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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 5th November 2018, 12:51 PM   #61
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25, SissySIT - general building tips and tricks
no need to re-check bias

normal behavior
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Last edited by Zen Mod; 5th November 2018 at 12:56 PM.
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Old 5th November 2018, 07:22 PM   #62
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Babelfish M25, SissySIT - general building tips and tricks
Default some input xformer trickery

as already mentioned - with Cinemags there is some trickery necessary , to put them on pcbs

pins 1 and 2 are closer than other ones , so you know which pin 1 is - red dot on pictures

cut pins 1 , 6 , 7 and 12 , then you can mount Cinemags on pcb ; as you can see , on both channels pin 1 is near pcb edge

also pics of Edcors , Cheapskate Champions (one of cases where article is cheaper than shipping) - they're oriented with 180deg difference between channels ; pinout orientation pretty clear and straightforward , so no biggie there
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Old 5th November 2018, 08:49 PM   #63
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Problem with right channel:
This time setting Iq for buffer was almost straight forward. I just didnt get offset to zero and had to increase Iq to 22mA. Trick could be to increase upper R27 to have more headroom?
Then inserted JP, but turning on Iq pot did increased (U over R0.1) from around 4mV to just 5.6 mV to the end of pot, offset increased to almost 15 Volts.
Got me a bottle of wine to the studio to celebrate stereo this night, but this must wait (stereo, not wine).
Will of course recheck da hole thing tomorrow. Its really not that i watch series while stuffing PCBs, but this time im troublemaker.

Its late ZM, im happy for your thoughts in time : )
best
st
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Old 5th November 2018, 09:06 PM   #64
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Babelfish M25, SissySIT - general building tips and tricks
well , troublemaker or not , I'm sure you'll find what's the culprit

it could help if you post some pictures , if you don't find it straight away in the morning or so


regarding source resistance .... I did check about dozen or so JFet groups and in all cases 27R ll 100R pot combo was adequate ..... but it seems that switch to 39R ll 100R pot will cover all possible Idss cases

I did some editing of post #1 , will proceed .....
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Old 5th November 2018, 09:18 PM   #65
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ill do meditation on PCB tomorrow, either i come back with bad joke or pictures : )
tnx!
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Old 5th November 2018, 09:23 PM   #66
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Babelfish M25, SissySIT - general building tips and tricks
dunno did you got Babelfish M25 or straight SissySIT package ........ so polarity (type) of mosfet is important ..... same as proper orientation of 7805 - they aren't mounted same on L vs. R channel
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Old 5th November 2018, 09:29 PM   #67
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i made that supernice cableends i saw in your pics, from soft wire with hard wire end, i used laquered 1,4mm, i of course sanded
them but they seem to be cold (soldered) even if solderpoint looks nice,
thats work for now : )
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Old 5th November 2018, 09:39 PM   #68
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Babelfish M25, SissySIT - general building tips and tricks
Quote:
Originally Posted by noelectrix View Post
i made that supernice cableends i saw in your pics, from soft wire with hard wire end, i used laquered 1,4mm, i of course sanded
them but they seem to be cold (soldered) even if solderpoint looks nice,
thats work for now : )
explain , what you mean - which cable ends I made ?

those shown in this very thread are nothing else than regular cables stripped on ends little longer , then covered with heatshrink - simply because I hate to see even slightly melting cable isolation ....... heatshrink is just even more shrinking , and still looks nice
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Old 5th November 2018, 09:46 PM   #69
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ah, the i saw it different, i really hate to fix 1,5mm cable in tiny holes, so i took a superfine "Lize" from a cable, wound a hardwire peace at the end of the cable and soldered them together, sound comlicated or no good, but i show pics then, i like it
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Old 5th November 2018, 09:50 PM   #70
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Babelfish M25, SissySIT - general building tips and tricks
aha , I got it

you did same as I did on Papa's Koan M2 , pics in my blog ........ and probably everywhere

tip: for thick wires , I'm always using screwdriver-like solder tip , around 8mm long edge , temp. set at 380-400C

Papa’s Koan (M)2 , an amp for living room | Zen Mod Blog

Click the image to open in full size.
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