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Babelfish M25, SissySIT - general building tips and tricks
Babelfish M25, SissySIT - general building tips and tricks
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Old 7th November 2018, 09:08 PM   #111
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Babelfish M25, SissySIT - general building tips and tricks
see

we both Know Station

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Old 7th November 2018, 09:10 PM   #112
noelectrix is offline noelectrix  Europe
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know station is my home : )
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Old 11th November 2018, 07:02 PM   #113
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Babelfish M25, SissySIT - general building tips and tricks
Default PSU

my habit - custom made Donut - always asking for decreased flux in core , which means more turns per volt than usual jobbie

300VA , separate 18Vac secondaries , one per channel

static shield , magnetic screen

filter - CRC , made of 33mF-0R1/WW/5W-33mF , per rail

yup, one Graetz bridge per secondary , so two per PSU

meaning that - when case is common , you'll have just IEC and switch shared between channels , after that NTC (CL-60 or equivalent) in series with primary and one fuse per primary

then 10-15R NTC from audio GND to chassis , safety GND of chassis is mandatory

as illustration - Papa's drawing from F6 article

EDIT: Member requested an edit to 'is mandatory'
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Last edited by Cal Weldon; 11th November 2018 at 10:45 PM. Reason: changed for not to is mandatory
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Old 11th November 2018, 07:18 PM   #114
noelectrix is offline noelectrix  Europe
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without center tab (250V), we use 2 Cl-60 (in each primary instead one CT)?
tnx,
st
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Old 11th November 2018, 09:18 PM   #115
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Babelfish M25, SissySIT - general building tips and tricks
it's always one NTC per one primary winding



btw. I pretty much wrote everything I planned in post #1

let me know - do I need something to add there
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Old 11th November 2018, 09:42 PM   #116
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Babelfish M25, SissySIT - general building tips and tricks
btw. did you got your Sissy to bigger speaks/ better source ?
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Old 11th November 2018, 10:06 PM   #117
sontero is online now sontero  Italy
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dear ZM with the last update to post # 1 you finally answered my incessant question "Bias procedures .... bias procedures ... BP .... beep" . now you have finally turned off the alarm that had been lit for quite some time.
Now the picture is complete .....
really .... thanks for your great work


PS=another little question .......
why not use a "soft start" instead of NTC?

Last edited by sontero; 11th November 2018 at 10:14 PM.
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Old 11th November 2018, 10:19 PM   #118
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Babelfish M25, SissySIT - general building tips and tricks
of course you can use soft start instead of NTC ;

but - as I'm always saying - to get really soft soft start - replace all fixed series** resistors with NTCs .... no more than 30R in sum value

**some are making soft start with paralleled resistors , which is recipe for .... not exactly disaster , but certainly non-functional soft start

edit: your avatar - Giger ?
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Old 11th November 2018, 10:33 PM   #119
sontero is online now sontero  Italy
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excellent hint ZM

yes, the great Giger ..... one of my most beloved artists ... after Jimi Hendrix ... but there are also many others
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Old 11th November 2018, 10:35 PM   #120
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Babelfish M25, SissySIT - general building tips and tricks
hope you did watched documentary about Jodorowsky's Dunes ......
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