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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 27th September 2018, 06:02 PM   #5181
gasgeek is offline gasgeek  United States
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Its interesting that it looks similar to the Balanced Zen Line Stage with the addition of a mosfet current source
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Old 27th September 2018, 06:11 PM   #5182
Hikari1 is offline Hikari1  United States
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Not sure about that.

Front end is F5 with cascoded jfets and BJTs on front end output. Output stage is F4-like.
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Old 27th September 2018, 06:14 PM   #5183
Hikari1 is offline Hikari1  United States
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Also, EVUL had a balanced preamp for his balanced F5 project...check the threads.

Also there is a Balanced BA-3 thread you can use the front end of.
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Old 27th September 2018, 06:21 PM   #5184
gasgeek is offline gasgeek  United States
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Thanks
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Old 28th September 2018, 04:24 AM   #5185
6L6 is online now 6L6  United States
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F5 Turbo Builders Thread
Quote:
Originally Posted by gasgeek View Post
Anyone, I built a pair of balanced F5 turbo's now I'm ready for a balanced preamp project to match. Any suggestions?
Yes. This Sunday at Burning Amp '18 Wayne Colburn is presenting a really cool discrete opamp that can be doubled up for balanced.

Hang tight for a few more days.
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Old 18th October 2018, 11:20 AM   #5186
paulmarinis is offline paulmarinis  Greece
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Hi, im getting ready to build the F5T, and need to buy the resistors now.
are there any preferred brands or technologies?
also im geussing some resistors are more critical then others, what would be the most critical ones?
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Old 18th October 2018, 11:47 AM   #5187
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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F5 Turbo Builders Thread
Based on my listening experience with this Amp I would go for Takman Carbon. I made a mix and IT was not the right mix.

For the 0.47 resistors You Will need something Else.

Last edited by Erlend Sæterdal; 18th October 2018 at 11:50 AM.
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Old 18th October 2018, 04:04 PM   #5188
johnhenryharris is offline johnhenryharris  United States
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I prefer to use MOX or Non-inductive Wire wound resistors for emitter/drain in 3 to 5 watt, Quality matters but I don't go for exotics as the active components add the most distortions, passives (resistors) the least.
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Old 19th October 2018, 09:41 AM   #5189
paulmarinis is offline paulmarinis  Greece
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okz , thanks for the answers
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Old 22nd October 2018, 11:35 PM   #5190
BigE is offline BigE  Canada
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I am going to resurrect my blown F5T. Don't ask how. It is embarrasing.

Anyway, for this build, I will be removing 1/2 of the output devices, and going to two pairs of outputs per channel, biased into a 4 ohm load.

In the original build I used the DIYaudio store boards and a toroidal power transformer with 5 center tapped secondaries.

I used only 4 secondaries to created a sort of "dual mono" F5T V3 in a single enclosure. If memory serves, 48 volt rails.

I have a couple of questions:

Since I have a free secondary, it occurred to me..... can I use that to power the input boards for both channels?

I used one diode bridge ground decoupler per channel ( That thing on the Primary side of the transformer ).. How many should I actually use?

Will I need a third for the input board supply? or should I only have used one in the first place?

Any help would be greatly appreciated.

THANKS IN ADVANCE!
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