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First One - mosfet amplifier module
First One - mosfet amplifier module
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Old 14th July 2018, 06:45 PM   #4261
androa76 is online now androa76  Slovenia
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GND cant be problem. You probabbly pluged jack into active dac and amplifier was also turned on. At jack low impedance output, often big caps are on output. If dc is present on them that dc can damage amplifier. Often jack connect first central active pin not gnd pin. And imput impedance of amp is 20kohm range not 100ohm as by phones. So dc on big caps can*t be discharged so fast. Sorry to hear...
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Old 14th July 2018, 06:59 PM   #4262
adason is offline adason  United States
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rca audio connector is the most idiotic connector there is...its active side is sticking out like penis making connection before the ground does. It's unbelievable they were never replaced with something normal. They are solely resposible for countless amplifiers and speakers.
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Old 14th July 2018, 07:02 PM   #4263
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by hose4 View Post
I have some news.

I have seen and heard new prototypes with 8 transistors per channel and 600 Watts RMS.
2 variants of the last version are in the listening room. Hopefully we will get a locked version soon.

I have heard them on Focal Grande Utopias. They sounded truly amazing.

I hardly wait to get my hands on one.

DIY option will stay.
Thanks for a brief and pleasant report my friend, it's truly like you've described. I'm very exciting about new forthcoming First One modules, after all it's two years of intense R&D involved in it (last FO modules were produced in 2016). For DIY community two power sizes will be available, one with two double-die mosfets and one with four of them. More powerful variants with 6, 8, 12 mosfets will be intended for our ready made amplifiers production and for OEM purposes as well.

Now, these days last tests are taking place to determine which of two variants will go into modules production.

I can assure all of you that these modules will be total high-end fidelity audio amplifiers, best on the market. In 2018 we had a lot of supporting equipment for our R&D purposes like Grande Utopia Focal loudspeakers, Select and Reference MSB DAC, Adagio Metrum DAC, Siegfried Reference monoblock and preamplifier VTL, Reference 10 preamplifier Audio Research and many many more. The aim of having them for comparisons was to be at least on the same SQ level like the ones mentioned.
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Old 14th July 2018, 07:07 PM   #4264
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by J.M.K View Post
Hi !!

I just fried (half working, bad sound, 2 led lights still on) one V1.4M module of my dual-mono amplifier.

I don't think it's worth trying to fix it, or is it ?

What happened: I tried to change the usual feed (cinch/RCA-RCA cables from my preamplifier) to a stereo jack/cinch adaptor from my DAC-headphone output. Unfortunately that type of adaptor has a common ground on the jack plug .......... and I guess that one of the amplifier module didn't like it very much.
Completely my fault !!

I asked for new one from the FB site ............ I have no idea if they're still available.
Unless someone here has a spare one (in good shape) for selling ?
If so, please PM me !

Thanks in advance

JMK

PS: To make my case worse, I usually have an excellent ISO-Max ground loop isolator between my preamp and my amplifier (in order to electrically separate them completely), and I bypassed it for my stupid test ............
No excuse for me !
Please don't worry, to all who had problems with First One M or L modules new replacement modules will be offered, for some free of charge, for others at lower rate exchange prices. I'll handle individual cases and see what's best solution for both sides.
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Old 14th July 2018, 08:30 PM   #4265
J.M.K is offline J.M.K  France
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Quote:
Originally Posted by androa76 View Post
GND cant be problem. You probabbly pluged jack into active dac and amplifier was also turned on. At jack low impedance output, often big caps are on output. If dc is present on them that dc can damage amplifier. Often jack connect first central active pin not gnd pin. And imput impedance of amp is 20kohm range not 100ohm as by phones. So dc on big caps can*t be discharged so fast. Sorry to hear...
I guess this is exactly what happened ........ Plus I bypassed my isolator.
I usually put my amplifier off before doing that sort of test, but I didn't that time for an other stupid reason.

Anyway ........... I'm glad to hear that replacement modules will be available.
May I ask when ? just to have an idea .......... 1 month, 2 months ?

This is the best power amplifier I ever had (sound quality wise).

Thanks anyway

JMK
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Old 15th July 2018, 09:23 AM   #4266
Bassivus is offline Bassivus  Serbia
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Location: Novi Sad, Vojvodina
Quote:
Originally Posted by adason View Post
rca audio connector is the most idiotic connector there is...its active side is sticking out like penis making connection before the ground does. It's unbelievable they were never replaced with something normal. They are solely resposible for countless amplifiers and speakers.
Actually there is one smart alternative made by Neutrik Profi Cable Connectors - Neutrik It's patented mechanism make gnd surrounding stick out before it connects...
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Old 15th July 2018, 09:57 AM   #4267
AndriyOL is offline AndriyOL  Ukraine
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Quote:
Originally Posted by adason View Post
rca audio connector is the most idiotic connector there is...its active side is sticking out like penis making connection before the ground does. It's unbelievable they were never replaced with something normal. They are solely resposible for countless amplifiers and speakers.
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