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Old 8th June 2010, 07:04 PM   #11
Thomo is offline Thomo  United Kingdom
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Hi Sid, I use a DIY pre amp which is a tweaked Pedja Rogic discrete class A buffer stage running on DIY discrete low-noise regulators. My power amp is a modified 280wpc monster PA amp by Yamaha which runs class A up to 30W. The speakers are Jamo Concert 8's with improved crossovers and the tweeters are changed to Mundorf AMT (these are still a work in progress).

Ray, do you have any thoughts on the state of my output stage filtering? It seems as though the bass is excessive.

Cheers, Lee.
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Old 8th June 2010, 07:56 PM   #12
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by trehansid View Post
Ray,
Whenever you are free, please let me hear from you in detail on possibly a few (about 3) options on clock w.r.t. price & source please. Also how to go about power supply for the same?

And any mods, that i need to do before the clock's introduction.

Many thanks & appreciate your attention.
Wishes
..
The Tentlabs XO and shuntregulator prices can be found at Tentlabs. The CD-clock and The Flea are DIY clocks, you'll have to build them yourself. There's more info on my website. The price strongly depends on the components you are going to use, so that's hard to say. But a fancy version of The Flea with it's own dedicated power supply and Tentlabs XO is about 65,- in parts.

The clock can be inserted anytime along the modification-ride, but be prepared for some serious SMD surgery (see pictures in my SA8400 section).

Ray
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Old 8th June 2010, 08:03 PM   #13
6h5c is offline 6h5c  Netherlands
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Dunno what causes you bass-problem, Lee. Sounds like that part of the HDAM section has trouble driving the output, maybe the output impedance is too high? This could lead to less control and bloated bass.

Ray
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Old 8th June 2010, 10:33 PM   #14
arupg is offline arupg  Latvia
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I go bang-on with the DOS as suggested earlier by Ray. Marantz & their HDAMs always create unpredictable new snags along the way.

Last edited by arupg; 8th June 2010 at 10:35 PM. Reason: typo
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Old 9th June 2010, 09:23 AM   #15
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Quote:
Originally Posted by 6h5c View Post
The Tentlabs XO and shuntregulator prices can be found at Tentlabs. The CD-clock and The Flea are DIY clocks, you'll have to build them yourself. There's more info on my website. The price strongly depends on the components you are going to use, so that's hard to say. But a fancy version of The Flea with it's own dedicated power supply and Tentlabs XO is about 65,- in parts.

The clock can be inserted anytime along the modification-ride, but be prepared for some serious SMD surgery (see pictures in my SA8400 section).

Ray

That was quick & generous

Thanks for your advice Ray.
Moving ahead with the electrolytics first.

Shall share details and then shall seek your guidance on what to buy next.

Appreciate your gesture to share with all the humility.

my wishes
..
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Old 9th June 2010, 10:58 AM   #16
6h5c is offline 6h5c  Netherlands
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No problem, Sid! And yes, please do share your findings!

Ray
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Old 4th January 2011, 01:21 PM   #17
Thomo is offline Thomo  United Kingdom
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Hello again.

I've been working on my SA7001KI again so I thought I'd post a list of the mods I've done so far.

Thomo's SA7001KI Mods List

Cheers, Lee.
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Old 4th January 2011, 01:24 PM   #18
Thomo is offline Thomo  United Kingdom
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Ray, I hope you still read this thread because my last mod may interest you as it's not something you've done yet I think.

I supplied IC734, 735 with their own low-noise supply. These are the logic chips for the clock frequency selection. It's made a big improvement to all aspects of the sound, particularly in air and space around the top end. I can't recommend it enough.

It's dead easy to do, just remove FB01 and feed in the new supply there.

Cheers, Lee.
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Old 4th January 2011, 02:34 PM   #19
6h5c is offline 6h5c  Netherlands
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Hi Lee,

Yes, i'm still reading it

Nice list, you've been quite busy this month . I thought about removing IC734 and IC735 all together, and feed the clock directly to the DAC. There's just the problem of frequency selection, so it won't be able to play RBCD's after that. So I just left it as it is. But it must be adding jitter to the incoming clock-signal .

There's just one ferrite bead separating the IC's from the rest indeed, not very impressive. I have to open my player anyway, to fit a new analog output stage, and I have a spare Tentlabs shunt here. I'll have a look at it, thanks for the tip!

Ray
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Last edited by 6h5c; 4th January 2011 at 02:36 PM.
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Old 4th January 2011, 03:12 PM   #20
arupg is offline arupg  Latvia
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Hi Lee
Super PSU you've got there. I like the biggie caps from Mundorf/FTCaps - one of the best around! You should be getting a night-to-day change in the 7001. Aren't you?

Arup
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