what to do whit this ??

[valo]

Greetings I did som Metalwork today.. So what amp to put in the the box ?

My rails will be +/- 30Vdc and i will be using 12x36000Uf caps

 

[firechief]

Is each heatsink one solid piece? Did you assemble this box?

 

[valo]

I did assable the box today, the heatsink is not a slngle pice but 4.. Im gona use a copper plate to join them togetter.. gonna finish the box tomorrow

 

[Nelson Pass]

What kind of amp did you want?

 

[valo]

What kind of amp did you want?

Greetings Nelson

Yes thats the question, Have been looking at the Aleph 5 amp .. I want something that can drive my 4ohm speakers (Audio Physic Sitara) and Im sure Aleph 5 will do the job exelent

 

[Nelson Pass]

I don't ordinarily recommend Alephs for 4 ohms unless
they are biased extra high. Not enough control for many
of the 4 ohm loads, and usually more distortion than I
want.

As a rule I like to use push-pull followers for 4 ohms -
Class A of course.

 

[valo]

finished the Aleph PCB's ten minutes ago If im not happy whit the result i will start all over again with a Class A push-pull amp

 

[valo]

Class A is fun and HOT!! , did power up the Aleph 5 boards today bouth channels is ok but I did measure DC offset channel1, gives me about 20mV and channel2 is about 50mV, Im verry habby about 20mV but is 50mV ok ?

 

[Zen Mod]

everything under 100mV is considered OK

in any case - less is more

 

[valo]

everything under 100mV is considered OK

in any case - less is more

Yepps, but still a litle annoying, I did match every single resistor/transistor for bouth channals to be 99% the same

 

[Zen Mod]

replace R11 with 180R fixed resistor and trimpot of 50 to 100R (both in series)

that's cure for offset

 

[valo]

Thanks for the tip, gona trye that tomorrow

 

[Zen Mod]

take care to have both inputs grounded , while adjusting offset

 

[valo]

yes.. I dident ground inputs when i did measure ofset, i gona measure again whit grounded inputs

 

[valo]

Aleph is alive and I love it

 

[Zen Mod]

yes !

now you need some serious speakers , not these fifi ones

that amp is just from another story ........... or is it fairy tale ?



offset issue solved ?

 

[valo]

Yepps ofset is very good now,about 25mV on bouth sides ..did change agea resistors