µrei 1276

[Steffen]

... a few pics of my latest, stereo 1176 with neve 1272 o/p....
I built this for a friend who came up with some special feature requests:
special fronpanel labeling (intensity/generated instead of input/output etc.), a 2nd set of distortion trims switched by the THD switch on the frontpanel. so one can have a clean setting and a dirty setting. works extremely great on rhodes...:grin:

steff

 

[radiance]

You did it again! Very nice, very nice indeed.
How's the tracking on the stereo pots?

 

[gyraf]

:shock: ..you did it.. AGAIN...!!?!??

:grin:

Jakob E.

 

[Gustav]

[quote author="Steffen"]... a few pics of my latest, stereo 1176 with neve 1272 o/p....
I built this for a friend who came up with some special feature requests:
special fronpanel labeling (intensity/generated instead of input/output etc.), a 2nd set of distortion trims switched by the THD switch on the frontpanel. so one can have a clean setting and a dirty setting. works extremely great on rhodes...:grin:

steff

[/quote]

Looks amazing.
Where did you get those big switches ?

gustav

 

[kiira]

Wow that is so so so professional looking. I wish I could make my wiring look that neat inside, it always looks like abirds nest.

What does a meter measuring 200 Volts do though? The hotness of the performance? :roll:

 

[daArry]

serious looking stuff again steff! :thumb:

a 2nd set of distortion trims switched by the THD switch on the frontpanel. so one can have a clean setting and a dirty setting. works extremely great on rhodes...

how's that work exactly? are u switching between 2 seperate distortion trimmer pots?

 

[nrgrecording]

its not a urei - its a µrei :thumb: thats cool!

i love it

 

[chrissugar]

Steffen, as always your new box is amazing.
Very good job.
:thumb: :thumb: :thumb:

chrissugar

 

[matthias]

damn great work !!! all thumbs up!! :thumb: :thumb: :thumb:

is that a gml-like power jack on the back ??

why do you use completely relais for switching??
don't you trust in the contacts of the lorlin/alpha switches??


mat

 

[peter purpose]

Top stuff Steff... :thumb: :thumb:

Charge and reshape eh? :thumb:

 

[Kev]

:green: :thumb:
Steff doesn't say much

but as Jedi DIY Master he doesn't need to
excellent as always

 

[jensenmann]

Steffen, you´re killing me
:shock: :shock: :shock:
WAHNSINN
:thumb: :thumb: :thumb: :thumb: :thumb:
Jens

 

[chrissugar]

Hey Steffen,

About the THD switch. How did you do it? Some DC into the output transformer? Or maybe you switch in some tantatum capacitors for adding some harmonic distortion? Or change the feedback?

chrissugar

 

[edanderson]

re: THD switch...

i'd guess that he is switching between two GR fet biasing trimmers. plenty of distortion to be had from "mis-biasing" the fet -- a variation on the "all buttons in" trick.

ed

 

[jho-audio]

Is there any reason why it would be bad form to replace that trimmer with a pot on the front of the chassis and dial in the biasing for extra flavour?

 

[tubemonkey35]

Damn!!!

 

[Steffen]

[quote author="daArry"]serious looking stuff again steff! :thumb:

a 2nd set of distortion trims switched by the THD switch on the frontpanel. so one can have a clean setting and a dirty setting. works extremely great on rhodes...

how's that work exactly? are u switching between 2 seperate distortion trimmer pots?[/quote]

yes, there are 2 sets of 100ohm distortion trimmer, switched by relay.
gives a big thump on the output when switching...but hey this is a "dirtbox" anyway :green:

steff

 

[Steffen]

[quote author="matthias"]damn great work !!! all thumbs up!! :thumb: :thumb: :thumb:

is that a gml-like power jack on the back ??

why do you use completely relais for switching??
don't you trust in the contacts of the lorlin/alpha switches??


mat[/quote]

the powerjack is a 5 pin xlr....yepp very GML like ;-)

the resistor ladders are relay switched by a single control switch. otherwise I had to use a 9 layer switch for ratio control (2x2 for the ladders, 2x2 for slam mode, 1 for meter off )

Where did you get those big switches ?

www.reichelt.de

look for KS4

Is there any reason why it would be bad form to replace that trimmer with a pot on the front of the chassis and dial in the biasing for extra flavour?

should work fine, I´d like to see a center detended pot there with click at zero (or "normal") distortion.

and thanx for the nice replies!

back to the workbench....

steff

 

[Steffen]

ehhhh...does somebody know why the automatic picture resize doesn´t work today? sorry, but yesterday they where automaticely resized to 300x200...strange

 

[Steffen]

[quote author="Viitalahde"][quote author="Steffen"]yes, there are 2 sets of 100ohm distortion trimmer, switched by relay.
gives a big thump on the output when switching[/quote]

So the thumps comes when the distortion trimmer is lifted from the circuit for a nanosecond?

Make sure you next time simply switch a 2nd trimmer in parallel with the first one. :wink:

Nice anyway, and if the client is happy then what the hell. :thumb:[/quote]

no, it´s more the quick change of the R value...

the thump sounds more dramatic than it is in reality. the trim changes the dc feedback of the circuit a little, so there is a small "plopp" at the output. but the dc change feed also to the gate of the fet..so all gain breaks down for a moment and the circuit need some time to settle. I guess there´s not much you can do about it (maybe implementing some vactrols? :green: )


steff