Re-build Babo Zen (Papa's Zen5 w. jfet inputs)

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Babowana

Babowana

Formerly "jh6you". R.I.P.
Joined 2006
aheadamp.com
Zen Mod said:
that drek looks as Choky drew it.........

:darkside: :devilr:
Click to expand...


Do you think that your profile looks sexy?
When you give us your picture next time, don't forget showing
your front view (and cheeeeeeeeez . . .), and hide your legs.

Okay, here is the amp circuit. Showing only one channel.
DC voltages are not measured yet.

Any question?


:darkside:
 

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Babowana

Babowana

Formerly "jh6you". R.I.P.
Joined 2006
aheadamp.com
Here is the measured DC voltages.
The rail voltages are lower than before due to the reduced transformer secondary of 20-0V. The voltages across source resistors of J310 and 2SJ108GR are the same as before. It is interesting to see that J310 and 2SJ108GR are working exactly the same way as previous one. The gain mosfet bias current however looks lower with about 1.2A than my target value of 1.5A. I might need to readjust it . . . If I judge the sound . . . ? The 1.2A bias is still okay . . .

Any comment?


:darkside:
 

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Vix

Vix

Member
Joined 2003
Babowana said:
Nice to see you, Vix.
If we could bring our diy system and romantic CDS to the mountain music . . .

I'm missing mountain hiking very much!!!


:darkside:
Click to expand...

Thanks.

I like mountain hiking during the day, and nice music with Pass amps in the evening :)

That picture was taken at a hill not far from my hometown. It was a foggy, boring day. But on top of a hill, it was splendid, sunshine all over the place :cool:
 
sandstorm33

sandstorm33

Member
Joined 2006
BABO ZEN PCB'S

Babowana said:
OK . . ., I'm back.
This shows amp boards drawn by hand with a black oil pen,
for the etching.


:darkside:
Click to expand...

What exactly do you mean by "oil pen"?? I have tried drawing traces with resist pens but when result is etched ,traces have pin holes!! Your boards appear to be without imperfection?!!?. Any light you can shine on this would be greatly appreciated .
:confused:

JT
 
Babowana

Babowana

Formerly "jh6you". R.I.P.
Joined 2006
aheadamp.com
Re: BABO ZEN PCB'S

sandstorm33 said:
What exactly do you mean by "oil pen"?? I have tried drawing traces with resist pens but when result is etched ,traces have pin holes!! Your boards appear to be without imperfection?!!?.
Click to expand...


I bought the black-color oil pen from a stationery shop.
I also had few pin holes (because of too long etching time).
But the holes were easily disappeared as I applied the tin
solder on the traces.

I'm still a newbie in making pcb.

Cheers,
 
sandstorm33

sandstorm33

Member
Joined 2006
Re: Re: BABO ZEN PCB'S

Babowana said:



I bought the black-color oil pen from a stationery shop.
I also had few pin holes (because of too long etching time).
But the holes were easily disappeared as I applied the tin
solder on the traces.

I'm still a newbie in making pcb.

Cheers,
Click to expand...

As am I. Thank you for your reply . I will buy a resist pen and experiment. If success is the result I wiil report back to you.

Thanks again

JT
 
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