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Building a Pre Amp

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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2013 at 10:20pm
er do not really think a digital 9088 will sound anything like what is required nice idea though. I do not like digital kit too much I prefer analogue. we bought a lot of FDS388 when they first appeared on the market sounded awful sent them back or sold them on removing them from hire stock. tried many others as well Dynacord XTA now use FDS360 DDA500 all heavily modded nice warm analogue really see little point in doing like a pal does takes Analogue to LS9 or MC7L then sends it analogue to XTA or KT then analogue to his Labgruppens  pointless!!! keeps changing domains a very bad n sad thing to do
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shagnasty Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2013 at 10:27pm
I've done a few link-up where I have taken the outputs of a pre-amp and mixed them on a SW9088 so the system could control 721s,718s + Floodlights all with Turbo-spec crossovers but still have the control the pre-amp offered, worked amazingly well and let me sleep while the system was happy, I understand the analog/digi argument and as such don't use LS9s/M7CLs as their is no point in paying what I charge and not giving viable tools for the job, I am sure every Bingo house needs an LS9, do don't bring a Bingo rig to a gig.
A properly set-up 90xx or Blu is more than a match for a DDA-500...
Smile 
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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2013 at 10:38pm
depends what you mean by "More than a match"...it is still digital so loses some of the information as it can only achieve 72% oof it no matter what sample rate or bit depth you use Nyquist will tell you that.
It may be clean with a low noise floor etc But analogue well designed is always more pleasing to the ear. Music is not all about specs but about Timbre or character hence wrong is sometimes more right than right which often sounds so wrong.
My analogue FDS DDA sound really good using Burr-Brown upgrades not cheaper TLO or NE devices FDS give you a good level of control over a band with the breakouts I have dynamic feedback integration on mine an idea I nicked from Bruce Howze after having too much grief with the dodgy SC22 controllers we had and not finding the DSC's not much better
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Nitz V1505 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nitz V1505 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 10:28am
Originally posted by SMP SMP wrote:

Building a "Bottle" pre-amp is easy enough depends on how sophisticated you want it to be. certainly easier than a power amp. EF86 are a good basis for a modern low noise circuit then use ECC82/83 for line driverĀ  always a bit prroblematic finding Carbon Resistors(would never use MF types myself) and decent caps with a good power factor as well as working voltage as the modern ones are mostly low voltage types as well as having a poor power factor. I always empty any drawers of Carbon Resistors when ever I come across them cleaned out Cricklewood Electronics of lot of their stock some time ago. you just gotta search any surplus stores you may find


I got a circuit diagram for a grounded grid coscode (I think) phono preamp which has got very low noise and THD for a valve and even puts a lot of top op amp designs to shame.
I love the idea of having a full valve set but would prove to expensive in this time. I reckon with a valve pre used with my transistor amps Ill get the sound Im after.
LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 1:13pm
I have given a fleeting thought only fleeting mind to building a simple line driver using valves just to give a signal a "Valve" sound. Perhaps I will get around to it at some future point. just have so many other project on the drawing board at present that it gets pushed to the end of the queue. there is absolutely no reason why a Valve would not or cannot put a "Solid State" circuit to shame if well designed with a good PSU it can perform with excellence. I have also seen MOSFETS used in a similar config Topology to Bottles in Class A auddio amps with good results. came across a Japanese Bespoke Builder some years back building transformer coupled types running on Battery power using just one or two power devices thus arranged producing very valve like results. do not recall his name only knew him as "Bay" a friend of one of my Mentors the late Dennis Tryckett a great Valve man who thought me a great deal about bottles

so crack on I say give it a go you may like the results as well as the journey



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nitz V1505 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 6:06pm
Got a Berry ultragain pro warming up the signal at the moment and it is definately one if their finest offerings. When I do get round to it Im thinking separate psu and hardwired circuits. Id use a cathode follower op stage for low impedance.
LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 6:27pm
Hey Nitz...has that berry got a tube in it then?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRE4U2NV Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 6:51pm
Dennis Tryckett i was taught a great deal by this man when he was in bell st Clap 
to many secrets to reveal here WinkEmbarrassed
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Nitz V1505 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nitz V1505 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 7:37pm
Originally posted by SMP SMP wrote:

Hey Nitz...has that berry got a tube in it then?


Yes it has 12AX7 in the preamp section but the eq and hp filters are solid state. Sounds good and is very clean suited for both studio and live work. But I need a unit for on sub to add that growl im looking for!!!!

Edited by Nitz V1505 - 15 May 2013 at 7:37pm
LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....
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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SMP Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2013 at 8:25pm
ok that means I know who you are!!! how you doing? still messing around with hot glass tubes I take it?
still miss him taught me much about tubes andSmile Bees!!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris I Rockas Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2013 at 3:37pm
Greetings Nitz V1505 and SMP....
 
Your talking about tubess in the signal chain prompted me to refer you to this little "exchange" some years back. Enjoy the Pic!
 
Think you can, you will. Think you can't, you won't.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote championdrei Quote  Post ReplyReply Direct Link To This Post Posted: 15 October 2014 at 6:29am
Nice to see the interest in building pre amps
If I ever do build one I want it to be like a barracuda.
even though barracuda doesn't build anymore his pre amps have a unique sound to them like the tops for instance. I haven't heard 1 pre amp sound as criss as a barracuda.

if only I could be barracudas apprentice
respect
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