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Darkvoice 336i & 336SE Tuberolling PartII - Page 19

post #271 of 1003

I have tried to read everything that I can find about the DV336se and tube rolling. My unit came with a hum in the left channel and has gone silent after about 20 hours, but only with the 6SN7 that came from the factory. The others that I have (Elecro Harmonix, Electro Harmonix gold pin and Tung Sol) still produce a hum in the left channel. Since none of these 3 tubes are NOS I am assuming that this is not a tube problem. I am not equipped (with the skill) to do the fritz mod, so is it safe to assume that the hum will go away eventually ? Should I be running the unit with the humming tubes to get rid of said hum ?

Any advice/help welcome.

post #272 of 1003
Try leaving them in and on for a period of 24 hours. My Raytheon 6SN7s did the same thing and it cleared up after a day in the burner. They weren't totally NOS, just slightly used but it's dead silent since. Worth a shot.
post #273 of 1003

They have now been cooking for 72 hours. There is still a (much smaller) hum and it has gone far left. Think this is the answer. Hope that every tube is not going to need this treatment. Thanks for your input/advice.

post #274 of 1003
Not a prob, great to hear that it's been having some positive effect. beerchug.gif
I haven't had to do this to all my tubes, just some of the "newer" ones. Have fun rolling and be wary of the wallet. wink.gif
post #275 of 1003

MrEleventy, I just found this thread and was wondering if you could give me some advise here. I have a similar issue with DV336se where I have a humming sound in the left channel. I got my amp yesterday and only have those stock tubes that came with it. I guess it needs time to burn in. However, I notice if I switch input and output tubes (large tube in front and small tube behind it) the hum disappears. I'm very new to tube amp world so I don't know if it even safe to keep it that way. Can you advise?

 

Thank you!

post #276 of 1003
Quote:
Originally Posted by cakebreaker View Post

MrEleventy
, I just found this thread and was wondering if you could give me some advise here. I have a similar issue with DV336se where I have a humming sound in the left channel. I got my amp yesterday and only have those stock tubes that came with it. I guess it needs time to burn in. However, I notice if I switch input and output tubes (large tube in front and small tube behind it) the hum disappears. I'm very new to tube amp world so I don't know if it even safe to keep it that way. Can you advise?

Thank you!
I would recommend leaving it on to burn in but in the proper order. The hum is probably "gone" because the 6SN7's gain isn't high enough to make it noticeable. Just give it some time, especially if it's a new unit and new tubes. Also, swap out the stock tubes. Pick up some RCAs (6as7 and 6sn7) from eBay. You can get a set of NOS/Tested well for around $50. Great bang for the buck. GL w/ the hum. smily_headphones1.gif
post #277 of 1003

Okay, thank you for your reply. After 30 hrs it is still buzzing. Perhaps, not as bad as it was. It is hard to say as I was paying too much attention to it ;) Yeap, I ordered some RCAs last night, so hopefully I get my music zen soon. Thank you again!

post #278 of 1003
The hum might go away with just swapping in the "new" tubes so I wouldn't worry too much about burning in and getting the stock tubes just right. They're not worth the time. wink.gif
post #279 of 1003

"might" or may not..I just finished this little mod ,so far I'm happy 

 

post #280 of 1003

i love this amp.... i love this amp. 

ENJOY bros !!

 

( diff combos of tubes will take away humms too, at least it is true on my set :P )


Edited by Lorspeaker - 4/19/14 at 5:09am
post #281 of 1003

Happy to report that after cleaning my tubes (rubber alcohol+tooth brush) and then burning those for another 10 hours my hum is almost disappeared! ;)

I realize that these tubes is not worth of time but I just needed to be sure that there is nothing wrong with the amp.

Appreciate the positiveness from others when I felt like I made a big mistake by buying this amp! I also have Vali and Fiio E09K+E17 combo. I think I won't be using those for a while ;)

post #282 of 1003
Quote:
Originally Posted by spacequeen7 View Post
 

"might" or may not..I just finished this little mod ,so far I'm happy 

 

I never opened up my amp (not yet). Can you elaborate a bit what exactly you did there?

post #283 of 1003
Looks like he replaced some caps.

I have the Vali too, it's less tubey but still very musical. Works well for my 770s, both of them. smily_headphones1.gif
post #284 of 1003

So, similar to Fitz mod or is that it?

post #285 of 1003
Quote:
Originally Posted by cakebreaker View Post
 

So, similar to Fitz mod or is that it?

it's a bypass of two crappy resistors pictured here (thanks doco), "fitz mod"

http://www.head-fi.org/t/353079/dv-336se-hum-fitz-mod/15#post_5248489

 

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