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It is currently 09 Aug 2020, 07:22

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PostPosted: 01 May 2020, 23:47 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Hope the SNA member doesn’t mind me putting this up but here is a newly completed F5 turbo with some high end parts. Pretty well every tweak you could include has been. A way over specked double PS makes this a dual mono build.

5U heavy extra thick enclosures with steel sub-chassis. Two 300VA shelled trannies.. 16 X 15A supper fasting diode pairs and 192,000uf of caps snubbed a number of times. . Don’t want to say to much before the member has a chance to hear but very impressed so far.
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PostPosted: 21 May 2020, 07:36 
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Great looking build for those with inefficient speakers. One drawback when you go over a 25 watt class A amplifier is the heat generated.
You will have a small electric heater. Great in the winter time though.

Off the subject Matt but have you listened to your F5 build?


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PostPosted: 21 May 2020, 18:36 
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This one ran high current and the HS reach 50c the FETs 60c. That’s how the owner wanted it. Now building my own. Not a turbo just very standard.
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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 21 May 2020, 18:53 
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The target temp for a FW build according to Nelson is 55C so the amp is running cool but being that you have much larger heatsinks in the turbo because of 50 watts it is going to heat the room much more than a standard 25 watt build. I have a couple of my FW clones with 20V transformers instead of the customary 18V transformers that run 60C without a problem. Many run theirs hotter than that, called fearless amplifier builders. The hotter they run the better they sound. That is until they burn up but the high operating temp of the mosfets in the F5 is 150C so generally it is not a problem to go a little higher. BJT transistors are a different story. The will run away and destroy themselves at a certain temp point.


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PostPosted: 21 May 2020, 18:58 
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wdecho wrote:
The target temp for a FW build according to Nelson is 55C so the amp is running cool but being that you have much larger heatsinks in the turbo because of 50 watts it is going to heat the room much more than a standard 25 watt build. I have a couple of my FW clones with 20V transformers instead of the customary 18V transformers that run 60C without a problem. Many run theirs hotter than that, called fearless amplifier builders. The hotter they run the better they sound. That is until they burn up but the high operating temp of the mosfets in the F5 is 150C so generally it is not a problem to go a little higher. BJT transistors are a different story. The will run away and destroy themselves at a certain temp point.

Good to hear it’s not too hot.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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