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Smashup Voltage [resolved]
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Topic: Smashup Voltage [resolved] (Read 1546 times)
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #30 on:
February 22, 2022, 11:05:33 AM »
In your build where does the power supply connect to the chassis?
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #31 on:
February 22, 2022, 11:31:42 AM »
everything goes to a grounding post.
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #32 on:
February 22, 2022, 11:37:23 AM »
You have umbilicals in your build, so is each chassis plate connected through the umbilical?
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #33 on:
February 22, 2022, 11:51:27 AM »
they are two umbilicals, one for the filament of the 4p1l's that is two wires and the other has 3 , one is ground and the other two are both 150v, one for each channel .
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #34 on:
February 22, 2022, 11:56:33 AM »
so you have each chassis plate connected through the audio ground?
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #35 on:
February 22, 2022, 12:19:15 PM »
yes Sir
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #36 on:
February 22, 2022, 12:41:18 PM »
That is a potential source of noise. Ideally you would have the chassis plates connected together through their own wire in the umbilical and that would be hard grounded to the E lug on the IEC power entry module, then the audio/power supply ground would run separately and you would put the antiphase diodes in the amp section between the audio ground and the chassis.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #37 on:
February 22, 2022, 01:02:30 PM »
audio ground would be the part where the RCA are connected to the ground?
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1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #38 on:
February 22, 2022, 01:04:25 PM »
never mind my last comment
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1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #39 on:
February 22, 2022, 02:44:10 PM »
just finished and its still a little buzz
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1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #40 on:
February 22, 2022, 03:17:19 PM »
now I don't know if you noticed but I don't have the pots nor the attenuators at the input, I'm just using the volume from my OPPO player.
could that be the reason for the little buzz/noise?
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #41 on:
February 22, 2022, 04:11:40 PM »
What is at the input of the pre? Just jacks wired to the grids of the 4P1L?
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #42 on:
February 22, 2022, 05:00:54 PM »
yes
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Paul Birkeland
Global Moderator
Hero Member
Posts: 18147
Re: Smashup Voltage [resolved]
«
Reply #43 on:
February 22, 2022, 05:15:27 PM »
You should have a 47K resistor from grid to ground on each 4P1L. If you pull the RCA cables, the grid has no ground reference and that can cause damage to the 4P1Ls.
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Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
1026mind
Jr. Member
Posts: 44
Re: Smashup Voltage [resolved]
«
Reply #44 on:
February 23, 2022, 03:49:52 AM »
when I purchased the smashup upgrade I got the smash quiet to. I want to built it but I have do diagram. Is it possible to get one?
Thank you! Btw I'm waiting on the attenuators, they are in the mail from France
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Smashup Voltage [resolved]