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Old 14th December 2018, 04:49 PM   #15951
Kosst Amojan is offline Kosst Amojan  United States
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My Antek tranny hums audibly, as in physically inside the chassis. It's just about as loud through the speaker. Not that it's very loud though. At 12 feet away I can't hear it, but walking past the system I hear a slight him in the speakers, but also from the amp itself.
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Old 14th December 2018, 06:45 PM   #15952
Nelson Pass is offline Nelson Pass  United States
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Unusual for Antek to have a fault. Consider that there might be some other
issue related to voltage and current and/or rectification.
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Old 14th December 2018, 06:49 PM   #15953
cviller is offline cviller  Canada
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Quote:
Originally Posted by Kosst Amojan View Post
My Antek tranny hums audibly, as in physically inside the chassis. It's just about as loud through the speaker. Not that it's very loud though. At 12 feet away I can't hear it, but walking past the system I hear a slight him in the speakers, but also from the amp itself.
The mechanical hum from transformers should not get into your signal path as hum - depending on what amp you are talking about, there might be something you can do to get rid of the noise. I have built a lot of first watt clones and the push pull ones have been very quiet compared to the aleph style. If you have significant hum in a F5 build, it would be worth investigating.
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Old 14th December 2018, 07:32 PM   #15954
indra1 is offline indra1  Indonesia
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Quote:
Originally Posted by Kosst Amojan View Post
My Antek tranny hums audibly, as in physically inside the chassis. ...
Probably your Mains supply have some DC component, you can try some DC stopper.
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Old 14th December 2018, 08:05 PM   #15955
Kosst Amojan is offline Kosst Amojan  United States
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Quote:
Originally Posted by indra1 View Post
Probably your Mains supply have some DC component, you can try some DC stopper.
It's real quiet. I doubt I could measure it above background noise. My refrigerator running in the kitchen will drwn it out.
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Old 14th December 2018, 08:23 PM   #15956
JeffYoung is offline JeffYoung  Ireland
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Quote:
Originally Posted by jphabc54 View Post
... my main amp is a Rogue Cronus Magnum II.
Ha! Same amp I have.
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Old 16th December 2018, 04:46 PM   #15957
ichiban is offline ichiban  United States
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Quote:
Originally Posted by Kosst Amojan View Post
It's real quiet. I doubt I could measure it above background noise. My refrigerator running in the kitchen will drwn it out.

Our Kitch-en-Aid refrigerator sounded like a truck idling. Drove me nuts. Wasn't that old. Replaced it with an LG with a linear compressor, Consumer Reports chart showed it as the quietest . The bottom under the pull out freezer drawer built up an inch thick ice block because the drain hole froze over and the defrost cycle water built up. Youtube has a vid on how to modify the heating coil to keep the drain hole ice free. Has been good ever since.
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Last edited by ichiban; 16th December 2018 at 04:48 PM. Reason: add
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Old 18th January 2019, 06:44 PM   #15958
dezibaby is offline dezibaby  Germany
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Hello Daddy Pass,

hello dear Diy community

F5, B1 and Pearl Two I finished, I'm still excited about the sound and I want to imitate a turbo v3 but only half.

Without Q9, Q10, Q11, Q12 with 24V power supply. So I want to compensate for missing gain in B1 but equal to achieve good playback as F5 original. And for proven stability of the schemes this should also be involved.
Am I right about thinking here?

Has the topic been discussed?
then I need a link for that


Thanks together!

Dezibaby.
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Old 18th January 2019, 07:34 PM   #15959
6L6 is online now 6L6  United States
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F5 power amplifier
F5Tv1 or v2.

I suggest v2

Read the F5Turbo article by Nelson;

http://www.firstwatt.com/pdf/art_f5_turbo.pdf

F5Turbo Illustrated Build Guide

Click the image to open in full size.
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Old 18th January 2019, 08:05 PM   #15960
dezibaby is offline dezibaby  Germany
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hello 6L6,

on F5Tv3, I assumed that Q7 and Q8 could compensate for lack of gain in B1. My thoughts are that control voltage is too low for the power transistors, which can do more in all the same conditions.

And v3 with eight power transistors is the power consumption too expensive for me, also my transformer is "only" 1kW.
Because of consumption I stay at 24V supply.

That's why this "abbreviated" version of v3.
Sorry for English, I use Google.

Thank you very much.
Dezibaby.
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