Hudson Electronic Broadcast  [traced]

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Hudson Electronic Broadcast

Postby tipunk777 » 30 Oct 2015, 15:21

Hello.

I'm a new user of this forum and a french guy, so excuse me if my words are not precise.

I'm looking for this pédal... Image
Image

They say that is inspired by an old RCA broadcast mic preamp. Did anyone have anything about it ?

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Re: Hudson Electronic Broadcast

Postby johnk » 23 Dec 2016, 04:38

i have the 9V version but added a charge pump to make it run on 18V internally.
the original is built on veroboard, but here's my PCB layout for it:
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Re: Hudson Electronic Broadcast

Postby aishabag23 » 23 Dec 2016, 17:00

The guys over at TagboardFX have done a few vero layouts of this one:

http://tagboardeffects.blogspot.com/201 ... dcast.html
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Re: Hudson Electronic Broadcast

Postby Manfred » 23 Dec 2016, 18:11

Where I can find the schematic of it.
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Re: Hudson Electronic Broadcast

Postby johnk » 24 Dec 2016, 01:58

i drew up a schematic for my 9V version today. it's the one with the trimpot for the high gain.

Image

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Re: Hudson Electronic Broadcast

Postby johnk » 24 Dec 2016, 06:16

just an FYI. i built both versions (the newer 24V version and the original 9V version which i own) and i like the original 9V version running on 18 or 24 volts better, so i drew up another PCB & built the older version and it sounds identical to my original.

here's the PCB layout for the one that i prefer:
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Re: Hudson Electronic Broadcast

Postby Manfred » 24 Dec 2016, 13:40

I have a further question.
Are gain selections of the transistor needed?
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Re: Hudson Electronic Broadcast

Postby johnk » 24 Dec 2016, 17:03

i've tried OC44's, OC71's and OC 75's and all of them sound pretty much the same.

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Re: Hudson Electronic Broadcast

Postby johnk » 25 Dec 2016, 21:31

i just finished my polished & etched 1590B early version 9V Broadcast (with internal 25V charge pump), with all top jacks and a relayed true bypass:

Image

Image
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Re: Hudson Electronic Broadcast

Postby fuzzbunny » 25 Dec 2016, 22:46

Great work John K.! (as always...)
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Re: Hudson Electronic Broadcast  [traced]

Postby johnk » 30 Dec 2016, 08:49

i forgot one resistor in the above schematic!

here's the correct one:
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Re: Hudson Electronic Broadcast

Postby aishabag23 » 12 Jan 2017, 04:55

johnk wrote:i just finished my polished & etched 1590B early version 9V Broadcast (with internal 25V charge pump), with all top jacks and a relayed true bypass:

[ Image ]

[ Image ]


Just perfect!
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Re: Hudson Electronic Broadcast

Postby gigelmargel » 11 Feb 2017, 21:27

Hello!

Anyone can post the voltages of the transistors, mainly the ones of OC74?
I have only some AC128s and I want to know if are biased right or not.

Thank you!
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Re: Hudson Electronic Broadcast

Postby gigelmargel » 27 Feb 2017, 18:32

:scratch:
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Re: Hudson Electronic Broadcast

Postby V1nce69 » 15 Dec 2017, 16:48

johnk wrote:i drew up a schematic for my 9V version today. it's the one with the trimpot for the high gain.

[ Image ]



I just traced my Broadcast 24V. I unsoldered all diodes on the power supply board to be sure of the type. I made an true to the original vero layout and measured the voltages on both transistors.

Hudson Electronics Brodcast 24V, PG Edition_vero layout.pdf


If you have any questions feel free to ask. I took many pictures. I can post them later.

Vincent
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Re: Hudson Electronic Broadcast

Postby V1nce69 » 16 Dec 2017, 06:00

I just traced my Broadcast 24V. I unsoldered all diodes on the power supply board to be sure of the type. I made an true to the original vero layout and measured the voltages on both transistors.

Hudson Electronics Brodcast 24V, PG Edition_vero layout.pdf


If you have any questions feel free to ask...

Vincent


And here are all the pictures:

01.front-view.jpg


02.gutshots-and-bottom-plate.jpg


03.gutshots.jpg


04.main-board_top.jpg


05.main-board_bottom.jpg


06.power-supply-board_top.jpg


07.power-supply-board_bottom.jpg


08.potentiometers.jpg


09.gain-switch.jpg


10.power-supply-V+in.jpg


11.power-supply-V+out.jpg












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Re: Hudson Electronic Broadcast

Postby plush » 29 Jan 2018, 10:45

Hi!

I can verify V1nce69's work.
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Re: Hudson Electronic Broadcast

Postby teddeeh » 19 Mar 2018, 13:54

Heres a couple of photos i have found of the dual footswitch.
Sadly no underside but could be worrh an experiment or two in decifering this layout, as wehave the original one to go from and fundamentally they are the same.

A778CDAB-7E76-4FB2-B512-9E3F83B15AFD.jpeg

2F6D99F8-FF82-47CF-80B2-43BD9A2C8422.jpeg
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