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Old 5th October 2013, 11:23 PM   #2561
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Join Date: Jun 2011
Quote:
Originally Posted by Lazy Cat View Post
Hi Odysseas

Last 30 VSSA PCB sets are waiting to be send out as soon as I'll get assembled PCB's from manufacturer.

I aligned numbers of received ALF mosfets and PCB's since there were inquiries up to the last piece. Cannot help for the time schedule since it doesn't depends just from me.

Remaining 7 GB members to receive VSSA as soon as possible:

milandks 4 PCB set
audionootje 4 PCB set
ua3grn 6 PCB set
Odysseas 4 PCB set
edbk 4 PCB set
woofertester 4 PCB set
Metallicus69 4 PCB set


Regards L.C.
Thank you for the update LC. I am looking forward to using your VSSA boards.
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Old 9th October 2013, 12:19 AM   #2562
bimo is offline bimo  Indonesia
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I try to change compensation in simulation. It give better distortion in 20kHz and wider bandwidth.
I ask all masters here, if this compensation will give VSSA stable?
I will try this compensation in my VSSA later.
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Old 9th October 2013, 04:49 AM   #2563
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Originally Posted by meanman1964 View Post
Lazy Cat please remove some mails mine doesn't get trough
Maybe you can send me a mail

Can you tell me the dimensions of the case you've used for the VSSA and if they are still for sale.Maybe I need ten of them all depends on the price.
Regards
Patrick
LazyCat,where are you?????
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Old 9th October 2013, 09:55 PM   #2564
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Quote:
Originally Posted by meanman1964 View Post
LazyCat,where are you?????
Assembling three First One-s for the exhibition, haven't sleep for a few days. :P
I'll be back
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Old 9th October 2013, 09:58 PM   #2565
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Quote:
Originally Posted by bimo View Post
I try to change compensation in simulation. It give better distortion in 20kHz and wider bandwidth.
I ask all masters here, if this compensation will give VSSA stable?
I will try this compensation in my VSSA later.
In sim only, in reality 15 MHz oscillator
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Old 9th October 2013, 10:41 PM   #2566
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Quote:
Originally Posted by Lazy Cat View Post
In sim only, in reality 15 MHz oscillator
Don't believe in Reality :-)
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Old 9th October 2013, 11:00 PM   #2567
BYRTT is online now BYRTT  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
Assembling three First One-s for the exhibition, haven't sleep for a few days. :P
I'll be back
Hey then good fight with solderiron....
Nice exhibition and audio talk/gossip...........
And good night when bedtimes come..................... ...
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Old 10th October 2013, 01:11 PM   #2568
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by Lazy Cat View Post
In sim only, in reality 15 MHz oscillator
How much practically maximum ULGF in VSSA if we try another compensation?

Last edited by bimo; 10th October 2013 at 01:15 PM. Reason: Typo
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Old 10th October 2013, 04:39 PM   #2569
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Have two questions:

1. Converting input to 2sk246/2sj103 in order to raise input impedance. Any obvious issues?

2. Gain variations - just need about +-1db, but what are the safe limits to vary gain?

Thanks.
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Old 10th October 2013, 05:30 PM   #2570
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To bimo and analog_sa, the only way to get an answer to your question is to... try by yourself. :-)

Maximum ULGF is only the one you can get stable with your real build, ...experimenting.

Fets input VS BJT ? The one you prefer (on your listening experiences). While you can prefer a single path feedback network with fets ? An other amp. Fets are better for EMI/RFI, while a little more 'grainy' ?
May-be they will be at their best with different gain ?
High input impedance ? What the need, as we prefer it as low as possible, preamp side ?

Gain variations ? Same response than ULGF. More open loop gain, more feedback, less distortion, less stability... Listen and chose your best compromise, the only way...

Or take for granted that L.C. had spend a lot of time to do all those experiments, and save time using his amp as-it :-)
That i will do, on my side, with may-be a little try to increase PSRR, with a VAS/Input rails external regulation and tune the low pass filter FC in my real hifi system configuration.
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Last edited by Esperado; 10th October 2013 at 05:38 PM.
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