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FS: First One M v1.4 power amplifier module
FS: First One M v1.4 power amplifier module
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Old 22nd February 2016, 01:08 AM   #1
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow FS: First One M v1.4 power amplifier module

First One M v1.4 amplifier is plug & play Class AB module, current feedback type, ready made to the last detail, calibrated and tested.

Technical specifications:

Maximal power (20 Hz - 20 kHz, THD 0,1 %)
160 Wrms/8 Ohm
250 Wrms/4 Ohm

Maximal power (20 Hz - 20 kHz, THD 0,05 %)
150 Wrms/8 Ohm
230 Wrms/4 Ohm

THD (100 Wrms/4 Ohm, 10 kHz)
0,004 %

THD (100 Wrms/4 Ohm, 100 Hz)
0,0034 %

IMD (80 Vpp/4 Ohm, 19+20 kHz)
0,003 %

THD (1 Wrms/8 Ohm, 1 kHz)
< 0,0016 %

Frequency response (-3 dB)
DC - 1 MHz

Slew-rate
240 V/us

Signal to noise ratio
> -110 dB

Voltage gain
+27,5 dB

Input impedance
10 kOhm

Output impedance (20 Hz - 20 kHz)
< 10 mOhm

Damping factor (100 Wrms/4 Ohm, 20 kHz)
> 2000, measured on PCB output terminals

Output DC offset
< +/-10 mV

Supply voltage
+/-40 V to +/-63 V

Size - dimensions (W x D x H)
100 x 50 x 40 mm

First One Medium module price: 110,00 EUR


Orders & Support welcome:

First One Shop

esl@siol.net


First One User Manual .
Attached Images
File Type: jpg image.jpg (619.1 KB, 3575 views)

Last edited by Lazy Cat; 30th January 2017 at 11:43 AM.
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Old 28th February 2016, 03:44 PM   #2
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow This amp is Phenomenal!

Quote:
Originally Posted by redjr View Post
I put the FO amp into temporary service this morning in my listening room. All I can say is WOW! I thought my last amp (LM4780) added a great sense of dimension, clarity and space to the music. Well, I would be wrong. This amp is absolutely one the best DIY amps I've heard and moves to the top spot so far. I'm warming it up as I write this using my goto all acoustic instruments CD and they sound as if they were all onstage at the end of my room. It's that good. The strings are reproduced with fullness and clarity and the highs are effortless and smooth. Vocals are equally clear and simply pour out of the full sound-stage. And there's plenty of solid and faithfully reproduced bass as well. Actually I'm surprised with how solid the punch of bass is when it is called upon to be reproduced. And I don't have a sub-woofer hooked up to this particular rig.

Attached are pics of the wiring I finished up. It's not totally done yet, as the front panel needs a switch and other custom milling for meters. I'm using it with an Onkyo C-7030 CD player, DIY Doug Self 2012 preamp, and Energy, Reference Connoisseur RC-30 speakers. Sounds marvelous. Even at moderate listening levels the heatsinks are barely warm. A tad warmer around the output devices. Oh, did I say this amp - right out of the box - is super quiet and I simply hear no hum. No tinkering needed here folks - unless of course you want to. There's not much to improve on!

Thanks LC for an exciting new amp. You've given the DIY community an amp module that is affordable and sonic qualities that are unmatched. All you need to add is a PSU and a few hookup wires and you've got one fantastic sounding amp. More listening later today.

Rick
Link to the original post here.
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Old 29th February 2016, 08:39 PM   #3
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow New heart in old body

Quote:
Originally Posted by dd16 View Post
Hello all,

here is example how to put new heart into old body (sorry for bad picture quality). I know, it can make better, but this is good enough for me. Important is sound. Now I have true natural sound. All what is on compact disc come thru TA-E9000ES, FO 1.4 and Altec Lansing fiften into my ears. No more need to go to the opera or another concert. Thanks Andrej.

dd
Link to the original post here.
Attached Images
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File Type: jpg 4.JPG (610.6 KB, 670 views)
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Old 2nd March 2016, 07:01 PM   #4
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by maxlorenz View Post
Listening sessions began...this amp is like putting immense super-headphones! That detailed and textured it is! After listening Bartok's Violin concerto I can say: strings attacks and pizzicatti are lovely; drums attacks are fast and punchy ( You feel the leather being kicked); soundstage is huge, beyond speakers; bass is very deep but better, the images produced by the bass emitting instruments are proportionate to them; voices are fleshy...
VSSA is good but F.O. is on another league.

