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Old 20th April 2013, 05:13 AM   #1
tony Ma is offline tony Ma  United States
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Default Best Pass LAB Power AMP - Opinion

Dear All,

I am still newbee in this arena, so pls forgive me if I started fire ...

I am done with all my tube Sound System and looking more hybrid

What is the best Amp for Pass Lab to built in term of

1. Value (cost)
2. Sound (I knew this may be depend on room/speaker etc, but just say in general)

I dunno where to start. Maybe for me

This is to power Jim Holtz statement Speaker

But maybe in the future to drive other different speaker

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Old 20th April 2013, 05:38 AM   #2
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Search forums on "Mauro myref".
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Old 20th April 2013, 12:33 PM   #3
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I think you want to give the Statements more power than Papa's amps typically produce.

No point in buiding an expensive amp and expensive speaker and not being able to get the most from the combo.
I was so much older then, I'm younger than that now.
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Old 18th November 2013, 03:42 PM   #4
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In broad terms I think it's safe to say (Broad terms!) it's a toss up between the AlephJ and the F5. With the Aleph J being likened to. "Tube sound"

I have the F5 and it's an awesome Amp, the best I've ever owned.

I plan to build the Aleph sometime soonish also, why not

Before then, very soonish, I will be putting together the Juma pre amp design. Just a heads up If your wondering about the sensitivity of your speakers or you have a need to rattle windows sometimes, it is said to be a fantastic marriage.
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Old 18th November 2013, 04:26 PM   #5
OllBoll is offline OllBoll  Sweden
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If you have built a single FW-amp then to redesign it into another one is very cheap since the major costs are the enclosure with heat sinks and the PSU.

There is a big camp that likes the softer sound of 2nd order harmonics amps like the Alephs, F2.

There are some who like 3rd dominant amps like the F5.

Some want something in between where they can change the character like the PLH or the F6.

All types have several versions, Nelson has a nice table on FIRST WATT PRODUCTS where he states if they are single ended, balanced, push-pull and what is special about each amp.
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Old 18th November 2013, 04:30 PM   #6
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This is to power Jim Holtz statement Speaker
This is mid 80's effeciency? 85-87db?

F6 is 30w Class A. (Requires a power Jfet that's hard to get today.)
F5T v2 is 50w Class A
F5T v3 is 100w Class A

You can tune the harmonic distortion in these amps to suite your taste.
They are tuned best with a spectrum analyzer (SA). There are simple plans for a SA, search the net or these forums. Just need a PC and a ASIO capable sound card and a few components.

F6 Amplifier

If these intererst you, you have some reading to do.
I build, therefore I am.

Last edited by vdi_nenna; 18th November 2013 at 04:45 PM.
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Old 18th November 2013, 07:57 PM   #7
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For the low impedance, moderately low efficiency statements, consider either a F5X or a pair of F4 monoblocks using a pumpkin preamp to create a balanced amp for each speaker. There are other front end options for the F4, you need something that can swing pretty substantial voltage. An X-BA3 front end would be interesting, too.

An A75 or X100 backengineered here would be decent options as well. I think you'll find most people seem to prefer the more recent jfet front end designs, though.
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Old 19th November 2013, 05:41 PM   #8
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Of course none of these are "Pass Labs" power amps.

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Old 21st November 2013, 03:55 AM   #9
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True, Nelson.

Originally Posted by tony Ma View Post
This is to power Jim Holtz statement Speaker
You want at least rock solid 100 to 150 W into 4 Ohms.

If you really mean "Pass Labs", then X150 & X250 are what you're looking for.

Blaue Leuchtdioden machen blöd. (hb)
sent from NSA monitored device
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Old 21st November 2013, 04:04 AM   #10
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just to add my 2c.

ive heard the full size statements on a aleph-J in a med size room.
it was clean, loud as we wanted, and pure bliss.

i have to say i can recomend that combo as long as you are not looking for earbleeding levels.
I'm not crazy, my mother had me tested
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