Building The Rocket :)

Express, Liverpool, Rocket, Dirty Little Monster, etc.

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brejna
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Re: Building The Rocket :)

Post by brejna »

Thanks for info, I've searched a little bit about hum and it should be closer to 60hz hum.. I will check all of my groundings like you said and see if there is improvement.
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pompeiisneaks
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Re: Building The Rocket :)

Post by pompeiisneaks »

60Hz hum is from the heaters, as that's non rectified. The 120Hz comes post rectification but where you're getting some of the noise form the power amp stage into the preamp side.

Usually anyway...

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brejna
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Re: Building The Rocket :)

Post by brejna »

This hum comes when I flip standby switch, so it should be after rectification, right? Also I will post picture with my grounding points.

Thanks
Brane
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pompeiisneaks
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Re: Building The Rocket :)

Post by pompeiisneaks »

correct, a good video to watch to help detect the difference in tone between the 60 and 120 hz is here:


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brejna
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Re: Building The Rocket :)

Post by brejna »

Thanks, I am following Uncle Doug's channel and I watched that video.. He is sharing awesome stuff.. BTW I tried amp in practice room and I think noise isn't that bad when I am using it band environment.. Also this thing is LOUD!! :) I love it!
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brejna
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Re: Building The Rocket :)

Post by brejna »

I sorted out hum problem :) I grounded 47k resistor before PI with B+1,2 and 3 filter cap ground.
Thanks for your help.
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brejna
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Re: Building The Rocket :)

Post by brejna »

And here it is.. Thanks everyone for your help.

Cheers
Brane

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sagitt
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Re: Building The Rocket :)

Post by sagitt »

well done!transformers are from Odeon,Rijeka?how they sound?
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brejna
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Re: Building The Rocket :)

Post by brejna »

Thanks, they are from Belgrade. P&K made them for me. They sound really good and they are low noise.

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joeboo88
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Re: Building The Rocket :)

Post by joeboo88 »

Nice Job!
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brejna
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Re: Building The Rocket :)

Post by brejna »

joeboo88 wrote: Thu Jun 08, 2017 11:59 amNice Job!
Thanks :)
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brejna
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Re: Building The Rocket :)

Post by brejna »

Little update...
I have decide to ad reverb to my rocket and yesterday I got parts and I finished it, buuuut.. Just before I connect the amp, chassis fell and rectifier tube is gone. At the first I thought it was just the plastic pin, but it is obvious glass is broken and ofcourse I don't have spare.. ImageImage

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