Jfet Bosoz?

[Zen Mod]

................
(no I didn't expect you to build it choky! Didn't I see you with some Krell clone PCB's?)

JJ

yup;
KSA100 pcbs-present from my friend AR.......I'll build it just because I can,not because I need it

This circuit, I think, is more like an Aleph "J"P -- I am not sure if the aleph P also has lower distortion with more source resistance -- maybe one of the gurus out there can confirm.

not that I'm guru........just not too much modest student .....with more source degeneration - local feedback is greater,so also distortion is decreased ; where is sweet spot ? that's really matter of compromise -what you need -greater OLG or lesser already small distortion....ratio between OLG and CLG or local feedback and overall feedback......for my ears -too much of both aren't good

If you are going to use this with an Aleph 30, you might take a look at increasing the source resistance to reduce the gain. (I am assuming you are using this with a CD player not vinyl).

I already build X-CSCCSWHATEVER BOSOZ,in fact -Chokyfied salvaged pair of KK's pcbs far Balanced BOZ or what it really was.........that was a favor to little less xperienced friend who spent a little fortune on parts and thing just didn't work........
now he is a happy camper ;

this (jfet) iteration I'll not use for anything ;
I'll make toob susy to compare with my-for now - reference WOT preamp........I have some other intention with tiny jfets,besides Babelfish thingies

we'll see for vinyl; I have plenty of TTs,so I'll certainly make not just one new phono preamp;LR EQ tube one is a must,all other can be just for fun

The BOSOZ has lower distortion with reduced gain (if you reduce the gain by adding source resistance, that is.)

I wrote already.......depending on taste ; no free lunch

Anyway, if your CD player is putting out 2 volts, I think you only need about 6dB of gain (if that) to get full output from the Aleph 30. I may have to dig up my tutorial sheet on dB calculations.

depending what speakers are,..........and-what if someone want to use line stage like this for FW4?
my spks are almost sensitive as good mic........

The fact that you have balanced sources is a benefit. I saw some problems with unbalanced to balanced conversion with the BOSOZ. But then, this is not really a BOSOZ.

problems can be only if you didn't match impedances .........

 

[Zen Mod]

that's for babo

pretty tired now-I'll double check it tomorrow
if someone see something funny-just say so.........

 

[Babowana]

pretty tired now

I know you are tired.
Babo singles (2SK370) not really to be matched as there are
the caps blocking dc to ouside world. The matching is always
preferable tho . . .

I'm sending you some of 2SK370 as a small gift pakage. Try them.
JJ is complaining you not building any.

JJ, I have learned many different things in this place,
I'm just trying to return part of them.
I always have weekend, and I'm going out for beers, cigars and
live music -- Blues, Jazz, Salsa . . . when Papa spends time in
the kitchen ^^.
Papa! life is short, enjoy too! ^^.

 

[apassgear]

Hey Choky,

Why would you need 4K7 resistors at the input?

Toob guys usualy don't use them if they can be avoided

Cute circuit BTW

 

[Zen Mod]

Hey Choky,

Why would you need 4K7 resistors at the input?
.............

ya must be joking me...................

 

[Zen Mod]

for babo-checked

if someone see something unusual,I'm dumb

 

[apassgear]

Now it makes sense...

 

[apassgear]

Those 1u caps seems rather big for the purpose to me, I would test something smaller like 0.1 if you are looking for noise suppresion.

 

[Zen Mod]

Now it makes sense...

 

[Zen Mod]

Those 1u caps seems rather big for the purpose to me, I would test something smaller like 0.1 if you are looking for noise suppresion.

you're right.....I have u22 in Babelfish,along with 33K;

but-it's pretty irrelevant-1u or u1 if cap is of good quality

 

[apassgear]

babo is or or

 

[apassgear]

but-it's pretty irrelevant-1u or u1 if cap is of good quality

not the same for the purpose... but I'm sure we could not hear the difference for that matter... so be it...

we could go with the digital guys for oppinions...

BIB?

 

[Zen Mod]

....................

we could go with the digital guys for oppinions... ................

why?
I'm still listenin' with my ears ,not with theirs

BIB?

almost always

 

[Vix]

I was thinking about deleting input caps and makin' it with negative rail. One more change, can CCS be LED referenced? By the way, I'd increase the input resistor to 10-20 K and feedback one to 47K

Choky, can you help with a schematic, I am not good at drawing...

 

[Zen Mod]

I was thinking about deleting input caps and makin' it with negative rail. One more change, can CCS be LED referenced? By the way, I'd increase the input resistor to 10-20 K and feedback one to 47K

Choky, can you help with a schematic, I am not good at drawing...

you mean -babo- dedicated with dual rails?

 

[Babowana]

Babo should be with single rail ^^.
No time for beer tonight, and no sleep either, because of the
reason given in another thread ^^.

 

[Vix]

you mean -babo- dedicated with dual rails?

Exactly. Dual Babo, with (red) LED referenced CCS.

thanks

 

[Zen Mod]

Exactly. Dual Babo, with (red) LED referenced CCS.

thanks

I like this type of ccs

I can do LED variant later tonight

 

[Vix]

I like this type of ccs

Yeah, I see I guess it works fine.

I have some red LEDs in my junkbox, and every time I digged there I imagined those LEDs doing some useful work (what better than referencing CCS).

Thanks

 

[Zen Mod]

Yeah, I see I guess it works fine.

I have some red LEDs in my junkbox, and every time I digged there I imagined those LEDs doing some useful work (what better than referencing CCS).

Thanks

what about xmass tree?


I mean-out of any amp?

John Cleese: "what's wrong with ol' plain kiss?"