Anybody here got an itch to build a FirstWatt F5 amp?

[GECO]

EISH dude

will see what I can find.

[fdlsys]

Rudi, if you can get genuine 170/74BL, I would take 4 sets, for starters

[GECO]

I suggest that somebody order some. 

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=sk170bl+pair&_sacat=See-All-Categories

free shipping

[Prince]

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?

[fdlsys]

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.

[GECO]

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.

[Spuds]

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

I'm also in for a few pairs.

[Prince]

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. 

-back to the drawing board!!

 

[WaterHond]

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...

[Prince]

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. 

-back to the drawing board!!

 

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

[Heinrich]

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

Turn the probes around.

[Prince]

Turn the probes around.

-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!

 

[Prince]

-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!

 

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

[Heinrich]

-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.

[Prince]

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...