[timjar]

I think the front panel doesn't look too good in the one photo because of the lighting.

 

[vintageaxeman]

it just looks a bit roughly ground on the edges....
Of course, if you are planning an SE version with an outer case 'like wot I done', then the inner case does not matter too much as long as it shields the amp....so you could get away with a specially designed front panel.....you have any DIY skills or know anyone who can cut/bend sheet metal, etc? The front panel could be made out of 6mm perspex, laser cut, or brass, chrome plated, etc....world's your oyster, really! Especially if you live in an area where there are little traditional machine shops in the backstreets....

 

[Faithless]

Hello guys...

I  bought a Lovely Cube a few months ago.

After many OPAMPs changes...
I found a HUGE improvement using the AUDIO-GD OPA-Earth.
It need a extension cord for fitting it inside the case (Cap Type - about 150-200mm).
http://www.audio-gd.com/Pro/diy/OPA/OPAEN.htm
 
There was an noticeable improvement in the sound extension.
More defined bass and treble.
More natural and spatial sounds.
Just great !!!

I will take some pictures soon...

 

[jimbomak]

 
My first attempt at building a clone. Sounds good and hardly use my Graham Slee Novo now. Top picture is the bare board. Board £25. Chassis £40. Transformer £20. Alps pot £10. 

 

[jimbomak]

My Clone and Graham Slee Novo. Might have to tweak it a little bit. Already replaced clone volume control with an Alps and input capacitors with [size=small]2.2uF 400V MKP Polypropylene film capacitors[/size] . Also replaced op amp that came with it for an [size=small]OPA2604AP. Myself and my friend prefer the clone to the Novo. Use Audio Technica ATH AD700 and Grado SR325 headphones on these.[/size]

 

[algar_emi]

Ictmanganer you have mail. I want to discuss parts choice.Thanks...
Algar_emi
 

 

[staxPatrick]

I completely removed the power supply from my headphone amplifier. I built a Lt1083 regulated +-15v power supply  to power the amp. here are pictures. I haven't hooked it up as yet. The transformer is 80VA, dual 18V secondaries. Filter caps., 10,000uF, dual bridge discrete diodes. I will post updates when I get time to do some more work on the unit.
. 
 

 

 

 
I've finally finished the power supply and amplifier.  The new power supply took the amplifier to a different lever of performance. I removed all the power supply parts from the original design. I don't really like the sound of LM3xx regulators, too harsh and noisy.

 

 


Don't expect miracles by just replacing passive components. The heart of every audio system is the power supply, so that's why I spent so much time building the best sounding power supply for the amp. The improvements especially in the bass areas are nothing short of subwoofer quality deep and controlled. Music comes out of a dark silent background with authority and fullness. The power supply is fully adjustable and is very stable and runs very cool.
 
Additional changes that I made to the amp are input caps are polypropylene in oil, power rail caps are Panasonic FM 680uF and 470uF bypassed with .1uf, silver mica caps input to ground on op amp. I will roll op amps to hear what suits me best. I also replaced the phone sockets with Neutrik gold plated. My objective is to  address areas that make the most significant difference in sound.
 
I'll probably sell this amp and move on to the next project. If you have questions, just email me.
 

Reply

 

[sunneebear]

That is one serious first post.  Very nice work.

 

[Danielsc]

Hello to all..
This is my ever first post on a forum..
But it is now more than one year I red every post of this thread.
I managed to build a "personnal" clone of the Lehmann..
I used all excellent components.. PRP résistors, Siemens styroflex, Mundorf caps, Panasonics, .. LME49720HA opa..
I Think I reached a top of quality.. It sounds very, very good with my Sennheisers HD 600..
 
I tried to post a picture.. but system says there is a communication problem with the server..
I 'll try later..

 

[Carlitos]

can you convert the lovely cube to "dual mono"?

 

[liamstrain]

Quote:

can you convert the lovely cube to "dual mono"?

Convert? Not that I know of - You could do full balanced by building two of them in one casing. 

 

[Carlitos]

ok thankss!  so no "lovely matrix quattro cube" for me   

 

[MrTechAgent]

Its Engineering after all

 

[Danielsc]

Hello..
Can you maybe tell me how to post pictures while replying?
I get no form when I click on the "insert image" icon..
Can it be because I've IE10?
 
Regards.
Daniel

 

[MrTechAgent]

Quote:

Hello..
Can you maybe tell me how to post pictures while replying?
I get no form when I click on the "insert image" icon..
Can it be because I've IE10?
 
Regards.
Daniel

It is because of your post count , once you go over 30-40 you will be able to post pics