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Autor Thema: Vorstellung 5Ä3  (Gelesen 9518 mal)

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Offline Achtpanther

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Re: Vorstellung 5Ä3
« Antwort #135 am: 29.09.2017 08:56 »
if it works and you are looking for a elevation useable for cathode and fixed bias mode ... dividing the bleeder-resitor is one chance
Am Anfang wurde das Universum erschaffen. Das machte viele Leute sehr wütend und wurde allenthalben als Schritt in die falsche Richtung angesehen ...

Offline roseblood11

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Re: Vorstellung 5Ä3
« Antwort #136 am: 29.09.2017 13:51 »
That should be standard in any modern amp...

Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #137 am: 2.10.2017 13:29 »
hello, what do you guys suggest to attach the chassis to an amp in a marshall like format (controls to the front of the head of the cabinet)

it has to be something that you can just tighten from outside the cabinet without holding it from the inside while you tighten from the outside.

thanks

Offline Bluesboge

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Re: Vorstellung 5Ä3
« Antwort #138 am: 2.10.2017 15:13 »
ganz Klassisch ist ja ein 5E3.... 8)

Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #139 am: 10.10.2017 18:45 »
Hi,

if you are still chasing hum in these amps then try connecting the ends of the two 100R resistors that are currently going to the star ground t o the cathode of the output tubes. It is sufficient to connect them to the cathode side of R23 on the board.

This results in a modest heater elevation (poor man's heater elevation, even Valco did it) when the amp is operated in cathode bias mode. You can easily compare the result by switching between the cathode and fixed bias mode, as in the fixed bias mode this elevation is rendered ineffective.

If this helps, a permanent heater elevation working in both modes is also not too hard to implement.

cheers,

max

hello, i've tried this method but didn't noticed any difference between fixed and cathode bias

Offline nunonaos

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Re: Vorstellung 5Ä3
« Antwort #140 am: 10.10.2017 18:49 »
some pictures of my diy cabinet

Offline hatta

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Re: Vorstellung 5Ä3
« Antwort #141 am: 11.10.2017 08:15 »
Nice ! :topjob:


Can you make some soundfiles? 8)