Author Topic: Anybody here got an itch to build a FirstWatt F5 amp?  (Read 77966 times)

Offline GECO

  • Commercial Member
  • *****
  • Posts: 6,974
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #975 on: April 14, 2012, 05:50:20 pm »
EISH dude

will see what I can find.

Offline fdlsys

  • Vinylist
  • Trader
  • *****
  • Posts: 5,644
  • Do you like life, sweetheart?
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #976 on: April 14, 2012, 06:46:40 pm »
Rudi, if you can get genuine 170/74BL, I would take 4 sets, for starters ;)
SMOUS: SiMply gorgeOUS
Next Gauteng DIY Audio Show: Tentatively, on 30. April 2016, same place! To be confirmed ...

Offline GECO

  • Commercial Member
  • *****
  • Posts: 6,974

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #978 on: April 14, 2012, 07:52:48 pm »
Rudi, if you can get genuine 170/74BL, I would take 4 sets, for starters ;)

-How about a group buy between you and me fdlsys?

:)
"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline fdlsys

  • Vinylist
  • Trader
  • *****
  • Posts: 5,644
  • Do you like life, sweetheart?
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #979 on: April 14, 2012, 08:16:48 pm »
With pleasure, but finding non-fake part is a bit of mission. Think we'll have to try DIYAudio.com rather. PM me your email and let's what can be done.

Rudi, if not a trade secret - where did you get the first batch from?

That Ebay search brings 0 finds, btw.
SMOUS: SiMply gorgeOUS
Next Gauteng DIY Audio Show: Tentatively, on 30. April 2016, same place! To be confirmed ...

Offline GECO

  • Commercial Member
  • *****
  • Posts: 6,974
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #980 on: April 14, 2012, 08:26:35 pm »
I got it from a guy in Isreal.
but I think you are safe getting from the guy listed. he does have good ratings and would have been caught out by now if he was supplying fakes.

Offline I Shot Tupac!!!

  • AVForums Veteran
  • *****
  • Posts: 4,752
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #981 on: April 15, 2012, 12:32:29 am »
-How about a group buy between you and me fdlsys?

:)

I'm also in for a few pairs.

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #982 on: June 09, 2012, 08:30:28 pm »
So, close and yet so far...

One channel sorted...But, the other giving me a -0.7mv output. Not sure, what to change to get it to the 0.44mv I get on the working channel, because both the MOSFETs are biasing correctly and warming up nicely like a Class A should.  :thinking:

-back to the drawing board!!

 :sulky:
"F5 Amp Power + Pedal Power = F5 Pedal Power"

Online WaterHond

  • AVForums Veteran
  • *****
  • Posts: 5,051
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #983 on: June 09, 2012, 08:36:58 pm »
I got it from a guy in Isreal.
but I think you are safe getting from the guy listed. he does have good ratings and would have been caught out by now if he was supplying fakes.

Must be real then... ;D

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #984 on: June 09, 2012, 09:25:13 pm »
So, close and yet so far...

One channel sorted...But, the other giving me a -0.7mv output. Not sure, what to change to get it to the 0.44mv I get on the working channel, because both the MOSFETs are biasing correctly and warming up nicely like a Class A should.  :thinking:

-back to the drawing board!!

 :sulky:

-Well, I got the output down to 0.44mV, but, voltage still negative....

:(
"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline Heinrich

  • AVForums Veteran
  • *****
  • Posts: 1,314
  • silence is golden, but ductape is silver
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #985 on: June 10, 2012, 07:33:26 pm »
-Well, I got the output down to 0.44mV, but, voltage still negative....

:(
Turn the probes around. :sh1tstirrer:
someone told me that i can make ice cubes with left over wine.
i am confused, what is left over wine?

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #986 on: June 10, 2012, 09:58:15 pm »
Turn the probes around. :sh1tstirrer:

-I can do that, but won't solve the actual polarity problem. And is the 2nd channel supposed to have a negative voltage output?
-Other than above problem she runs sweetly. Will do some music playing testing, if I can solve the polaity issue. I could swop the output terminals to achieve the positive polarity, but not ideal!

 :sulky:
"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #987 on: June 11, 2012, 02:07:31 pm »
-I can do that, but won't solve the actual polarity problem. And is the 2nd channel supposed to have a negative voltage output?
-Other than above problem she runs sweetly. Will do some music playing testing, if I can solve the polaity issue. I could swop the output terminals to achieve the positive polarity, but not ideal!

 :sulky:

-Good news..The diyaudio forum guys said not to worry about the negative output voltage, so the testing will begin tonight!!

:)
"F5 Amp Power + Pedal Power = F5 Pedal Power"

Offline Heinrich

  • AVForums Veteran
  • *****
  • Posts: 1,314
  • silence is golden, but ductape is silver
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #988 on: June 11, 2012, 02:15:19 pm »
-Good news..The diyaudio forum guys said not to worry about the negative output voltage, so the testing will begin tonight!!

:)

well done.

let the F5 ing commence.
also works as a nice heater.
someone told me that i can make ice cubes with left over wine.
i am confused, what is left over wine?

Offline Prince

  • Forum Moderator
  • *****
  • Posts: 2,535
Re: Anybody here got an itch to build a FirstWatt F5 amp?
« Reply #989 on: June 11, 2012, 02:39:53 pm »
well done.

let the F5 ing commence.
also works as a nice heater.

for sure. Bought a multi-meter, that has a temp sensor, so, now I can measure the heatsinks, so see how toasty they get!! Will be interesting to see what they running at...

 O0  :thumbs:
"F5 Amp Power + Pedal Power = F5 Pedal Power"