which pass design to build

[slr 5000]

hi all
i would like to build a nelson pass amplifier
it must be ballanced and will need 100w or more
to run some active 2/ways which use a eton 12' hexacone for bass and a manger transducer for mid/high

i'm using a hypex ucd 400hg for bass so the pass amp will only be driving the mangers

i'm after the sweetest class a amp i can get

i'd like some reccomendations including where to get the boards and parts

thanks for any help/advice in advance

cheers

[Williams Audio]

hi,
www.kk-pcb.com will be very help ful with pcb and think about heat sinks
think big
best regards
williams

[slr 5000]

thanks williams

ive never seen that site
it has everything im after but now i am confused
there is too much to choose from!!

cheers

[slr 5000]

hi all
has anyone here built any amps using the pcb from this site

i like the look of the aleph x and the zen x
are they the same as nelsons or are there differences

cheers

[smario]

There are many alephs (amps and preamps) built with these boards. Look at the "Misc Gallery" on passdiy.com.

[joka22]

Hi i seen one board on that site that has 45v -v and 45v v+ i got a transformer that produces 43 volts at it secondary without any caps this is with transformer alone. is the 45v amp board suitable for me.

Thank You

[smario]

Originally posted by joka22
Hi i seen one board on that site that has 45v -v and 45v v+ i got a transformer that produces 43 volts at it secondary without any caps this is with transformer alone. is the 45v amp board suitable for me.

Thank You

Boards would work fine. PSU made with your trensformer would have cca 60V (without load) and cca 55V with load. If this transformer is powerful enough and if you put CRC or (CLC) filter in PSU you can build Aleph 4.

[Williams Audio]

hi all,
do not worry, this is a good quality pcb.
the pass amps are very good amps!!! so you can go ahead and start.
we are here to help, think how to dissipate the heat, is very important for the long life of the amp.
use good metal case to hold the heavy trafo and caps.
good luck!!!
Best regards
Williams

[joka22]

has anyone tried the motor bike engine heatsinks to cool thier amps?.

They should easily get rid of heat.

[GRollins]

Please note that the kk fellow is not well thought of by all, as he appears to be making a profit off of Nelson's work. This isn't good. His 'support' record is spotty at best. If you search here at DIY, you will find numerous instances where he has sold boards, then left the buyer sitting high and dry when it comes to questions.
If you buy from kk, you are incurring bad karma that you'll have to work off in your next life. Hard to do if you come back as a slug.
Water cooling works just fine. I've been doing it for years. There is at least one other thread active at present discussing water cooling.

Grey