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Old 13th January 2013, 02:52 AM   #1
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Default Adding capacitors to a integrated ampifier

The top picture is a Roksan Caspian M1 (left) and M2 (right) integrated ampifier.
The bottom is a Roksan Caspian M1 preamplifier.

1. Please advise why the capacitors of M1 preampifier (4 large capacitors) are more than the capacitors (2 large capactors) of M1 / M2 integrated ampifier?

2. Are there any benefits of adding 2 large capacitors to the M1 integrated ampifier, which is serving as a preampifier only? (Note: M1 integrated amplifier has a pre-out function to power amplifier)

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Old 13th January 2013, 04:10 AM   #2
gootee is offline gootee  United States
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The one on the bottom does not look like a pre-amp. It looks like a power amp.
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Old 13th January 2013, 04:15 AM   #3
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Quote:
Originally Posted by gootee View Post
The one on the bottom does not look like a pre-amp. It looks like a power amp.

It is a preamp with volume control and input selector.

http://www.roksan.co.uk/roksan/produ...doc/d_16_1.pdf
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Old 13th January 2013, 08:16 AM   #4
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Quote:
Originally Posted by gootee View Post
The one on the bottom does not look like a pre-amp. It looks like a power amp.
Hi Gotee..

Look no speaker binding posts LoL
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Old 13th January 2013, 10:49 AM   #5
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Q1: Why some preamplifiers have "more" capacitors than even good integrated amps, is because one believes in extra good filtration of the power supply.

Q2: No audible benefits will be there to add capacitors on the integrated amp wich is only serving as a preamp. You would need to do quite a bit more with the power supply to have any benefits wich you would enjoy as "better sound".

Explanation 1: As You see, the two answers seems to "kill each other".
But in the bottom preamp, the alterations are probably already implemented, as they are not in the integrated amp.

Why ROKSAN chose to use an "ultra low noise toroidal transformer" in their M2 for the preamplifier section (The smaller toroid there)
But goes for the 350VA transformer in their clean Pre-Amp, I really are not sure why.
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Last edited by TANDBERGEREN; 13th January 2013 at 11:05 AM.
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Old 13th January 2013, 01:27 PM   #6
DF96 is offline DF96  England
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Most people believe that if some of something is good then more of it must be better. This includes some audio designers and most audio journalists. A preamp with big power supply caps is going to get a better review than an identical unit with smaller, but still perfectly adequate, caps - even if it sounds the same (or worse!). Similarly for a big transformer.
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Old 13th January 2013, 05:48 PM   #7
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Interesting, or rather wasteful, that the large size transformer and heatsink are in the preamp too....'wonder what for? Couldn't the budget accommodate an inventory of more but cheaper parts, in line with preamp/phoneamp requirements. Even class A headamps won't need that much power/cooling.

I guess, ANWKLO, that if that lower pic is only a pre/head amp, it is class A and the caps are probably special quality to justify the high price that preamps attract - often the same or little less than the amplifier, even though the basic manufacturing cost could probably be only ~60%.
Also, it's likely that there are 2 PSUs - a dual mono circuit which obviously doubles the power supply parts and the caps, of course.
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Last edited by Ian Finch; 13th January 2013 at 05:56 PM.
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Old 7th June 2013, 05:01 AM   #8
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Referring to the M2 amplifier photo, there is 2 plastic connector that connects the wire of the 2 transformer to the ON/OFF switch.
Any idea what is the brand and model is it.
I am looking for a similar one that can hold 4 wire, the one in the M2 holds 3 wire.

Thank you guys.
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Old 7th June 2013, 06:04 AM   #9
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That preamp power supply could be a shunt regulator...

On seeing the brochure...
It has 10 regulated supplies, so ten dropout voltages and losses and so u need a big transformer

Gajanan Phadte

Last edited by gmphadte; 7th June 2013 at 06:08 AM. Reason: spelling
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