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F5Turbo Illustrated Build Guide
F5Turbo Illustrated Build Guide
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Old 24th September 2018, 08:26 PM   #471
6L6 is offline 6L6  United States
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F5Turbo Illustrated Build Guide
Long story short, with 34v rails the schematic values of

R25, R26 - 10k

R27, R28 - 4.75k

are perfect.
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Old 24th September 2018, 10:19 PM   #472
esprit is offline esprit  Europe
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Many Thanks

Get it !!
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Old 30th September 2018, 06:15 PM   #473
johnpark0 is offline johnpark0
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Hi, noob here. Could someone explain what has been done with the terminal block with the leads coming from the transformer? Looks like there are some resistors or caps that have been soldered in but I can find no mention of them in the BOM or on the PSU BOM or instructions.

Thanks,

John
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Old 10th February 2019, 05:18 PM   #474
Blitz is offline Blitz  Germany
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Quote:
Originally Posted by 6L6 View Post
The gatestoppers work essentially like a shock absorber at high frequency (way above audio) and damp the Mosfet from oscillation. The F5T is a pretty darn high bandwidth design and depending on a ton of variables it can oscillate. Higher value gatestoppers help damp that tendency.

BUT, if your amp works, don't worry about it. If it was going to break out in oscillation it would already have done it and you'd know because your Mosfet would be fried.
6L6,

May I ask if anyone has tested ferrite beards instead of resistors as gate stoppers like this one https://www.tme.eu/de/Document/2c95f...92acce0/fr.pdf
, so 1000 ohm at 25MHz...

I tried this in my tube gear (but with not so critical tubes) and It was giving me a nice upgrade, clearer, more dynamic...its basically a piece of copper wire...

Is this feasable to usein the F5T as well ?
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Old 10th February 2019, 06:44 PM   #475
6L6 is offline 6L6  United States
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I don’t know if anybody has done that with mosfets. I’ve only heard that done with tubes.

It would be simple to try.
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Old 11th February 2019, 12:20 AM   #476
Blitz is offline Blitz  Germany
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Happy to do so...what will happen of this thing starts to oscillate ? Smoke ? How do you know ?
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Old 11th February 2019, 12:53 AM   #477
6L6 is offline 6L6  United States
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If it oscillates all the mosfet will die and the amp won’t work anymore.
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