Pass Aleph 30 and 60

The only real difference between the Aleph 30 and the Aleph 3 is that the Aleph 30 has balanced inputs to go along with the single ended RCA inputs and a rather conventional looking chassis. The aleph 60 is actually an Aleph 5 built as monoblocks with the balanced inputs and conventional chassis. The best sounding of the Aleph series in MHO is the Aleph 2 but the Aleph 3 or 30 can be very very good with some efficient speakers. Why not try to build a pair of Alephs for yourself. It can be very rewarding. Go to www.diyaudio.com and visit the PassLabs forum to see how.

I would get a aleph-3 over a 'aleph-30'
These second generation 'alephs' originally were to be called Volksamp,a German company that bought the patents for some of the Pass Aleph amps after they were discoutinued.
Its my guess that Volksamp had trouble selling them and turned to Pass to help out.Thus the name change.
The original Pass Alephs have a much heavier and rigid chassis which will lower nasty vibrations and will provide better sound.I think the 30's are ugly with that weird stripe on it.
Get a used Aleph-3 for ~$850 and forget about a copycat amp.
The Aleph-3 will drive your speakers with ease and high spl's.
The Aleph-3 is a classic amp.The 30 never will be.

David,

You couldn't be furthur from the truth. Volksamp was a company set up by Nelson Pass. The reason Nelson started to remarket the Aleph 30 under the Pass Labs name and not the Volksamp name was that they were not selling as well without the Pass Labs name. They were manufactured at Pass Labs in Forrest Hills, California. Look at page 12 of the Aleph 30 service manual. Guess what other company is in Forrest Hills, California? Pass Labs, thats who. You can even see the pass Labs logo on the first page of the service manual. You can download the service manuals for both the Aleph 3 and Aleph30 and look at the schematics and find the amps are identical except for the balanced input connector. Here is the Aleph Page at PassLabs.com: http://www.passlabs.com/aleph.htm if you don't believe me. I have no idea why you concocted this whacky story but it is just not the truth.

Elduende14,

By the way Nelson Pass has set up another company called First Watt. He is marketing a number of lower power class A amplifiers designed for high sensitivity speakers. One of the amps the "Aleph X" is supposed to sound remarkable with high sensitivity speakers. Because your Tannoys are 94dB this is a real option. The scuttlebutt is that these amps will be very reasonably priced. Nelson has stated the amps should be ready soon. The web site is http://www.forstwatt.com. Stay tuned......

Sorry, That is http://www.firstwatt.com

Liguy-I didnt 'make up' this.
I remember reading about all that I wrote before the first Volksamp hit the shores.
There is a difference in design also besides the balanced input.
The 30 has a tad more power than the real aleph-3

David,

Wrong again. The Aleph 3 has a little more power at 4 ohms. There has been some component changes in the Aleph30 but the design is the same. Have a look at the schematics. There are no differences in topology. This is from the Aleph 30 manual:

Gain 20 dB balanced, 26 dB single ended
Freq. Response - 0.5 dB @ 2 Hz, -1.5 dB @ 100 KHz
Power Output 30 watts/ch @ 8 ohms, 40 watts @ 4 ohms
Maximum Output 25 volts, 5 amps
Distortion (1KHz) 0.2% @ 30 watts, 8 ohms
Input Impedance 47 Kohm single-ended, 52 Kohm differential
Damping factor 100
Crosstalk > -80 dB 20-20 KHz
Balanced Input Rejection -50 dB typical CMRR
Output Noise < 500 uV unweighted
Random noise floor 5 uV typical
DC offset < 100 mv
Power Consumption 200 watts
Temperature 25 degrees C. above ambient
Dimensions 17 " W x 15.5" D x 5.5" H
Shipping Weight 45 lb.
VOLKSAMP
Pass Labs
Po Box 219
Foresthill CA 95631
tel (530) 367 4935
fax (530) 367 4984
www.volksamp.com
www.passlabs.com

This is from the Aleph 3:

SPECIFICATIONS
Gain 20 dB
Freq. Response - 0.5 dB at 2 Hz, 100 KHz
Power Output 30 watts/ch 8 ohms
60 watts/ch 4 ohms
60 watts/ch 2 ohms
Maximum Output 23 volts, 8 amps
Distortion (1KHz) 0.2% @ 30 watts, 8 ohms
1% @ 60 watts, 4 ohms
1% @ 60 watts, 2 ohms
Input Impedance 23 Kohm
Damping factor 100
Crosstalk > -80 dB 20-20 KHz
Output Noise 500 uV unweighted
DC offset < 100 mv
Power Consumption 250 watts
Temperature 25 degrees C. above ambient
Dimensions 12 " W x 12" D x 6" H
Shipping Weight 38 lb.
PASS
Pass Laboratories
PO Box 219
24449 Foresthil Rd.
Foresthill CA 95631
tel (916) 367 3690
fax (916) 367 2193

I have built enough Alephs, so I know this cold.

LIGUY

You are very knowledgeable on this stuff, so perhaps you can answer my question:

Just about every SINGLE-ENDED amp on the planet - including most of the FIRST WATT models - drop power into lower impedances.

This was very true of my 30w FIRST WATT J2, which was down to 12w into 4 Ohms.  This is the reason I eventually sold the gorgeous J2.

So how is it that the little ALEPH 30 can produce 30w into 8 Ohms and 40w into 4 Ohms?

What gives?

Sondeknz

I believe the answer to your question about power into speaker impedance is in circuit topology. Voltage gain stages vs. current gain stages. I don’t have simple details at hand since this information comes from reading lots of articles over the years.
Interviews with Nelson Pass about his circuits are plentiful on the Web and Mr. Pass speaks about things in a fairly straight forward and easy to understand way. I find them both interesting and informative. You may, as well.

The answer is that the J2 is a single ended amp with a single JFET output being operated in common source mode from an active current source. That mode of operation gives you both current and voltage gain. Driving a lower impedance causes a drop in the voltage because there's a rise in current output. It's an amp particularly sensitive to how the speaker loads the output devices.