[Wolvebain]

I have an opportunity to get a quad matched set of NOS Tung Sol 5998 tubes, to replace my quad matched NOS 1950's RCA 6AS7G tubes... but they're very pricey for me: $950.USD...
Current pre's on my LD MK6+ are a matched pair of NOS 5691 RCA Red Base tubes.
 
Should I go for it?

 

[Wolvebain]

   
Thanks for the info.
 
Now I am leaning to get the MK8 since I have the HD800S, now can you please suggest a pre amp tube wherein there is a laid back warmish sound with good soundstage for the MK8? I still find the 800S quite bright for my taste. TIA

I wouldn't count the out the LD MK6+ tho... I run my HD800S's on my LD MK6+ and they sound wonderful.
The stock Thomson tubes were a bit bright and lean on the bottom-end..
Until I heeded @ViperGeek's advice and popped in a matched pair of Psvane CV181-T Mark II tubes, and quad matched set of NOS RCA 6AS7G..
 
The LD MK6+ also had more than enough power to spare when when I was running my HE-560's too

 

[rudra]

I have an opportunity to get a quad matched set of NOS Tung Sol 5998 tubes, to replace my quad matched NOS 1950's RCA 6AS7G tubes... but they're very pricey for me: $950.USD...
Current pre's on my LD MK6+ are a matched pair of NOS 5691 RCA Red Base tubes.

Should I go for it?

Ouch, I got my quad matched 5998 at $135 per tube about a month ago.

 

[Wolvebain]

Ouch, I got my quad matched 5998 at $135 per tube about a month ago.

Wow!!!
Care to share from where you source them from? 

 

[rudra]

 
Wow!!!
Care to share from where you source them from? 

On ebay. The seller is pauls994. He also sells in the HeadFi classified sometimes. 
 
P.S. He is also selling Tungsol 7236.

 

[Maxx134]

 

Thanks for the info.

Now I am leaning to get the MK8 since I have the HD800S, now can you please suggest a pre amp tube wherein there is a laid back warmish sound with good soundstage for the MK8? I still find the 800S quite bright for my taste. TIA

I wouldn't count the out the LD MK6+ tho... I run my HD800S's on my LD MK6+ and they sound wonderful.
The stock Thomson tubes were a bit bright and lean on the bottom-end..
Until I heeded @ViperGeek
's advice and popped in a matched pair of Psvane CV181-T Mark II tubes, and quad matched set of NOS RCA 6AS7G..

The LD MK6+ also had more than enough power to spare when when I was running my HE-560's too

Excellent points.
For overall usage , you cannot beat the MK6.
So much tube choice you can basically have it tuned for your preference.

 

[Maxx134]

I still find the 800S quite bright for my taste. TIA

You may have to look into the SD mod for the 800.
A review was at innerfidelity.
Best mod for hd800 so far.

I personally do not use it as I use a fuller sounding one.

 

[Wil]

I was reading through the thread and am of the understanding that one can directly use the 6SN7 tubes in place of the 6SL7 tubes without any modification? (This is for the MKIV). 

 

[rudra]

  I was reading through the thread and am of the understanding that one can directly use the 6SN7 tubes in place of the 6SL7 tubes without any modification? (This is for the MKIV). 

That's correct. You can use the 6SN7 tubes without any modification for the MK VI+
 
The 6SN7 are medium gain whereas 6SL7 is high gain.

 

[Wil]

  That's correct. You can use the 6SN7 tubes without any modification for the MK VI+
 
The 6SN7 are medium gain whereas 6SL7 is high gain.

 
Thanks!

I should have a MKVI coming in soon and i happen to have a pair of Psvane CV181s laying around.
 
Will most probably pair it with an Ether Flow. 

 

[rudra]

I am using 6SN7 tubes on my MK VI+. 
 
did you order your unit from LD directly ? 

 

[Wil]

  I am using 6SN7 tubes on my MK VI+. 
 
did you order your unit from LD directly ? 

 
nope, i have a local dealer that's clearing some stock. 
 
Getting it at quite a good price. 

 

[djj65]

I just received my LD MK VIII SE this week and it is pretty impressive. One curious thing is the amount of time it takes to warm up both the left and right side. I would say it takes 3-4 minutes before both sides are up. Is this normal timing?

 

[john57]

yep

 

[Wolvebain]

  I have an opportunity to get a quad matched set of NOS Tung Sol 5998 tubes, to replace my quad matched NOS 1950's RCA 6AS7G tubes... but they're very pricey for me: $950.USD...
Current pre's on my LD MK6+ are a matched pair of NOS 5691 RCA Red Base tubes.
 
Should I go for it?

 
Sigh...
My quad matched set of NOS Tung Sol 5998 tubes package from WooAudio arrived a few minutes ago.
With customs/import-duties, and the $950USD, I paid about $1000USD.
 
As I was unboxing these tubes, I noticed:

1. There was a slight rattle sound when I moved the tubes... a gentle single shake, and the sound was not slight, but clear and apparent
2. On closer inspection, some of the tubes have small pieces of glass bits freely moving round inside the tube
3. One of the tubes base was loose, and I felt it turn with the least amount of pressure whilst the glass top stays in place

 
 
Tried to call WooAudio twice.. no answer, so left a voice-mail, as well as used to contact form to let them know they can collect these tubes from me and refund me.
 
I mean... If you can't trust WooAudio, whilst paying the super expensive prices they ask for, who/woo can you trust?!?