Hudson Electronic Broadcast

[Alex]

That should be correct.
Not sure about the Gain pot orientation.
The same wire in the first picture seems to go to pin 1. In the second seems to go to pin 2.
I think the original transistor was an OC71.

[rocket88]

Figured instead of postinghttps://hudsonelectronicsuk.com/bc-24v-ltd/ this on the main page, I think the 24V layout needs a little tweaking but I could be wrong. According to hudsons website the 24V limited edition has a 3 position gain switch and an internal trimmer go adjust the overall gain.

"Hand selected NOS Valvo black glass Germanium transistor
Specially chosen TRIAD Magnetics steel-core transformer
Alpha potentiometers
Neutrik jack sockets
Heavy duty footswitch (wired for true bypass)
3 position gain switch
Gain trim pot for the HIGH gain mode"

Only picture I could find of one of the 24V limited editions

[Alex]

Sorry Zach but I don't understand your message.
The one in your picture is the one we've reverse-engineered.
Could not find any gut shots of those with the 3 position gain switch.

[rocket88]

something just doesn't make sense to me though. On their site all the 24v pedals say the switch is 3 positions not two and an internal trimmer for total amount of gain. Maybe I'm just missing something, my brain is fried still from finals.

The one that we're basing our trace on looks to me, could be wrong different then the one initially posted in the request. Not saying the layout is wrong, just that something is off from what Hudson says should be there. Besides, should be easy enough to figure out how to change the layout we have to make it fit the description on their site, no?

[Alex]

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The author has deleted this message.

[tipunk777]

Hello,
Rocket88 is alright my pedal is the "peach edition" and got a 3 position gain switch. However there is no internal gain trimmer in (they removed this information on their site...).

[Alex]

Thanks Tipunk.
I've deleted my last post.
Is it an SPDT On-Off-On switch then?

[johnk]

Ciaran Haslett wrote

This more like it?  I'll post a hi res link when it's confirmed.

you have the OC75's emitter and collector reversed of what it should be. rotate it 180 degrees and it should work fine.

[johnk]

after etching and building one according to the schematic posted in this thread, and then comparing it to mine sonically, it's very, very close, but i prefer the sound of my original by just a little bit.

i modded mine to run on 18V internally a while ago and compared it to the new one running on 24V. the original on 18 volts can get perfectly clean, whereas there's a teensy weensy bit of distortion on the 24V one, even with the gain trim all the way down, so i took my original 9V Broadcast apart and traced it. (BTW, mine's the one with the high gain trim pot).

here's the schematic that i drew up for it and i intend to design & etch a PCB for it. hopefully, i will have it built up and ready for testing tonight.

[johnk]

here's the original 9V version's layout. it's on veroboard only it has .133" hole spacing.

[johnk]

update. i etched a PCB and built the one with the high gain trimmer and i gotta say, to me, it sounds a lot better comparing them side by side than the one using the previous schematic in this thread.

[johnk]

got mine done

[johnk]

gut shot:

[Alex]

Compared to Ciaran's schematic C3 & C9 values are different but the strange thing is that C3 & C6 polarities are reversed.

[johnk]

Alex wrote

Compared to Ciaran's schematic C3 & C9 values are different but the strange thing is that C3 & C6 polarities are reversed.

well, if you look at this layout, that's the way that it is on my original:

[Addy Bart]

Beautiful, just beautiful

[Alex]

I've seen the layout. From Teepunk's pictures they seem to be reversed and I was just wondering why they would reverse them on the 24V versions. Maybe we should reverse them too?
If someone that has built the circuit wants to give it a try...

[Riku]

I haven't seen any gut shot with a reversed C3. Not saying there wouldn't be one but just haven't seen. It's always the same way as in Ciaran's schem.

But, C6 is opposite direction on 9V models.

I build mine and added a switch for 9V / 24V and then tried to swap the C6 back on forth.. I hear no difference, nor do I 'feel' any difference.

Weird.

EDIT: Socketed the C6 and did some serious testing with the polarity with my giggin gear today (did use my small practice amp yesterday). Now I think I can tell the difference on the sound. Also did try with both the 9V and 24V.

With the polarity on the C6 as it is on Ciaran's schem (24V version); the sound is a bit clearer and cleaner, a bit less grit and maybe even a tad louder (?) than when it's reversed. This is audible running it at 9V or 24V.
Maybe they reversed the polarity of C6 on the 24V version to make it even more clean and clear sounding in addition to raised headroom and already added clarity of 24V?

[brazdj]

Good evening,

Raising a buried thread here, but hopefully an easy enough question.  Can I build the 9 volt version and then attach a separate 9v/18v charge pump as a daughterboard?  I mean other than making sure my components are adequately rated, does the 9v layout require any alterations to run on 18v?

I would use the 9v/18v charge pump Vero in the charge pump section on this site’s main library. Or if there is a better method, I would love to know!

Thank you in advance for your time,
Daniel

[Vin69Nik]

Hi all,

 I happen to have a Broadcast 24V, Peach Guitars limited Edition. I decided to trace it carefully, took pictures, measured voltages and drew a true to the original vero layout.

It might interest some of you as I noticed some differences in layout and pots' values.

Here are my findings:





















Voltages follow in a 2nd post.


Vincent