ALEPH2 Power transformer

[paradigmatik]

I've found a HAMMOND 2 x 30V 1000VA for 60 CA$ less than a 2 x 33V 1000VA...Will the 2 x 30V do the job or...?

[kilowattski]

No, actually neither will do the job fully. The Aleph 2 requires +/- 45 Volts for full output. A 30 volt transformer will give about 42 volts peak AC. If you subtract for losses in the rectifier, about 39 volts DC is more realisitic with some big filter capacitors.

[dhole]

On the subject.....

I have two 35-35 625 Va ILP toroidals I would like to use for some aleph 2's .Do you think they will be able to hack it ?.... perhaps as a stop gap measure until I can save money for big trafos...?
having used some ILP toroidals in my alpeh 5s I am pretty sure they are under spec'd and are very well made. The 500Va's dont get hot at all in my A5s.

Dave

[paradigmatik]

No, actually neither will do the job fully. The Aleph 2 requires +/- 45 Volts for full output.

Ok for the 30VCT but...

By doing the following :

(33 * 1.4142) - (0.7 * 2) = 45.2686

Won't I get my 45VDC after the caps?

[GRollins]

Don't worry about a volt here and there. I've got "Aleph 2s" that run on rail voltages anywhere from about 42 to 50V. The circuit is stable. There will be differences in maximum power output and in heat dissipation, but it's not the kind of thing that is going to make or break you.
After all, you wouldn't be so silly as to run the amp into clipping, would you...?

Grey

[kilowattski]

paradigmatik

I agree with Grey that a volt here or there will not matter. If you have 30 secondaries, why are you doing the calculation with 33 volts?

[jleaman]

Originally posted by kilowattski
paradigmatik

I agree with Grey that a volt here or there will not matter. If you have 30 secondaries, why are you doing the calculation with 33 volts?

Maybe he pluged them in and when he plugs them in itis not actually 30-0-30 its ac 33-0-33 : O)

Just like mine when i plug my stereo in the am i get 18.4v rails at night time i plug it in and i get 19.7v rails weird eh

[paradigmatik]

I was asking for the better choice so this means that I have not already buy it...but if you tell me that the circuit is stable from 42 to 50 VDC, It's ok and I thank you guys for the tips!

Regards

[ScottRHinson]

Originally posted by jleaman



Maybe he pluged them in and when he plugs them in itis not actually 30-0-30 its ac 33-0-33 : O)

Just like mine when i plug my stereo in the am i get 18.4v rails at night time i plug it in and i get 19.7v rails weird eh

Ever measured the mains throught the day with a DMM?

I've done it with a datalogger that tracked both voltage and frequency...they do vary you know. 5% to 10% voltage change is within normal range.

Scott

[jleaman]

Originally posted by ScottRHinson



Ever measured the mains throught the day with a DMM?

I've done it with a datalogger that tracked both voltage and frequency...they do vary you know. 5% to 10% voltage change is within normal range.

Scott

Yes i know.. that is why i said what i said..

I have 2 trannys for sale really cheap too..

Made just for the Aleph 2's