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Little Dot I+ Tube Rolling
Mar 1, 2014 at 2:48 PM Post #1,816 of 3,154
gibosi said:
   
As you face the amp, left is left and right is right. If you swap tubes, does the scratchiness move to the right ear? Does this happen with other tubes, as well? 
Click to expand...

I only notice it with the Mullard's. Once I past 30 minutes the scratchiness starts to get louder and louder. I even have 3 sets of 8083's. Same thing. The left tube or pot makes these sounds.Maybe it is that family and the voltage being a problem.
 
Mar 1, 2014 at 3:07 PM Post #1,817 of 3,154
henree said:
  I only notice it with the Mullard's. Once I past 30 minutes the scratchiness starts to get louder and louder. I even have 3 sets of 8083's. Same thing. The left tube or pot makes these sounds.Maybe it is that family and the voltage being a problem.
Click to expand...

 
This is a new one on me. The only time I hear a "scratchy" sound is when the cathode (pin 2) has a poor connection. But if so, you should hear this on all your tubes. 
 
The 8083 is an EF91 tube.... The only thing I can think of is that perhaps the left EF91/92 jumper is a bit loose. But that is a long shot as that jumper ties pins 5, 6 and 7 together..... Otherwise, I don't have no idea.... sorry....
 
Mar 1, 2014 at 3:15 PM Post #1,818 of 3,154
gibosi said:
   
This is a new one on me. The only time I hear a "scratchy" sound is when the cathode (pin 2) has a poor connection. But if so, you should hear this on all your tubes. 
 
The 8083 is an EF91 tube.... The only thing I can think of is that perhaps the left EF91/92 jumper is a bit loose. But that is a long shot as that jumper ties pins 5, 6 and 7 together..... Otherwise, I don't have no idea.... sorry....
Click to expand...

Thanks,
 
I think I will purchase another brand in the ef91 family. To see if I notice the same thing. Doubt it though. I did however get the 4562 back working by applying an adaptor. It is very harsh in the treble region. But good vocal detail and decent bass.
I really want to try that MUSE you mentioned. But the price is so high. Maybe when I get my income taxes done. LOL
 
Mar 1, 2014 at 3:19 PM Post #1,819 of 3,154
henree said:
  I think I will purchase another brand in the ef91 family. To see if I notice the same thing. Doubt it though.done.
Click to expand...

 
Before I got double triode fever, this was the best EF91 I heard:
 
http://www.ebay.com/itm/EF91-CV4014-KB-Z-GEC-NOS-MATCHED-PAIR-/310114507805?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item483443dc1d
 
But that money, you could get a MUSES 02. lol :)
 
Mar 5, 2014 at 7:55 PM Post #1,820 of 3,154


The Voshkods are in! Immediately better than the basic EF92 tubes. Gonna listen for a while, then play with opamps.
 
Mar 10, 2014 at 4:10 PM Post #1,822 of 3,154
henree said:
  I only notice it with the Mullard's. Once I past 30 minutes the scratchiness starts to get louder and louder. I even have 3 sets of 8083's. Same thing. The left tube or pot makes these sounds.Maybe it is that family and the voltage being a problem.
Click to expand...

Just to update you guys. I have yet to find a solution to the left ear static problem with my amp. It wasn't the tubes something in the circuit has gone bad. So I am giving up on this amp. Too bad because the 8083 tubes coupled with the 4562 op-amp was heaven to me. David hasn't responded to my emails either. Time to move on.
 
Mar 11, 2014 at 2:35 AM Post #1,823 of 3,154
henree said:
  Just to update you guys. I have yet to find a solution to the left ear static problem with my amp. It wasn't the tubes something in the circuit has gone bad. So I am giving up on this amp. Too bad because the 8083 tubes coupled with the 4562 op-amp was heaven to me. David hasn't responded to my emails either. Time to move on.
Click to expand...


Funny you should say that about David as there is a new post in (I think) the headphone forum praising their great customer service. I have noticed that about LD in reading various posts, some people seem to get exceptional service and others basically no service at all.
 
Mar 16, 2014 at 11:22 AM Post #1,826 of 3,154
Just a few impressions for some Novosibirsk 6J3P-Es I've been giving head time:
 
Treble: Very smooth. Not aggressive but still lots of quality.
Mids: Liquid. Nice and thick but still very clean.
Bass: Full and round. Good texture. Not super deep but still extends well.
 
Soundstage: Better than Voskhod
Separation: Excellent. Everything is easily pinpointed.
 
These tubes have given the Voskhods a run for their money. My pair at least, is quieter than the Voskhod. The Novos aren't as aggressive as the Vosks, but they are extremely quiet and still have plenty in common with their Russian cousin.
 
For anyone looking to try em, I highly recommend.
 
PS. For anyone looking to try some Tung Sols or Mullard 8083s, I'm putting mine up FS soon. If you PM me referencing this post, I'll cut you a deal!
 
Mar 22, 2014 at 7:52 PM Post #1,829 of 3,154
Hello everyone. I'm sorry to disrupt the flow but I have a mission and I've been sent in this direction.

I'm currently using a Fiio E18 to drive my AKG Q701's. While I have no problems getting things loud there's an inherent edginess to the sound of the AKG's treble & upper mids regions.

I'd like to dial this out but I don't want to use EQ to do it. I've always fancied using valve gear and the idea of tube rolling excites me. I'm not rich so I'm thinking this is possibly the place for me.

What do you guys think? If you suggest I go for it I'll get right back to the start of this thread and begin the work.

Thanks for listening.
 
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