[signet02]

   
You are most welcome signet02.
 
Yes, you are correct.  J1 and J2 open for EF95 tube family (20v heaters).   K1 and K2 jumpers connectting the L/H two pins, marked '408A' on the board.  J3 & 4 open (3x gain) or closed (7x gain) depending on whether you need high or low gain (high or low impedance headphones).
 

 
Thanks... Just to clarify: My LD1+ manual says J3/J4 [closed] is for 3.5 gain, and J3/J4 [open] is for 7.0 gain...  ?...

 

[signet02]

Two questions:
 
1) Is this legit?:  http://www.ebay.com/itm/161085567268?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
 
2) Is this Muse 01 op amp compatible with the LD 1+?...
 
There seems to be different numbers on some of them... ???...

 

[kvtaco17]

  Two questions:
 
1) Is this legit?:  http://www.ebay.com/itm/161085567268?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
 
2) Is this Muse 01 op amp compatible with the LD 1+?...
 
There seems to be different numbers on some of them... ???...

1) I dunno, but most likely it is...
 
2) it is very compatible and sounds very good.

 

[signet02]

Thanks... I'm always wary of knock-offs... Esp. from Chinese sources...  They go upwards of $90 from other sources...

 

[kvtaco17]

  Thanks... I'm always wary of knock-offs... Esp. from Chinese sources...  They go upwards of $90 from other sources...

Me too, BUT based on his feedback it should be safe

 

[gibosi]

  Two questions:
 
1) Is this legit?:  http://www.ebay.com/itm/161085567268?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
 
2) Is this Muse 01 op amp compatible with the LD 1+?...
 
There seems to be different numbers on some of them... ???...

 
I have no experience with that vendor. However, I and a number of others have purchased both the MUSES01 and MUSES02 from this vendor:
 
http://www.ebay.com/itm/400418604577?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
 
And yes, the 01 is compatible with the LD1+ per a private email from David. Further, I have used both the 01 and 02 in my LD1+. Both are excellent and it really comes down to preference: The 02 is wetter and more tube-like. The 01 is drier and more neutral.

 

[kvtaco17]

^ the man, the legend has spoken!

 

[signet02]

   
I have no experience with that vendor. However, I and a number of others have purchased both the MUSES01 and MUSES02 from this vendor:
 
http://www.ebay.com/itm/400418604577?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
 
And yes, the 01 is compatible with the LD1+ per a private email from David. Further, I have used both the 01 and 02 in my LD1+. Both are excellent and it really comes down to preference: The 02 is wetter and more tube-like. The 01 is drier and more neutral.

 
I have that vendor/item up on my watched list...  Thanks...

 

[MunkyOne]

   
Thanks... Just to clarify: My LD1+ manual says J3/J4 [closed] is for 3.5 gain, and J3/J4 [open] is for 7.0 gain...  ?...

Just checked mine, it says the closed position is low gain.  Is yours a V3.0 board?  I suppose it is possible that the manuals are not entirely in order, being half Chinese and half English.   Just physically checked it, closed, then open, through my 32-ohm Grados it does seem louder in the open position. 

 

[signet02]

  Just checked mine, it says the closed position is low gain.  Is yours a V3.0 board?  I suppose it is possible that the manuals are not entirely in order, being half Chinese and half English.   Just physically checked it, closed, then open, through my 32-ohm Grados it does seem louder in the open position. 

 
Right... J3/J4 [closed] is 3.5 gain, which is low gain for low impedance headphones like mine [32 ohms]... The less impedance, the less gain you need to reach full volume, right?...
 
J3/J4 [open] is high gain [7.0] for higher impedance headphones which need more gain to reach useable volume, right?...
 
I hope I got that right... 
 
I'm thinking of pulling the trigger on a muses 02... 

 

[MunkyOne]

   
Right... J3/J4 [closed] is 3.5 gain, which is low gain for low impedance headphones like mine [32 ohms]... The less impedance, the less gain you need to reach full volume, right?...
 
J3/J4 [open] is high gain [7.0] for higher impedance headphones which need more gain to reach useable volume, right?...
 
I hope I got that right... 
 
I'm thinking of pulling the trigger on a muses 02... 

Correct.  Low impedance headphones present an easy load, so the amplifier doesn't need so much power to drive them properly.
 
Thinking about trying the muses op-amps myself.  Looking through the threads here, to decide if I need the 01 or 02. 

 

[signet02]

I guess I'd better fess up an show where I have my LD 1+ right now...
 
It's doing service as a headphone amp for my Yamaha CP 300 digital piano... And admirably, I might add...
 
[see:]
 
http://i203.photobucket.com/albums/aa208/signet02/001_zpsbd38e79d.jpg
 
 
http://i203.photobucket.com/albums/aa208/signet02/002_zps94610ca0.jpg
 
 
The CP 300 unbalanced line outs (L+R) are pretty hot... So, the low gain setting works well... It puts both the keyboard volume, and the headphone amp volume at about 12 O'clock... Pretty much the sweet spot for pots of that type...
 
The CP 300 is a studio grade instrument with stereo Hi Fi output... Dead quiet...
 
Note: The CP 300 also has fully balanced stereo outputs...

 

[signet02]

Gibosi: Just pulled the trigger on a muses02 from your recommended eBay vendor... I think I prefer a more liquid tube-like presentation...  I may purchase another LD 1+... One for my audio system, and one for the aforementioned purpose [digital keyboard]...
 
So, ultimately, at least for now, it will be the Muses02 / WE 408A combination...
 
I am, however, planning to buy a pair of Sennheiser HD 600 headphones next month... These are listed as 300 ohm, and I'm expecting that I will have to use the high gain setting for these... I'm going with the HD 600s because they are listed as a professional headphone that will do double duty for both my digital keyboard and audio system, as my budget is somewhat constrained...
 
A pro headphone will take a heavier hit, SPL-wise, and also handle the kind of waveforms an electronic instrument can put out, like some of the synth voices, which can almost be a square wave... Also, the HD 600s are fully modular, and the user can replace almost all the parts...
 
I would like to thank you all for your good info... It has helped immensely...

 

[i luvmusic 2]

I did some test running LD 1 without the bottom plate and on some tubes it pickup noise/hum anyway i'am about to cut it open now.

 

[gibosi]

  So, ultimately, at least for now, it will be the Muses02 / WE 408A combination...
 
I am, however, planning to buy a pair of Sennheiser HD 600 headphones next month...

 
When you get your new opamp and headphones, I hope you will come back here and give us your impressions.