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Graham Slee's Solo SRG w/ PSU1 - Page 7

post #91 of 113
7/13/09 at 7:14am
hi guys, is gain stage in solo srg op-amp based or is it all discrete topology? if op-amp, what chip is used?
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post #92 of 113
7/13/09 at 4:02pm
It is discrete, without opamps.
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post #93 of 113
7/13/09 at 4:09pm
thanks
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post #94 of 113
7/13/09 at 9:53pm
Thread Starter 
Good question dex85, I know the Novo is a discreet amp. However I have not opened my Solo SRG which is out on loan and will be out on loan for at least another month or so. Once it is back I will open it and look inside, I can tell you the Green Solo I owned in 2007 used the AD823 op-amp.
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post #95 of 113
7/14/09 at 12:05am
Quote:
Originally Posted by mrarroyo View Post
Good question dex85, I know the Novo is a discreet amp. However I have not opened my Solo SRG which is out on loan and will be out on loan for at least another month or so. Once it is back I will open it and look inside, I can tell you the Green Solo I owned in 2007 used the AD823 op-amp.
Look at the photo from Head To Head Headphone Amplifiers: Graham's Slee Solo MC Versus The Aural Audition Review By Phil Gold which looked like discrete to me. I just assumed all the SOLO were discrete:

EDIT - BAH, THAT PHOTO IS THE "AURAL AUDITION", not the Solo. Oops...

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post #96 of 113
7/14/09 at 12:35am
Here is an article Graham Slee Solo Graham Slee Solo Monitor Class headphone amplifier : high-end headphone amplifiers by Graham Slee, GSP Audio - Soundscape HiFi And Music that says:

"The op-amp based voltage amplifier employs advanced low frequency stabilization techniques which deliver a deep detailed bass while maintaining a perfectly flat frequency response. The voltage amplifier supply is effectively isolated from the current amplifier by a 0.1 Farad electronically synthesised capacitor

The discrete current amplifier output stage uses high transition frequency (Ft ) transistors. Even when driving low impedance 30 Ohm headphones the output is capable of a 3MHz full power bandwidth"
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post #97 of 113
7/14/09 at 4:31am
^based on what you wrote, which is better? op-amp based or discrete?

Quote:
Originally Posted by mrarroyo
However I have not opened my Solo SRG which is out on loan and will be out on loan for at least another month or so
i found the pictures of Solo's insides but i'm not sure if its 2007 version or SRG.



EDIT: i now see my first sentence didn't make much sense. i meant what voltage gain stage is considered better? op-amp or discrete?
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post #98 of 113
7/14/09 at 9:13pm
Thread Starter 
Quote:
^based on what you wrote, which is better? op-amp based or discrete?
Sorry but to many variables, it could be or the other. It depends on the designer/builder including the selection of parts made.
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post #99 of 113
7/15/09 at 2:16am
I'd bet a vital body part, that any Solo is not discrete... ok, let me save something.... at least up until the SRG. I say this cause I think the Novo , up until that point, is the only discrete up until then.
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post #100 of 113
8/7/09 at 8:04pm
I have some questions... I still don´t understand the volume control on the Slee Solo... It´s so finicky.

I just got some 300 ohm headphones? Why do I run lower volume on the Slee Solo for those then my 40 ohm Pro 900 for example for the same given volume?
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post #101 of 113
8/7/09 at 9:04pm
Quote:
Originally Posted by oqvist View Post
I have some questions... I still don´t understand the volume control on the Slee Solo... It´s so finicky.

I just got some 300 ohm headphones? Why do I run lower volume on the Slee Solo for those then my 40 ohm Pro 900 for example for the same given volume?
Impedance and sensitivity or efficiency don't always have a constant relationship. Low impedance don't always need a lower volume than high impedance.

As for the Solo, my favorite headphone on the Solo I reviewed was the HD600 (300ohm). The frequency response of the two gave them good synergy, and the Solo had plenty of power for them.
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post #102 of 113
8/7/09 at 10:39pm
Thread Starter 
FYI, Graham has finished the mod on the Solo SRG to extract a bit more bass. Now I am waiting to get my Solo SRG back (out on loan so various members could test) and the parts/instructions from Graham to mod it. Thanks to all who listened to it and recommended a bit deeper bass.
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post #103 of 113
8/8/09 at 5:08am
Is there mod to Novo for more bass?
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post #104 of 113
8/8/09 at 7:16am
I tried it with the HD 650 and the synergy was a lot better then the previous amps. Just had to much mid bass. But well the synergy with the GMPs are obviously even better unless they are just better headphones of course

But well I have yet to find a headphone that sounds bad out of the Slee Solo lol.
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post #105 of 113
8/8/09 at 1:52pm
Thread Starter 
Quote:
Originally Posted by theory_87 View Post
Is there mod to Novo for more bass?
Actually the Novo was revised, if you look at the board pictures of the original Novo it is Rev. 1 while the latest (earlier in 2009) is a Rev. 2. I purchased a kit which is based of the Rev. 2 and although received about 4 months ago I have not built it yet. I was going to then compare the two generations of this amp. I need to build it!

Quote:
Originally Posted by oqvist View Post
I tried it with the HD 650 and the synergy was a lot better then the previous amps. Just had to much mid bass. But well the synergy with the GMPs are obviously even better unless they are just better headphones of course

But well I have yet to find a headphone that sounds bad out of the Slee Solo lol.
How many hours of burn-in do you have in your Solo? IMO they take a long time to settle and should be kept on at all times. In the first 5-8 hours after turning it on the amp does not sound as good as it does after 24 hours of being on.
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