Budda SD45

[Leevi]

I would like to hear some technical info about Budda Superdrive 45.
Even better if there is a schematic available. Is the circuit based on JTM45 but it is
using KT66 instead of EL34?
/Leevi

[The_Gaz]

Shazam!

[Willabe]

I think the 10R across (to ground) the 2@50uF caps at B+ node A and the 10R across (to ground) the 47uF cap at B+ node B are typos/wrong.

They would bleed off way to much B+ voltage and current.

Also the 1K B+ droping R between the plate (A) node and screen (B) node says 50w. 5w would be plenty.  
                  


                       Brad      

[Leevi]

Thanks for your replies and schematic guys!
Is the only difference between SD45 and SD80 the number of power tubes (2 vs 4)?
/Leevi

[The_Gaz]

Thanks for your replies and schematic guys!
Is the only difference between SD45 and SD80 the number of power tubes (2 vs 4)?
/Leevi

I assumed so. Either way, the SD80 has some very interesting tricks going on.

And yeah, there's surely some errors (this is not an official schem, of course), but you can get a gist of the amp.

[FYL]

Shazam!

Mazahs!

Is this the first amp with a grounded phase in the PI ? Too many errors and typos in the schemo...

 

[Willabe]

I thought there was something funny about the PI.

I thought maybe it was a para-phase drawn differently than the usual.



                    Brad   

[sluckey]

Is this the first amp with a grounded phase in the PI ?

Please explain. I don't see what you're seeing. Looks workable to me.

[The_Gaz]

I dunno, I guess the typos are problematic if you're trying to do a paint by numbers clone or something, but for someone who can recognize the errors, it's just interesting to see the overall typology (pun) of the amp. I think the simplicity of the channel switching, PI,  and cathode bias, and dual stage gain pot were particularly interesting - more than just the boring 'ol Marshall mods we're used to seeing.

[Willabe]

Everybody makes mistakes/typos on schemos, even the guys who do it for a living. I know I do.


                    Brad        

[FYL]

Please explain. I don't see what you're seeing. Looks workable to me.

My bad. Typed too fast w/o considering the 270K load resistor between PI and bottom half of the PP...