Fairchild interest alternatives

[jacco vermeulen]

I did too, 15 years ago. (+J200/K1529)

[studeb]

i think the best is to try the 16n25 compare it with the "real deal" and see if you can tell them apart by ear or otherwise.
Could the oscillating "fakes" be tamed, they could have been rejects

[fdlsys]

Buzz, I don't think we can thank you enough - you are going waaaay out of your way to organise this.

As far as my opinion on this vs. that - I really have no clue.
FQA16n25C certainly looks like the most likely replacement, but due to my utter lack of necessary knowledge on the subject, I will have to depend on the others to set the direction.

EDIT: Oh, forgot - you should add the FQA16n25C to the poll options...

[buzzforb]

I accidentally ytped 12n25C. It is upposed to be 16n25c.

I will pick on BKsabath to make a point. He used the FQP19n20 devices in his F5, paired with FQA12p20. THe FQP is a smaller but identical version of its large FQA brother. IT has slightly lower numbers, probably a result of smaller die size as well as its thermal characteristics. THis is not the device used by Papa as stated in this thread.

Fqa12p20 Fqa19n20c Discontinuation

All that being said, He loves his amp. If you compare his part, the orignal part, and the 16n25c, you see that the 16n is actually a closer match to the orginal. What that tells us is that the choice, if close to original specs, is probably going to sound great. I will try to publish as much info as I can on the new devices, but barring Nelson rushing in and saying these parts suck, I don t expect a great difference based on what I see in the datasheet. Keep in mind, that you have the great equalizer in P3. THis uses the FE to compnesate for the diffences in the output. Brilliant, right. BTW, I like the BA# better than the F5 and plan to put the diodes in a BA3T

[Rush]

Originally Posted by buzzforb

I accidentally ytped 12n25C. It is upposed to be 16n25c.

I will pick on BKsabath to make a point. He used the FQP19n20 devices in his F5, paired with FQA12p20. THe FQP is a smaller but identical version of its large FQA brother. IT has slightly lower numbers, probably a result of smaller die size as well as its thermal characteristics. THis is not the device used by Papa as stated in this thread.

Fqa12p20 Fqa19n20c Discontinuation

All that being said, He loves his amp. If you compare his part, the orignal part, and the 16n25c, you see that the 16n is actually a closer match to the orginal. What that tells us is that the choice, if close to original specs, is probably going to sound great. I will try to publish as much info as I can on the new devices, but barring Nelson rushing in and saying these parts suck, I don t expect a great difference based on what I see in the datasheet. Keep in mind, that you have the great equalizer in P3. THis uses the FE to compnesate for the diffences in the output. Brilliant, right. BTW, I like the BA# better than the F5 and plan to put the diodes in a BA3T

Any idea what the prices will be for the a pair of 16N25C/12P20?

[buzzforb]

The same cost, so same price range as before. The only reason it would be higher is because of poor matching.

[buzzforb]

Anybody have f5t boards and want to beta test. I have 100 pairs on the way. I have a set of boards on the way.

[boywonder]

Thanks Buzz for all of your effort!

I'm OK with whatever the group decides, as I'm rather new to the mosfet stuff. I have a small stash of IRF parts to play with in the meantime....after I finish a trioded 45 TubelabSE project.

[buzzforb]

Oh, that sounds very nice. Just got done with 6V6 trioded preamp.

[ARGOS]

The 16n25c looks like a very reasonable alternative.

--Michael