[pix] [finished] Germanium Preamp

[Moby]

Some S**t happened that's obvious, but  :-X  Yes, PCB looks great and I understand this like example. Am I right? Kubi do we have to do something similar or you will end this? Or somebody else?  :-\

 

[peterc]

One of my upcoming projects is to do a 500 series version of this, I am really into the 500 series stuff.

Peter

 

[VoiceOverMike]

What would be a good PSU for this?

 

[Moby]

What would be a good PSU for this?

Average current consumption for mono module is 66ma, so typical 3 point chip based PSU will work. Same like neve pre PSU, but it will be great to go with some vintage discrete PSU 

 

[3nity]

Kubi i'm thinking to do a single layer layout for Home etchers.
IS that allright with you?
Thanks.

 

[okgb]

Nice work Kubi , i'd buy a pair to support the effort
and i can't even imagine getting to it soon .
the puppet master may have his own agenda , but
don't let that stop you from your good deeds ,
Can i help  ?

 

[Moby]

Kubi, don't you think that some of the capacitors values are bit overkilled? For example C3 can be 47uf ... Did you calculated the values or you just dropped "bigger-better"  I see that most critical value for low end response / phase is output cap C10. For 150 ohm tx primary it should be 1000Uf for flat. Correct me if I'm wrong  ;D

 

[Harpo]

.., but it will be great to go with some vintage discrete PSU 

If you don't wanna cycle yourself, some nice kids might help you

;D

 

[Moby]

Hehe, just go for a ride 

 

[Moby]

Cool Kubi. Can you also explain how did you implemented the input resistance switch. I see that you are explaining something about R1, and that seems reasonable to me but I can't understand German  :-[ Also, did you tried to implement volume control in front of output stage? Overdriving first stage can sound interesting....  :

 

[Moby]

Volker, should we wait for your PCB's  ???

 

[[silent:arts]]

Volker, should we wait for your PCB's  ???

I have been in contact with kubi about this.
kubi is fine with me doing a GroupDIY51X compatible card 
this is great since it will be the first project using the advanced features of the GroupDIY 51X Alliance ;D
but first I will do a prototype of Kubis home-edge version, since he offered me to send me one PCB  8)
if kubi wants it I can do a PCB run of his standard version too ...

(but don't assume to have anything in your hand next week, I'm not that fast)

 

[jensenmann]

Volker, should we wait for your PCB's  ???

I have been in contact with kubi about this.
kubi is fine with me doing a GroupDIY51X compatible card 
this is great since it will be the first project using the advanced features of the GroupDIY 51X Alliance ;D
but first I will do a prototype of Kubis home-edge version, since he offered me to send me one PCB  8)
if kubi wants it I can do a PCB run of his standard version too ...

(but don't assume to have anything in your hand next week, I'm not that fast)

you´d beter kept the original transformer 

 

[Moby]

That's great, I asked just to know do I have to start my own PCB ... I'm not in hurry ;-) So, let's wait  

GroupDIY51X

What's that  ???

 

[[silent:arts]]

you´d beter kept the original transformer 

;D
who knows if this would have been ever happened than ...
and the original one is not 51X compatible ...
and I will find more excuses to feel better  ;D ;D ;D

 

[[silent:arts]]

GroupDIY51X

What's that  ???

details will be published soon
basically it is a backward compatible API 500 form factor with added +/-24V

 

[Moby]

Very detailed answers guys  Thanks  ;D

 

[VoiceOverMike]

Any updates on how this project is coming along?
I rather excited about it.

 

[[silent:arts]]

Any updates on how this project is coming along?
I rather excited about it.

well, this is a rendering of the GroupDIY 51X version:

documentation is nearly done, kubi will etch some prototype PCBs for the stand alone version, we will build and test it.
should be all done before christmas ;D

 

[3nity]

Looks super! hey Volker this wont fit a regular 500 rack isnt it?
IF yes how are you feeding it for 24v??

Thanks.