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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 20th June 2018, 04:50 AM   #5171
Hikari1 is offline Hikari1  United States
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So...I replaced the jfets with another batch. Offset is 0mv when inputs shorted and 50mv when not shorted. Is this acceptable and normal?
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Old 20th June 2018, 04:52 AM   #5172
6L6 is offline 6L6  United States
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F5 Turbo Builders Thread
Yes.
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Old 26th September 2018, 12:46 PM   #5173
VonLoon is offline VonLoon
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Default balanced input?

So first off thanks to all you dedicated members who have kept this community going for lurkers like me. I'm having trouble finding information that has certainly been discussed. I have a a 'fully balanced' DAC and preamp, going single ending means either using only half the digital hardware or adding a device to sum the signal.

What i really want a proper balanced input, is this feasible with F5T as 50W stereo (not 2 kit mono block) I know ba-1 and m2x are also options, also could start with an SE amp and change it up latter, same chassis and much of the same PS.

I'm still in the research and soldering practice phase, but i feel i need to buy before boards or matched fets run out.
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Old 27th September 2018, 09:21 AM   #5174
VonLoon is offline VonLoon
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huh, cant add to old posts.

I'm pretty bad at reading schematics, but it seams like using this front end balanced should be as easy as connecting the 'extra' input to link. q1 and q2 feel the voltage difference between input and link through r3 or r4.

If I got this right I'm probably just going by the boards and go for it. Last amp project was and Altoids tin ear bud amp a few years back. Picked up an old CRT tv from by a dumpster and removed then re-soldered most of the input board for practice. Feeling pretty good.
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Old 27th September 2018, 09:55 AM   #5175
Zen Mod is online now Zen Mod  Serbia
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F5 Turbo Builders Thread
try illustrating that with schematic

I'm not following you this way
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Old 27th September 2018, 10:29 AM   #5176
VonLoon is offline VonLoon
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In L6L's build guide he mentions that the link hole was useful for balanced builds but everyone else must connect it to the neighboring ground through hole. I'm wondering if anyone has published proper use of this 'link', I wasn't sure if it was for accepting a balanced input or connecting to a balanced output stage.

F5Turbo Illustrated Build Guide

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Old 27th September 2018, 11:07 AM   #5177
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nope , that remark is for possible bridging of two F5 channels , for establishment of SUSY operation

you can't connect balanced signal to regular F5 channel , without resorting to using some external gizmo - either xformer of active circuit
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Old 27th September 2018, 05:24 PM   #5178
gasgeek is offline gasgeek  United States
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Anyone, I built a pair of balanced F5 turbo's now I'm ready for a balanced preamp project to match. Any suggestions?
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Old 27th September 2018, 05:33 PM   #5179
gasgeek is offline gasgeek  United States
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hmm.. I just realized that I have in my possession a X2 service manual schematic. maybe i will go that way.
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Old 27th September 2018, 05:46 PM   #5180
Hikari1 is offline Hikari1  United States
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UGS-UP-Mini: A 25W SUSY Amp

Use just the front end.
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