drip V72 pcb

[keithcamilleri]

2 for me...looks amazig

 

[dripelectronics]

thank you !.

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

talked to mr sowter ,
said the 1 uf inbetween coils is possible
but could throw the transformer off balance.
(insert a few transformer high paygrade technical terms)


so i had him continue the design without it.



ill need to come up with a new bass roll off
idea.

grrrrrr

g.

 

[dripelectronics]

works great !

g.

 

[guavatone]

nice one g!

-a tad bit wide, but I am sure you could sell these for folks with Tele modules. I would like 4 if they do what I think they do, freq compensation for the feedback/gain ckt.

 

[MHanson]

So when do I get to order some???

They look great! Thanks for all the work.

Michael

 

[Engfelt2000]

Great project! I'm definately in for a couple!

I've also been planning to put a similar locut on my 312's. Could I use the same values as on this one?


:thumb:

 

[dripelectronics]

probably going to hell for this ........ but ....
heres the finished product

sorry , i just had to add the atoms ..... i love them

(using a stack of 40uf's , two of them can be 10uf's)
plus you can add a 5th ontop for 1st stage filtering if you like.

accidentally melted one my lundals trying to desolder it
from one pcb to the next pcb ,(damn once there in , there in !!)
gotta wait for the new one to arrive , hopfully tomarrow.

before i finalize and send off to be printed.

my sowters arrive in 2 weeks , so ill have the sowter version
out shortly there of.

you know there is enough room , right there in the drip logo area
to add one more transformer for hi-z .

sorry , ill stop , lol

[quote author="Engfelt2000"]Great project! I'm definately in for a couple!

I've also been planning to put a similar locut on my 312's. Could I use the same values as on this one?


:thumb:[/quote]

the hi frequency response can be rolled off , with a seperate
attenuator pcb .

the original bass roll off on the 72 was achieved by a 1 uf cap between coils on the input xformer .
the lundahl version naturally has a small bass roll off , and a nice
gentle slope high roll off .
(pretty much identical to a v72 with the 1 uf cap un bridged)
the lundahls configuration doesnot allow the bridging
of coils in 1:20 mode ,

so some thing like a filter circuit would need to be added
for an aditional bass roll off .

but from what i understand , this can be easily done .

the sowters are very linear , but i find the lundahls frequency response
as is .... do represent several of the v72s that i scaned .

it was my goal to not have it sound too hi-fi.
i.e : linear from 20hz to 20khz.

a nice perk is also you get to use the same power transformer
that the la2a uses , no need for a custom job ..

g.

ps , all outstanding t4s should be shipped on monday.
ahhhhhhh. ......thanks for your patience .

 

[nickt]

First post, first dumb question:


Hey Gregory,

Nice project! but what choke are you showing in the pictures?

It seems a lot smaller than the Lundahl LL1667 - or am I just cross eyed? :shock:

cheers
Nick

 

[dripelectronics]

welcome to the group !.
a pefect question.


that choke is the sowter

9375B , the lundahl is 3 times as big , but a beautiful monster .
havent compared the sound of using different chokes ,
but i do have all 3 in front of me , so i should probably do that
very soon ,

best ,

g.

 

[guavatone]

gregory, I would like to strongly urge that you make
extra space for output cap options.

Some folks like Musicaps or even solens.

Maybe you already do have it set up like that though.

 

[dripelectronics]

that blue cap , is a tc72 10uf electrolytic, (wich works great!)

the solden 2uf cap is actually much smaller and fits
very well ,

lemme see what i can do ,

g,.

 

[analogical]

Holy Moley! :razz:

I'm in for the 72 x 2 with the sowter when you are done!

btw, if a diy manual could be considered 'sexy', you get the award for 2008.

 

[CroatianSensation]

Greg...

You are my idol!


:grin:

 

[kato]

[quote author="analogical"]
btw, if a diy manual could be considered 'sexy', you get the award for 2008.[/quote]

He got the award for 2007 too.

 

[fluxivity]

I'm in for at least 2
Amazing work!

P

 

[dripelectronics]

ahhhh !

thanks ,

been waiting for my sowters to arrive , hopefully this week .
i think it would be important to wait ,

so i can see a side by side comparison vs the lundahls.

g.

 

[Kid Squid]

Greg,

I'm in for a few of these little gems :grin:

Excellent work :thumb:

Steve

 

[RAM]

I'd definitely be in for one of the dual ones!
Nice work Greg!

Rob

 

[helterbelter]

Cool Stuff !

I'd be in for a dual version...... but a mono version will do too, hahaha !

I've got a (Siemens) V72, but the choke isn't working anymore. Could I replace it with the one you're using in this project ?!?

 

[mfdu]

damn mate.

two please.

lovely.

chris.mfdu