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Old 13th September 2012, 02:10 PM   #1771
sonnya is offline sonnya  Denmark
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Why is it to much gain???
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Old 13th September 2012, 02:12 PM   #1772
Zen Mod is offline Zen Mod  Serbia
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go back and read what lhquam wrote about OLG amount

whatever Rs value you choose ( so amount of OLG ) , with 1:10 xformer that goes by factor 10

to keep amp in normal gain range (say 1V5 for full out ) , amount of feedback must rise , for my liking too much
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Old 13th September 2012, 02:25 PM   #1773
lhquam is offline lhquam  United States
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I was looking for a low part count approach. Perhaps batteries are the solution for that.

Quote:
Originally Posted by buzzforb View Post
Why dual TL over single(like f4/ba2 output). Better control. Perhaps stupid question. Why would TL outperform ccs loaded LED?
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Old 13th September 2012, 02:31 PM   #1774
Zen Mod is offline Zen Mod  Serbia
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what's wrong with plenty of parts ........ just look at my Lightning version - 18 LEDs per channel

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Old 13th September 2012, 02:45 PM   #1775
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Quote:
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Why is it to much gain???
Perhaps different design goals, but Nelson seems to try to get away with as little gain and feedback as possible. I believe using the semi south in one amp, he stated that with the added linearity achieved from the part, he reduced gain and feedback giving back some of the performance gains as a result. He truly believes in as simple and minimalistic as possible, but no less.
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Old 13th September 2012, 03:02 PM   #1776
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Quote:
Originally Posted by Zen Mod View Post
what's wrong with plenty of parts ........ just look at my Lightning version - 18 LEDs per channel

please direct me to the Lightning version. Thank you.
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Old 13th September 2012, 03:04 PM   #1777
Zen Mod is offline Zen Mod  Serbia
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schematic posted by me - hand drawn - few pages back
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Old 13th September 2012, 03:54 PM   #1778
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Quote:
Originally Posted by Zen Mod View Post
pulse xformer is certainly not adequate
those are for switching duties
Why are SMPS transformer ferrite cores like that one about
ferrite core transformer - Detailed info for ferrite core transformer,ferrite core transformer,ferrite core transformer,EE/EI on Alibaba.com
are not suited for linear audio driver transformer?

Which special core requirements are necessary for best results in an application like the F6?

Concerning output transformers in tube amps there are several design rules like follow:
http://www.geofex.com/article_folder...es/xformer.htm

But the idle current values so as peak current values in transformers for fit power output stages are much more lower.

Last edited by tiefbassuebertr; 13th September 2012 at 03:59 PM.
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Old 13th September 2012, 03:57 PM   #1779
Zen Mod is offline Zen Mod  Serbia
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BudP is a guy to tell that
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Old 13th September 2012, 04:27 PM   #1780
lhquam is offline lhquam  United States
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Quote:
TL will not outperform LED,diode or zenner based bias net
You appear to be correct about that. Here is a Spice simulation of the two. The plot shows the ripple rejection of the two approaches. As you can see, the LED+CCS has a much lower corner frequency than the TL and is about 16dB better at frequencies about 100Hz.

Quote:
Originally Posted by Zen Mod View Post
dual vs. single because you need two bias nets

TL will not outperform LED,diode or zenner based bias net

in fact , appropriate tempco will win stability wise but soundwise there will not be difference
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