[Aynjell]

Quote:

I dont let it cool down between headphones.
 
I turn it on... wait 10-15 seconds for the tubes to warm up and begin listening. The only thing I pay attention to: making sure I only leave it running for 8hrs or less continuously as is recommended by David on the Little Dot site.

Same here for me.

 

[WayTooCrazy]

Excellent... I'll do the same then... I'll just drop the volume knob to nil before swapping headphones.

 

[drewfus420]

I just ordered some of these TELEFUNKEN 6AK5 CV4010 5654 TUBES, anyone out there have any experience with them?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250632195726&ssPageName=STRK:MEWAX:IT
I am running Mullard CV4010's in both my LD 1+ and MK II right now and wanted to try something new.

 

[Aynjell]

Quote:

Excellent... I'll do the same then... I'll just drop the volume knob to nil before swapping headphones.

No, but make sure the amp is off if nothing is plugged in. There are only two things I'd do with this amp that I'd be sure to follow:
 
Turn the amp off ever 8 hours or so to give it a break. Smokers, on your smoke breaks is a great time.
Secondly, do not leave the amp on when you switch cans.
 

 

[WayTooCrazy]

Well, I was an idiot and burned out my first set of Western Electric 408A tubes.  I got too excited and popped them into the LD I+ before changing the jumpers.  I burned them in for 28hrs and then noticed that one channel was louder than the other.  Then I swapped them (it followed the 1 tube).  So... I turned everything off... did some research (RTFM.... and noticed I was supposed to move 2 jumpers).  I did that... now both channels work.. but I have to turn the volume knob ALL THE WAY UP to hear anything.  I currently have the stock 6J1 tubes in now (and they sound pretty good with the LT1364).  Is it worth it to re-order the WE 408A?  I would like to drive a K702 (looking at getting one in a few weeks).  ..and I read that the LD I+ with LT1364 and 408A tubes were the ticket.

 

[WayTooCrazy]

Ok.  I still haven't purchased my OWN K702.  ...but I borrowed a friends.  I'm using them with a custom OCC Cable (I believe it's a DHC).  The cans sound good, but not as mind blowing as I thought.  I then listened to the same tracks with my OFC re-cables Grado SR-80i (with cups damped internally with felt).  The Grado sounds fantastic.  Much more exciting than the K702.  I have the LT1364 and Western Electric 408A.  Should I be looking at different tubes and OpAmp to make the K702 sound even more exciting than my Grados?  If this is what I can expect, I don't want to spend $250 for K702 and another $150 on a cable to have it sound close to my $100 SR-80i with about $30 in re-cable (it's DIY).  Any suggestions would be appreciated.

 

[morfic]

Have you tried a LME49720 in your amp? (Good opamp for any phone)
 
Have you tried some black plate 6AK5W? (Should all have a low end better suited for K702)
 
IF the K702 were known for their low end, i'd suggest the LME49720+EF91 combo that's rockin my HFI-780 (EF91 have amazing voices and detail, but on cans that have a weaker low end, you may not appreciate them)
 
 

 

[WayTooCrazy]

I didn't think the low end on the K702 was bad at all.  It actually surprised me from all the reports of them being really weak.  I wonder if anyone else has tried this combo.

 

[Aynjell]

I've basically fallen in love with my current setup. I want a bit closer mids, and a bit stronger bass.
 
Currently using LT1364 op.amp. and M8083 small shields...
 
Seems like mids are thin and bass is a bit weak, but I get that feeling of space and power that I want. I think I may be best off changing tubes. I'm going to roll through the rest of mine tonite, but I know I'm totally over the M8161. They're so undetailed, sqaushed together and unfeeling... just plain boring and will take a perfectly good pair of cans and make 'em sound like mud.
 
This setup gives me the power, and the fidelity, now I just need a bit of fine tuning audio wise... maybe a bit more bass and some closer mids. Ideas? What can I change to get there?

 

[Aynjell]

Because of all the chatter, and due to availability on any major parts dealer sites, I just ordered a pair of OPA2107's off of ebay for 9.99. Two, for less than the price of 1. And since nothing else but maybe an LM4562 would have gone into my order, and even were I to order them still it'd be chaeper to order the opa2107's on ebay because they're just that much cheaper. Free shipping to boot.

 

[cristox]

hope they are not faked...

 

[morfic]

Digikey is the best source for me.
And since i got the two OPA2107 "for free" with my I+, i know i would never buy them.
LME49720 (aka LM4562) + shipping < 9.99 but in enjoyment the LME are > * 
Just good we don't all have the same taste and not one combination will manage to make everyone happy.
If you think the OPA2107 might be fakes, i can send you one of mine, while i do not know their birthplace, it could get you a reference, they are not horrible, just not what i like.
 
 
 

 

[WayTooCrazy]

Well, My K702 are on their way.  I'm still unsure what I should use on the LD I+.  I know the W.E. 408A with LT1364 is not a great setup for it.  Though it works great with my Grados.  I see myself using the Grados more, so I just might pick up a Bravo V2 amp and roll in a different tube for the K702.

 

[Aynjell]

Quote:

hope they are not faked...

I didn't even think of that last night. I'd obviously hope somebody isn't faking a burr brown OPA2107. That'd just be silly.

 

[reiserFS]

Does anyone know where I could source a pair of Sylvania 408s Gold from? Didn't have any luck on eBay so far.