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Preamp schematics
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Points: 6784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tweeter box Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2010 at 11:03am
Originally posted by Shamrock Shamrock wrote:

Tweet: Well, Im not gonna build a valve pre, because thats a bit over my head right now... And by the way you have no idea why I want to check this schematic out... Dont really know why I bother telling you but why I want to have it is because im studying electroengineering at university and trying to figure schematics out is a good way to learn. Also I want to check how the Linkwitz-Reily filters are designed in a pre actually in use... So dont you worry, I WONT COPY Tubbs design, Im just interested in the basics of it to be able to build myself a simple pre to get my sound started...


 
well whateva your reasons are dont u think you should ask the preamp designers for 'there' schematics, i mean after all you did ask for the Tubbys n Mostoc schematics specifically!! and both of there products are currently in production and not discontinued
 
Originally posted by Il_Duce Il_Duce wrote:

Hi Shamrock,

Yes you are correct that there is no such thing as copyright on a schematic - FACT - only copyright on printed circuit board artwork/layout. There is nothing new about most circuits, nothing original either. How many ways are there to string resistors and capacitors together? - Not alot. So with regards to the other comments here, I wouldn't pay them any mind. Also it is perfectly legal to reverse engineer a circuit - FACT - so whether you copy a "Tubbs" design or not is really a moral rather than legal dilemma.

I think if you do a bit more research, you'll find that the schematic that Joseph Redemption posted on here will allow you to build a preamp minus the valves - just a bit bit more research and you'll be there!!
 
interesting, never knew the legal side of it
 
Originally posted by PISSHEAD PISSHEAD wrote:

Originally posted by fat_brstd fat_brstd wrote:

Im fairly certain that schematic for the pre with the valve amps is the one he created after taking apart a tubbys one and modifying it. There is a story that goes (and i dont know if this is true) that Russ D was over in switzerland using that modified pre and he couldnt get enough bass out of it so they switched to a standard tubbys.


Yes but didn't Joe say that it was because they had to connect the pre-amp into another seperate crossover which caused a conflict of frequencies.


 
that sounds weird, why would they "have" to plug into another crossover? Confused


Edited by tweeter box - 17 September 2010 at 11:04am
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Nitz V1505 View Drop Down
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Points: 1719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nitz V1505 Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2010 at 11:33am

Could be cos they had a 3 way pre but needed to split the bands further or tune to their desired frequencies.
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Originally posted by tweeter box tweeter box wrote:

that sounds weird, why would they "have" to plug into another crossover? Confused
 
Its not that weird at all. I go from a 3 way tubbys into a 4way digital lms. This gives me a 3 way control over the sound but I get the benifits of having a properly tuned 4 way system.
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Points: 163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote russ d Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2010 at 4:41pm
no external crossover was used when we checked the modded pre-amp, we unplugged and used the same cables from amps for both units.
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Russ was the unmodified pre heavier?
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Points: 163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote russ d Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2010 at 11:52pm
Originally posted by Nitz V1505 Nitz V1505 wrote:

Russ was the unmodified pre heavier?


it most certainly was, the modded (which was`nt a valve modded, but had other component `upgrades `) sounded weak and kinda wishy washy, almost like the bass was out of phase, which was`nt the case with regards to the system which, as said, played fine with the unmodded pre...i remember really trying to ramp up the bass controls to get something happening but it was a no go.
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bur brownsDead as much drive in them as a reliant robbin unless you correct them then your defeating the objective 
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The old saying comes to mind-If it aint broke than dont try to fix it!!!! Maybe Joe added valves to the o/p when he realised the drive problem. The phase issues sound x-over related to me . Give thanx for the info Russ.Star
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