With kind regards,

Timo :)
The 7DJ8 is a good tube. Most are Telefunken directly, or Ei versions. Ei purchased the dies from Telefunken, and so they are more or less the same.
 

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