Aleph 30 the best choice of C1 C2 C3 on brian gt PCB

[tonimxp]

toni relax

goal is to have 3-5mA there

you're safe with 2x1k5 if positive voltage is near 15V

so - everything from 750 to 1k5 will keep you in ballpark

Sorry but for an aleph 30 supplyed with +25V 0 -25V what i would be done😕
I have to change..... o i have to not change.....this is the problem!

 

[Zen Mod]

for Aleph 30 - just look at usual Masterpiece - Babelfish J



(25-4*)V / 5mA = 4K2

so , say 2 x 2K2 or 2K1 .................... everything from 1k5 to 2k2

*4V is c-e voltage of small bjt

 

[tonimxp]

for Aleph 30 - just look at usual Masterpiece - Babelfish J



(25-4*)V / 5mA = 4K2

so , say 2 x 2K2 or 2K1 .................... everything from 1k5 to 2k2

*4V is c-e voltage of small bjt

Ok! my friend now is again clear!🙂
Many thanks!😀

 

[vivanco]

I am positively shocked😱

in my mini Aleph I made the following changes :

i state that the power supply is constituted by 18-0-18 VDC with filter CRC 60000uF / five parallel resistors 3.9 ohms 3W

1 - substitution of the value of R14 and R16 with 750 ohms
2 - replacement of C2 (there was a 220uF panasonic FC) with two gold Mundorf silver oil 22uF and two Arcotronics MKP 10uF, mounted in parallel to achieve a total capacity of 64uF (I've assembled them all on a breadboard and with solid core pure silver I connected to pads of the pCB)

result: never heard anything like it so far

 

[Zen Mod]

1. irrelevant

2. more , the merrier

 

[vivanco]

1. irrelevant

2. more , the merrier

I'm sorry, but I do not understand your answer😱

 

[Zen Mod]

1. change of these resistors will not have influence of sonic
your amp was perfectly OK with 2x1k5 - on 18V PSU

2.that cap must be good one ; better cap , better sound

 

[vivanco]

1. change of these resistors will not have influence of sonic
your amp was perfectly OK with 2x1k5 - on 18V PSU

2.that cap must be good one ; better cap , better sound

zen ok, now everything is clear to me,,,,the magnificent sound is obtained by replacing the electrolytic capacitor with polypropylene quality and the removal of C1 and R10.
thank you for all the advice you dispense.😉

I ask one last thing, if there is any downside in having changed upon 220uF with 64uF,,or for the fact that the 64uF are high quality, do not you feel the decrease in capacity

 

[Zen Mod]

just put that 220uF back , along with these caps

it's clever to have low impedance AC path there

I;m using 470uF Elna/125C (dunno which series) , bypassed with 100nF MKC

even better - leave 220uF in , and put just one Mundorf in parallel

then listen

then desolder Mundorf and put hefty MKC instead and listen

I think that you'll find better place for Mundorfs , where you need both capacity and high voltage

 

[vivanco]

hefty MKC

What do you mean?

 

[gadut]

short C1 you don't need it

pull out R10 , you don't need it

for C3 use decent cap

for C2 use Silmic , bypass it with 100nF MKC (polycarbonat)

- Why remove C1 & R10? with assumption that every single parts that PAPA designed have their function, is this C1 as DC blocker?

Silmic is good for Papa

it's good for me too , especially bypassed with MKC

just say that most expensive Blackgate isn't better in that position

been there , done that

I just got 6 BG F 220uF, it's interesting that you prefer Silmic rather than BG where most people will do the opposite way 😀 I'll try this tweak later. Which MKC do you use? Vishay ? it will cost you more than Silmic, not a balance thing to me if bypass caps have higher price than main caps 😱

 

[Zen Mod]

- Why remove C1 & R10? with assumption that every single parts that PAPA designed have their function, is this C1 as DC blocker?



....

read this:

Mu koan:

Q: Does puppy dog have Buddha nature?

A: Mu

😎

regarding MKC - I was saying that - for my ears - BG+MKC=Silmic+MKC

BG needs MKC

well- I'm not always thinking about price

What do you mean?

hefty - hefty - WordReference.com Dictionary of English

 

[tonimxp]

- yes ; see Babelfish J sch

- foolproof reasons

Hi!ZM ,please can i know what are your personal opinions about aleph 30 vs aleph j Babelfish?
I understand that the question could be embarrassing, but know that you are not obliged to reply!
I do not get angry
🙂

And.....your personal opinions about aleph p1.7 vs bosoz?

 

[Zen Mod]

simple
Aleph J is better than older cousin Aleph 30

Babelfish J is nothing else than derivation of Aleph J

both p1.7 and bosoz are easy to made and useful and necessary step in learning how to build and how/what to listen

 

[tonimxp]

simple
Aleph J is better than older cousin Aleph 30

Babelfish J is nothing else than derivation of Aleph J

both p1.7 and bosoz are easy to made and useful and necessary step in learning how to build and how/what to listen

After aleph30 ,i'm thinking to build a preamplifier with the same signature (Mr.Nelson Pass),so..my problem now is to decide if to do a Bosoz or a Alpeh p1.7.
If i think at minimalism i think at the bosoz......have you had the possibility of compare them ?
If yes can you say me something about?

 

[Zen Mod]

build them both at breadboard and choose

whatever someone can tell you between these two , that saying isn't hearing

 

[gadut]

ZM, regarding your long journey with component testing, do you have any suggestion on resistor choices?full metal or full carbon or mixed?which R is metal or carbon?

also choices from dale,takman,holco,kiwame, or other brand? although subjective listening result will lead to some taste anyway, but at least it can give overall review

 

[Zen Mod]

I'm not loosing sleep about that , on that level of voltage

plain MF resistors , if you ask me

spend time/energy on more joyful dilemmas

 

[boywonder]

My square wave isn't square....

I just noticed that my mini-A has a lot of ringing on a 10Khz square wave.......

Do I need to increase the value of the gate R's or something else?

 

[Zen Mod]

which exact schm , which voltage , which outputs , which pcbs ?

my crystal ball is muddy these dayzzzzz