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Old 29th September 2012, 01:31 AM   #511
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Quote:
Originally Posted by evanc View Post
Kofi,
Post 53 by Jumna in the thread preamp ideas for f5 is tiny simple and sounds good to my ears. I have a preamp that uses his circuit for a couple of inputs and uses a DCB1 for the others so I have choices.....
Evan

Juma not jumna
Thanks! This looks perfect.

Quote:
Originally Posted by jacco vermeulen View Post
Common, Kofi has people to look for him, he never learned how to do that himself.
Have you seen my keys?

Kofi

P.S. Seriously, I can't find my keys. Please help.
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Old 29th September 2012, 01:36 AM   #512
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Quote:
Originally Posted by Kofi Annan View Post
Thanks! This looks perfect.



Have you seen my keys?

Kofi

P.S. Seriously, I can't find my keys. Please help.
on the other hand. i just tonight maxed out my aleph P1.7 with 10db gain on my F5 and was stil missing alot. damn those low level downloads

have to ad one thing. it was not close to cliping. even with a good level recording.

you will hear that a good CD player or DAC can put out 2V. yes it CAN. but the recording WILL hold back.
in the real world, you will see about 0.32V avrage.. or 0.5V if you are lucky. nothing near 2V rms.

Last edited by AudioSan; 29th September 2012 at 01:46 AM.
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Old 29th September 2012, 02:02 AM   #513
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another solution is a F5 mini. running on +/-15V and 0.8A bias. with a J-fet boz preamp.
that will give you alot of good sound for a smal amount of power.
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Old 29th September 2012, 02:21 AM   #514
6L6 is offline 6L6  United States
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Change R5 R6 R7 R8 to 150 or 220 ohm. You will get more gain, at the expense of a bit of feedback. I built one F5 stock, one with 150ohm resistors, and they sound identical, but the one with 150R is noticeably more sensitive. People who have build them with 220R report wonderful sound and the ability to clip it with a CD player.
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Old 29th September 2012, 12:55 PM   #515
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yes that is a solution raise the gain to about 22-23db
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Old 29th September 2012, 05:47 PM   #516
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Outstanding "How To"
Makes me want to build an amp. Im not at that level though.
Good Job.
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Old 29th September 2012, 09:16 PM   #517
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Go on! F5 is a piece of cake.
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Old 8th October 2012, 02:01 AM   #518
KWS1 is offline KWS1  United States
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I built a new board as the other was mangeled from being pulled in and out oft he enclosure. All the voltages seem to check out, however I am still unable to draw current through R11 &12. I am not sure what to do from here.....
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Old 8th October 2012, 07:16 PM   #519
Itsmee is offline Itsmee  England
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What is the gate - source voltage of Q3 & Q4?
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Old 8th October 2012, 07:49 PM   #520
KWS1 is offline KWS1  United States
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24.75 volts...
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