Thank you again, Master
Link to the original post here,
Attached Images
File Type: jpg FO1.4.2.jpg (949.5 KB, 689 views)
File Type: jpg FO1.4.1.jpg (834.8 KB, 568 views)
File Type: jpg FO1.4.3.jpg (919.8 KB, 604 views)
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Old 5th March 2016, 11:02 PM   #5
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow taccodude's First One experience

Quote:
Originally Posted by taccodude View Post
So , I have been listening to the New FO for a while now and I have to say that for me it`s definitiv a Keeper .It is good with all Kinds of Musik and the Bass that was missing on 1.2 is very good now. The Sound is clean,detailed and dynamic .Last Night I took it to a Friend who wanted to check it out and he was really pleased. We listend to Kodo, Misa Criola, Zaz,Billy Cobham,Chris Rea and some more , it was a long Night. He got some old B+W802 Speakers which can handle some Power and FO was enough for them.
One Problem for me is, when things get better ,I start listening louder all of the Time ,so think twice if Your Wife can handle that.
Happy listening DT
Link to the original post here.
Attached Images
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File Type: jpg DSC07868.JPG (960.0 KB, 340 views)
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Old 28th March 2016, 09:26 PM   #6
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow My FO v1.4

Quote:
Originally Posted by bvtrinh View Post
Hello, here is my iteration of the 1.4. It uses two 550va EI transformers and is dual mono. I'm a relative newbie but the highs are clear and detailed. I can hear snapping where it used to be very faint. The mids are full and smooth and the bass is tight and impactful. It's been completed for two weeks now and I just wanted to let it break in. It is a very good amplifier considering everything cost me les than 500 dollars!
Link to the original post here.
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Old 1st April 2016, 12:36 AM   #7
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow I finished my FO Amp - Still Very Impressed!!!

Quote:
Originally Posted by redjr View Post
Well after a few more weeks I finally put the finishing touches on my FO amp. I added a speaker protection board and some eye-candy meters and a custom milled front panel. Still sounding impressive with a natural and transparent sound. You can hear every note executed with precision and clarity. This amp probably needs more break-in, but it's not fatiguing to listen to at all - regardless of genre. Sitting on top is my Doug Self 2012 preamp build I completed a few years back. It's a great match for the FO.

For those just joining the FO party, a few inside pics can be seen in my post here.

Rick
Link to the original post here.
Attached Images
File Type: jpg P1120414.jpg (377.3 KB, 425 views)
File Type: jpg P1120418.jpg (366.8 KB, 456 views)
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Old 14th April 2016, 10:08 PM   #8
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow FO worth every penny

Quote:
Originally Posted by maxidcx View Post
Hi there,
here we go, FO 1.4 is in situ in the living room and connected (biwiring) to a pair of great (but not officialy in the "hifi" range) JBL LS80 (3.5 way with 2 x8") for 3 hours ago now

what to say ... despite the nice spring wether outside, I m just stuck in the sofa. you know this feeling if you do DIY for some year : one day you plug a new component and all of the sudent, it rocks ! you cant stop putting all your CDs and you feet seems to have a direct cabling with the woofer . you see what I mean.

Well the firstone experience is even beter than that. in addition to that your body feel very proud and you smile for some minutes with a feeling of "yeess, I got it".

Yeah the firstone is just amaizing. Deep and very clear bass, no any noise whatsoever, so clear but not bright. very very good. you feel that music is just natural as it should be.

So good I m now hesitating to build a second one for biamping, as this is already amaizing good in stereo with a single hypex ! the only drawback of my config (2Ux300mm) is that temperature stabilize at 57°C and rises to 59°C at relatively loud level...

Thanks LC for sharing with us a great invention. the FO worth every penny
Link to the original post here.
Attached Images
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File Type: jpg firstone9.jpg (166.7 KB, 532 views)
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Old 19th April 2016, 09:16 PM   #9
Lazy Cat is offline Lazy Cat  Slovenia
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Arrow Now before me I have no speakers

Quote:
Originally Posted by robodo View Post
Hi, I greet all,
I would like also add to the lucky owners of this great amplifier.
I finished building my FO 1.4. I used all-aluminum chassis 2U 300mm, that it fits perfectly.
The temperature on the radiator near the FO module ranges from 40 to 45 ° C, it is great.

Two SMPS power supply (+/-55V) are from Cresnet (thanks Sami).

Everything works perfectly. Now I just listen to music and I'm happy

Now before me I have no speakers, but singers and instruments

Thanks LC

Robert
Link to the original post here.
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Old 24th May 2016, 06:31 PM   #10
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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FS: First One M v1.4 power amplifier module
20160524_201234.jpg Just waiting for a new switch for the front. It is ready to go.
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