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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 15th November 2017, 08:22 PM   #4971
laverda is offline laverda  United Kingdom
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Quote:
Originally Posted by JeffYoung View Post
He he... you'll have to post that on the "Why the hate for spades?" thread....
Ah...see where your coming from...

The spades are OK by me used them for decades without issue till now but the 'crimp' type if used got to be good...I recall we had a man come and do a drop test on our cable crimps known as the 9lb drop test...long ago now...power industry
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Old 16th November 2017, 10:46 AM   #4972
Bfpca is offline Bfpca  Canada
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F5 Turbo Builders Thread
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Originally Posted by laverda View Post
Ah...see where your coming from...

The spades are OK by me used them for decades without issue till now but the 'crimp' type if used got to be good...I recall we had a man come and do a drop test on our cable crimps known as the 9lb drop test...long ago now...power industry
I usually solder them after I crimp them. I use an Amphenol crimping tool that does a pretty good job with most sizes of wire and spades. When properly crimped the connection should be gas tight and very low resistance. I've seen this type of connection used in older lab equipment that was in a corrosive (acidic) environment and we never saw any issues with the crimps. They also used Teflon insulated silver coated wire.
Even so, I solder them as well, particularly when they are in vital spots. I think I remember Papa Pass mentioning that he prefers to solder them as well.
So exactly how did a bad connection end up causing the amp to blow up? Have you figured that out?
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Old 29th November 2017, 08:55 PM   #4973
trean27 is offline trean27
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i Have a question about my build of the F5 Turbo v.3 with irfp240 and irfp9240,
I had som issues with hum because of high ripple in psu,
I modified the cascode board with too little Capacitance, and that was the problem, I belive,
but before I got to that conclusion, I built a Regulator for the whole amp and all ripple went away, and hum disapeared, it sounds really good i would say, but my question is, if the
regulator with big 2sc5200 and 2sa1943, will decrease the sound quality details and so on, or just a matter of taste for everybodys own preferance ?
i have 20000uf before each regulator and 68000uf after.
and experience on this. ?
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Old 30th November 2017, 12:11 AM   #4974
Bfpca is offline Bfpca  Canada
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F5 Turbo Builders Thread
Congratulations on getting your F5 T V3 running! I built F5 V3 monoblocks with separate CLC power supplies. I did not use the turbo diodes. I have no hum at all. I am using Jensen input transformers as well, so that I can run single ended or balanced.

Regulated supplies should work fine if the regulators are stable and you can get rid of the heat generated by the series pass transistors. As far as sound goes- it’s all personal preference IMO. If you like it , it’s good!
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Old 14th December 2017, 09:21 AM   #4975
potstip is offline potstip  Turkey
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I have 20VAC so 27.5 DC output. Am i have to change any part from official partlist because of 3-4v over suggested 24 voltage?
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Old 14th December 2017, 09:47 AM   #4976
JeffYoung is offline JeffYoung  Ireland
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F5 Turbo Builders Thread
Quote:
Originally Posted by potstip View Post
I have 20VAC so 27.5 DC output. Am i have to change any part from official partlist because of 3-4v over suggested 24 voltage?
This is the F5 Turbo thread, which assumes 32V rails. It's the normal (non-Turbo) F5 that has 24V rails.

But short answer is: just the PSU caps. (You'll want 35V parts rather than 25V.)

Best to read the F5 Turbo doc here: http://www.firstwatt.com/pdf/art_f5_turbo.pdf

Cheers,
Jeff.
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Old 14th December 2017, 10:37 AM   #4977
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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F5 Turbo Builders Thread
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Originally Posted by Erlend Sæterdal View Post
Why make primitiv design like this? it is Very difficult to get good results from.
Sorry About that.

Now I love the amp.
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Old 16th December 2017, 08:05 PM   #4978
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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F5 Turbo Builders Thread
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Originally Posted by Erlend Sæterdal View Post
Sorry About that.

Now I love the amp.
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Old 19th December 2017, 11:06 AM   #4979
Rixsta is offline Rixsta  United Kingdom
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F5 Turbo Builders Thread
Can anyone tell me why I felt this amp sounded a lot better than the original F5 ? F5 was brilliant and F5 Turbo was simply outstanding.
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Old 19th December 2017, 12:49 PM   #4980
6L6 is offline 6L6  United States
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F5 Turbo Builders Thread
Parallel output devices sound better.
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