[theryaner]

I just installed the OPA2107 today, and wow! HUGE difference compared to the 1364. This will definitely keep the skeptics on whether op-amps changes anything quiet. I literally just installed it about 10 mins ago so I won't write a huge report. But from what I can tell it's a lot smoother and less analytical than the 1364, good match with my grado 325is's. Music feels more organic and less "electronic" than the 1364, possibly more refined. To sum it it up, it basically has a similar effect to installing mullard tubes and will slightly sennheiser your grados.

@markkr

If you want more bass, I recommend these:

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT

These has a much more powerful presentation than my m8100's. I cannot comment on the tubes you're using but these might be what you're looking for.

 

[markkr]

Quote:

Originally Posted by theryaner /img/forum/go_quote.gif @markkr If you want more bass, I recommend these: M8083/CV4014/EF91 MULLARD NOS MATCHED PAIR - eBay (item 310087990802 end time May-22-10 03:11:15 PDT) These has a much more powerful presentation than my m8100's. I cannot comment on the tubes you're using but these might be what you're looking for.

It just so happens... that I have a pair of these that I haven't tried yet. I bought them from a fellow head-fi'er about a month ago and just haven't gotten around to them yet.

 

[markkr]

What family is the 4014 in? (so I set the jumpers correctly)

some posts look like they're EF91's others say EF95...

Also, I received a SECOND set of 408a tubes (TungSol) from a completely different source and one of them doesnt work... is this a common problem? The pins are clean, it just produces no sound???

 

[theryaner]

Quote:

Originally Posted by markkr /img/forum/go_quote.gif What family is the 4014 in? (so I set the jumpers correctly) some posts look like they're EF91's others say EF95... Also, I received a SECOND set of 408a tubes (TungSol) from a completely different source and one of them doesnt work... is this a common problem? The pins are clean, it just produces no sound???

I'm pretty sure they are EF91's.

 

[markkr]

Quote:

Originally Posted by theryaner /img/forum/go_quote.gif I'm pretty sure they are EF91's.

Do 91's and 95's use the same jumper settings? The manual online doesn't list a setting for the 95's. (This amp too far too long to receive to blow it up so soon)

 

[Trapper32]

Quote:

Originally Posted by markkr /img/forum/go_quote.gif Do 91's and 95's use the same jumper settings? The manual online doesn't list a setting for the 95's. (This amp too far too long to receive to blow it up so soon)

the 91 shares the same setting as the 92

the 95 is the equivalent of the 6ak5 and uses a different setting than the 91/92

and of course the 408a is completely different setting again


and theryaner is correct that the 4014 is equivalent to the 91

 

[markkr]

Quote:

Originally Posted by Trapper32 /img/forum/go_quote.gif the 91 shares the same setting as the 92 the 95 is the equivalent of the 6ak5 and uses a different setting than the 91/92 and of course the 408a is completely different setting again and theryaner is correct that the 4014 is equivalent to the 91

Great, thanks guys!

 

[Aynjell]

Quote:

Originally Posted by markkr /img/forum/go_quote.gif Great, thanks guys!

Yep, which means 408a/6ji jumper needs to be on 6ji setting, and ef92 jumper needs to be on.

 

[theryaner]

ahhhh!!! unfortunately my brand new 4014's have been glitching out and I really don't know why. It was working fine for about 2 days and it started developing a static hiss,and the left channel would light up really bright on start up. Oh well, I think I like my 8100's more anyways.

 

[markkr]

I'm hearing random static on both channels... no matter which tubes. I think its the 49720 opamp doing it... My 2107 should be here this week

I'm TRYING to talk the Wife into letting me order a second LD I+ to keep at home. The other one lives at my desk at work. So far: NO GO

 

[Aynjell]

Quote:

Originally Posted by markkr /img/forum/go_quote.gif I'm hearing random static on both channels... no matter which tubes. I think its the 49720 opamp doing it... My 2107 should be here this week I'm TRYING to talk the Wife into letting me order a second LD I+ to keep at home. The other one lives at my desk at work. So far: NO GO

That's why you order up something different instead without asking. It's better to ask for forgiveness than permission, you know it?

 

[markkr]

Quote:

Originally Posted by Aynjell /img/forum/go_quote.gif That's why you order up something different instead without asking. It's better to ask for forgiveness than permission, you know it?

That's what I normally do, however I didn't exactly ask for permission for the first LD I+... doing it twice within a month might be pushing my luck.

 

[markkr]

What family are the 4010's in? (jumpers settings question again)

I'll be comparing my new 4010 and 4014 tubes tomorrow. (I've gotten very use to the 408a's)

Thanks

 

[markkr]

do the CV4010 and CV4014 use the SAME jumper settings???

 

[john57]

Quote:

Originally Posted by markkr /img/forum/go_quote.gif do the CV4010 and CV4014 use the SAME jumper settings???

Nope, the two tubes CV4010 and CV4014 and NOT in the same tube family.

The CV4010 is in the 6JI family and the CV4014 is in the EF91 group.

Also after using the 408A tubes to others types, you must move the 408A jumpers (there is two) back to 6JI otherwise damage is going to happen because you can not have 20v heater voltage on a 6v tube and the Little Dot itself can also be damaged. Be sure you have correct information before you change jumpers or tubes.

To use WE408A tubes:
1. K1 and K2 set to the side of the “WE408A” text
2. Make sure the jumper caps are removed from J1 and J2 (open circuit)
To use 6JI, 6AK5, 5654, WE403A/B, etc:
1. K1 and K2 set to the side of the “6JI” text
2. Make sure the jumper caps are removed from J1 and J2 (open circuit)
To use EF91, EF92, CV131, CV138, etc:
1. K1 and K2 set to the side of the “6JI” text
2. Make sure the jumpers caps are in place over both J1 and J2 (short circuit)

This is from Littledot.net web site.