SissySIT

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#801
Just beautiful.
Serial# 002, very cool.
How much does it weigh?

Is that a Modushop chassis?
I like the lip that goes over the rear plate on the top and bottom covers, should make a stiffer structure.
Those covers are flat on my 500U.
 
#802
Mazeppa said:
Just beautiful.
Serial# 002, very cool.
How much does it weigh?

Is that a Modushop chassis?
I like the lip that goes over the rear plate on the top and bottom covers, should make a stiffer structure.
Those covers are flat on my 500U.
Click to expand...

will tell you tomorrow how much kgs....

yup, as I wrote oomphteenth times - Modushop Swiss Knife case for FW amps format is their 4U/400

enough space , enough heatsinking

you probably have Al top and bottom (and back) , so no lip as with Fe iteration

I don't care mostly is it Fe or Al ....... maybe even more like Fe - better screening of big Donuts , so preamp can be closer if needed
 
#803
Rush said:
ZM,

In your build, I see a full wave bridge rectifier on each secondary winding of the transformer and the common ground is formed between the power supply caps.

I see this is following the F5 schematic by NP.

I also see that the F5 Turbo (also by NP) uses a full wave bridge rectifier across both secondary windings with the transformer's center two leads going to ground between the power supply caps.

I will post both for comparison.

I am wondering what is preferred and why?

I'm building this amp as we speak. Stuffed boards, back panel completed, laying out bottom plate with power supply.

As you can see I have repurposed a 12 channel Sonamp 1250.

Rush
Click to expand...

Rush - post #1 : Babelfish M25, SissySIT - general building tips and tricks

there is a link to specific post about my preferred PSU

read , and then ask , if needed
 
#805
if you have center tapped secondary , with one bridge , any asymmetry between rails loading is resulting in lesser or bigger DC through secondary winding, which is not the case when you have separate secondaries , one graetz bridge per secondary and GND established after bridges

so , with funny Papa's output stage , with SIT up and mosfet down , negative rail is much more (current ) loaded than positive one , so better safe than sorry

there is (somewhere in some of threads linked in mentioned post #1) my analysis of that funny OS behavior , where SIT is practically working against Mosfet , up to the point where mosfet is gone to clipping and only then SIT is practically adding current to load

that's why I joked and named it ∀Class Amplifier
 
#807
Zen Mod said:
if you have center tapped secondary , with one bridge , any asymmetry between rails loading is resulting in lesser or bigger DC through secondary winding, which is not the case when you have separate secondaries , one graetz bridge per secondary and GND established after bridges

so , with funny Papa's output stage , with SIT up and mosfet down , negative rail is much more (current ) loaded than positive one , so better safe than sorry

there is (somewhere in some of threads linked in mentioned post #1) my analysis of that funny OS behavior , where SIT is practically working against Mosfet , up to the point where mosfet is gone to clipping and only then SIT is practically adding current to load

that's why I joked and named it ∀Class Amplifier
Click to expand...
ZN,

Now that you mention it, I do recall reading the explanation.

I didn’t get to correlation though. AND I wanted to repurpose a pair of F5Turbo power supply boards that have one bridge for both windings.

More work, no short cuts for this build.

Rush
 
#816
My Syssy came to me.

Pretty special sort of amplifier. The sound is very wide, very coherent and reveals space in a spectacular way. Layers and layers of sound over each other. It's neither cold or warm sound. It's warm when it needs to be warm - cold when it needs to be cold.



Didn't sound like any SET or SS amp I know, either. This one is Above them.


This amplifier is not designed for one type of music. It pulls out the emotion from everything.
 
#817
High praise, indeed.
Very glad to know you are so pleased.

You encourage me to move my SissySIT project up in the cue.
My THF-51S arrived last week, option 2 kits were already on hand, chassis and PS are proving out with Aleph J boards installed.
May have to retrofit PS to dual mono as ZM is so adamant about the desirability
of same for a really good amplifier.
Seems to be working well for you, eh?
 
#819

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