Mix Bus Compressor from scratch

[DaveP]

Oooh, the new tube dbx encoder/decoder

Are you saying it could give a kind of Dolby pre-emphasis?
best
DaveP

 

[ruffrecords]

Are you saying it could give a kind of Dolby pre-emphasis?
best
DaveP

No, more like the wide band wide range 2:1 compression that dbx uses.

Cheers

Ian

 

[DaveP]

Working out the compression:-


And the threshold v Compression:-


So the most useful setting for the Mix bus is probably about 77% giving 2-3dB compression to glue it all together.
best
DaveP

 

[DaveP]

The top and bottom covers now have ventilation holes.

Just the illumination for the VU meters to finish
best
DaveP

 

[DaveP]

All lit up!

VU meters finished so final photos then the covers go on.
best
DaveP

 

[C.B. - Boudio]

Looks stunning!

 

[thomasdf]

Amazing Dave ! Are these transformers from "Primary Windings" in UK ?

 

[DaveP]

Are these transformers from "Primary Windings" in UK ?

Hi Thomas, I had them made by Danbury Electronics some time ago, but I think they have changed their name to Primary windings as you say.
best
DaveP

 

[DaveP]

These are the final photos for the record:-
Base


Back


Power Supply 1


Power Supply 2


Compressor


Front

I hope you have all enjoyed the journey and thank you all once again for your support.

I will post the final schematics in the next post.
best
DaveP

 

[scott2000]

We need some wow and heart emoji options for the like button

 

[elskardio]

These are the final photos for the record:-
Base


Back


Power Supply 1


Power Supply 2


Compressor


Front

I hope you have all enjoyed the journey and thank you all once again for your support.

I will post the final schematics in the next post.
best
DaveP

Can we expect audio clips?

 

[DaveP]

Can we expect audio clips?

Sorry, I don't have the gear for that, but the new owner might post something if you ask him nicely!
best
DaveP

 

[IBart]

looks great Dave, thanks for posting those pictures

and thanks for all the work

and yes, Elskarido, I'd be happy to run a chorus through it before and after, when it arrives
it cant be a signed artist and even then with a new artists, you cant start putting it online...
but if you want to hear it email me at [email protected]

I have no idea at this point how it will sound
but if it sounds as classy as the UE 100 EQ Dave made me a while back , then I think it'll had some secret sauce

 

[elskardio]

looks great Dave, thanks for posting those pictures

and thanks for all the work

and yes, Elskarido, I'd be happy to run a chorus through it before and after, when it arrives
it cant be a signed artist and even then with a new artists, you cant start putting it online...
but if you want to hear it email me at [email protected]

I have no idea at this point how it will sound
but if it sounds as classy as the UE 100 EQ Dave made me a while back , then I think it'll had some secret sauce

Awesome ! Thanks

 

[gyraf]

over at GS they have a giant mastering compressor comparison thread, with a standardized non-processed audio file for input argument

If you try it on that, make sure to post your result over there as well - they need a bit of variation in their life..

/Jakob E.

 

[IBart]

over at GS they have a giant mastering compressor comparison thread, with a standardized non-processed audio file for input argument

If you try it on that, make sure to post your result over there as well - they need a bit of variation in their life..

/Jakob E.

Cheers Jacob

 

[thomasdf]

Hi Thomas, I had them made by Danbury Electronics some time ago, but I think they have changed their name to Primary windings as you say.
best
DaveP

Thanks Dave ! I have used their transformers for hifi tube amps with great success. They offer customs jobs but I never heard back from them the two times I asked for a 600 ohm output to one of their designs, as opposed to 4-8-16 outputs. Hence my curiosity !


I will also add : AWESOME build, as usual ! Bravo to you, Dave ! I am amazed, ( as usual ) Cheers

 

[Analog_Fan]

If you dropped it with a transistor it would be burning exactly the same amount of power.

But you got advantage, you can aim pretty exact for the 270 (volts) and not need to burn it.

a week or 2, i saw some "hindy" guy talking about capacitors, he calculated +/-10% of 220V grid tension.

 

[Analog_Fan]

EXACTLY
best
DaveP

Some German Doktor made a set of tools for switching power supply's

http://schmidt-walter-schaltnetzteile.de/smps_e/vgw_smps_e.html



Depending the switching frequency you choose it gives you the Inductor value you need.
So you can use a 9 V transformer in reverse to create 275 V and don't burn anything (pretty much).
safe alot of weight.

This second tube side chain of the La-2a is rare
: (.

 

[Rob Flinn]

But you got advantage, you can aim pretty exact for the 270 (volts) and not need to burn it.

a week or 2, i saw some "hindy" guy talking about capacitors, he calculated +/-10% of 220V grid tension.

With the transistor you still burn the power up. Why do you think the transistor gets hot. Hint "transistor" is short for "transfer resistor". As others have siad you get a filtering effect with the resistor anyway.