[bdjul]

Finally I've changed all the tubes.
It is not better sound. It is different amp.
Someone told that Viva can't drive Susvara….
I think with all the different tubes it is perfect companion
It is hard to want more

Did you try to replace fuse?

 

[bdjul]

IMHO the issue with tube rolling on this amp is that it is using 5u4gbeh that is different than common 5u4g, same goes for 6sn7gtb and 6n1p-ev. So common substitutes (5u4g, 6sn7, 6n1p) have slightly different specs.

 

[Leo246]

Did you try to replace fuse?

Not. Any suggestions?

 

[Leo246]

IMHO the issue with tube rolling on this amp is that it is using 5u4gbeh that is different than common 5u4g, same goes for 6sn7gtb and 6n1p-ev. So common substitutes (5u4g, 6sn7, 6n1p) have slightly different specs.

I don't know about specs, but sound is significant different with different tubes. Incl. 845.

 

[bdjul]

Not. Any suggestions?

I was just curious. I’m using a stock one, but would like to try synergetic research purple or master fuse in the future. I changed 845 tube for linlai, next I’m going for 6n1p and 6sn7, and then fuse and powercord. So thank you for sharing your experience with tube rolling. There is no much info on this subject.

 

[Puroplatino]

I use both Utopia and Lcd4 and Abyss, with Viva making no difference, you can use any headset and will always play at its maximum quality. Attention to the game of the valves, the amplifier responds decisively.
On the right of picture, a Western Electric replica by Psvane, amazing upgrade if you use orthodynamic headphones, nothing will be more like before!!!

Is there any way to darken the sound so it sounds more tubey by changing the tubes? I heard it’s very linear and was interested just how dark it can get by changing the tubes. Thanks for your help.

 

[Puroplatino]

New fire bottles

Do those color the sound a bit?

 

[donato]

Is there any way to darken the sound so it sounds more tubey by changing the tubes? I heard it’s very linear and was interested just how dark it can get by changing the tubes. Thanks for your help.

I would say that yes, the amp is responsive to some changes in tonal balance based on tube changes. Probably easiest/most effective to do with rolling the 6sn7.

 

[donato]

Do those color the sound a bit?

I haven't gone back to any other 845 tube since I purchased the Elrogs, so I don't really remember all the detailed diffeerences. I don't think "color" is the word I would use though for the Elrogs, more on the sense of space and the detail were both improved. Again, it's been quite awhile since I've used another 845.

 

[visi77]

Do those color the sound a bit?

They make the background blacker if you consider that colouring

 

[biscottino]

Is there any way to darken the sound so it sounds more tubey by changing the tubes? I heard it’s very linear and was interested just how dark it can get by changing the tubes. Thanks for your help.

I remember very clearly that the rectifier valves changed the sound more than all the others. At the time I worked hard to have a more material, powerful and less detailed sound for my Focal Utopia, and I succeeded with a pair of rectifiers.

 

[donato]

I remember very clearly that the rectifier valves changed the sound more than all the others. At the time I worked hard to have a more material, powerful and less detailed sound for my Focal Utopia, and I succeeded with a pair of rectifiers.

Do you have a recommendation on rectifier tubes? I was running sovtek 5u4g (not gb) and liked the sound of those, but the flash in them every time I powered them on was a bit disconcerting. I had some JJ tubes which sound pretty boring and flat. I have some NOS RCA 5u4gb coming so I'm hopeful those will be better. I am also curious about the Sylvania 5931.

Otherwise, I'm still very satisfied with 1960s vintage Melz 1578 for 6sn7 and Elrog 845. With many other 6sn7 (e.g.TS BGRP, RCA red base, some vintages of melz, etc.) I found the bottom end to be too rolled off (I'm using Susvara). Only the 1960s Melz and some Sylvania chrome tops (don't recall exactly which) seemed to keep the lower end of freq range intact.

I did also order some different vintages of Voskhod rocket 6n1p-ev so I'll have to see if those make any difference. I did once try a black square anode 6n1p (non ev) and that rolled off bottom and top ends and dynamics, so definitely no go.

I'd really be interested to hear what specific tubes others find to work well.

 

[biscottino]

Do you have a recommendation on rectifier tubes? I was running sovtek 5u4g (not gb) and liked the sound of those, but the flash in them every time I powered them on was a bit disconcerting. I had some JJ tubes which sound pretty boring and flat. I have some NOS RCA 5u4gb coming so I'm hopeful those will be better. I am also curious about the Sylvania 593.1

Otherwise, I'm still very satisfied with 1960s vintage Melz 1578 for 6sn7 and Elrog 845. With many other 6sn7 (e.g.TS BGRP, RCA red base, some vintages of melz, etc.) I found the bottom end to be too rolled off (I'm using Susvara). Only the 1960s Melz and some Sylvania chrome tops (don't recall exactly which) seemed to keep the lowere end of freq range.

I did also order some different vintages of Voskhod rocket 6n1p-ev so I'll have to see if those make any difference. I did once try a black square anode 6n1p (non ev) and that rolled off bottom and top ends and dynamics, so definitely no go.

I'd really be interested to hear what specific tubes others find to work well.

I was very happy with a pair of Marconi 5u4g, but today I see that they have reached very high prices.

 

[Leo246]

For me best option for 6sn7 was Mullard CV181 with pan getter
For 5U4G I use NOS RCA

 

[biscottino]

I don't know if it has been said, but on the Viva you have to use not a normal 6sn7,
but a 6SN7 GTA-GTB upgrade of the basic version with maximum anode voltage of 450 Volt.