S. Hawk Ltd. - Hawk II Tonal Expander

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
spaceace76
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Post by spaceace76 »

found this on the other forum, don't how accurate it is though
hawkstuff.gif
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Post by JshDnls »

Cool ! Is there any more information from that forum that might be helpful ?

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Post by spaceace76 »

the original circuit ran off 18v, using two 9v batteries

https://www.diystompboxes.com/smfforum/ ... ic=28578.0

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Post by spaceace76 »

The layout I posted is missing many components, so unless we get better photos we're a bit dead in the water here.

I also emailed Flynn amps about sharing a schematic of Rory's Hawk, and they politely declined. He seemed willing to post one himself once they recoup the costs of producing the pedal, but that may not be for a while.

Anyone have better photos we can use?

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Post by JshDnls »

Perhaps this bloke on eBay is willing to take a couple more pics.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0530135157

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Post by analogguru »

You "only" have to find out the exact center frequencies of the EQ (to calculate the value of inductors), the rest is already done.

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Post by borislavgajic »

Price: £1,000.00 :scratch:

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Post by spaceace76 »

JshDnls wrote:Perhaps this bloke on eBay is willing to take a couple more pics.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0530135157
contacted the seller, said he'd send me the shots tomorrow (but i'm not holding my breath...)

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Post by spaceace76 »

the seller asked if i was actually interested in buying the pedal and being the honest guy i am, i told him i was only looking for a gutshot. anyone else have any ideas?

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Post by DavidRavenMoon »

I used to own one of these back in the 70's. You attached it to your guitar strap. It was so noisy as to be unusable. That's why someone gave it to me! They had bought it new. They were not highly regarded at the time.
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Post by Greg »

DavidRavenMoon wrote:I used to own one of these back in the 70's. You attached it to your guitar strap. It was so noisy as to be unusable. That's why someone gave it to me! They had bought it new. They were not highly regarded at the time.
I think you're talking about another effect.. these are a floor box.
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Post by Dan N »

My two slider was only about 4" X 3". Hanging it off a strap makes sense. You could thread a strap under the leather back protecter patch.
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Post by Greg »

Dan N wrote:My two slider was only about 4" X 3". Hanging it off a strap makes sense. You could thread a strap under the leather back protecter patch.
Was it like this one ?

http://www.effectsdatabase.com/model/shawk/hawk/3

It looks like the same size as the 3 slider... not something I'd want hanging on my strap..
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Post by Grendahl »

analogguru wrote:You "only" have to find out the exact center frequencies of the EQ (to calculate the value of inductors), the rest is already done.

analogguru

Per RG on a certain DIY site:
R.G. wrote: First opamp stage is gain of 0.8db (essentially unity), switchable gains of 14 and 24db with the two switches, which are cumulative.
Treble rolloff starts at 2.6kHz (1.5K and 0.047) and feeds a two-hump resonant EQ, with humps/notches centered at 110Hz and 220Hz.
Not sure if that helps out or not?
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Post by analogguru »

Grendahl wrote:
analogguru wrote:You "only" have to find out the exact center frequencies of the EQ (to calculate the value of inductors), the rest is already done.

analogguru

Per RG on a certain DIY site:
R.G. wrote: First opamp stage is gain of 0.8db (essentially unity), switchable gains of 14 and 24db with the two switches, which are cumulative.
Treble rolloff starts at 2.6kHz (1.5K and 0.047) and feeds a two-hump resonant EQ, with humps/notches centered at 110Hz and 220Hz.
Not sure if that helps out or not?
No it doesn´t, because this information is probably based on my unfinished schematic with wrong inductor values. These two center frequencies don´t make any sense.

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Post by Octopus1992 »

boy, I wanted one
If al least we had some good pictures to se all the tracks and components
It seems to be a really transparent booster, but really loud.
that univox impersonator sounded too weak on youtube.

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Post by ryanuk »

Octopus1992 wrote:boy, I wanted one
If al least we had some good pictures to se all the tracks and components
It seems to be a really transparent booster, but really loud.
that univox impersonator sounded too weak on youtube.
Slightly OT, but whats the deal with the booster anyway?

If youre after a good transparent LOUD boost then there's sooo many other projects you could use to get the same effect?

I note the use of LRC - does this make the circuit particularly resonant? Is this what all the hype centres around?

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Post by Steven_M »

ryanuk wrote:
Octopus1992 wrote:boy, I wanted one
If al least we had some good pictures to se all the tracks and components
It seems to be a really transparent booster, but really loud.
that univox impersonator sounded too weak on youtube.
Slightly OT, but whats the deal with the booster anyway?

If youre after a good transparent LOUD boost then there's sooo many other projects you could use to get the same effect?
But this one is mysterious and rare!

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Post by spaceace76 »

Steven_M wrote:
ryanuk wrote:
Octopus1992 wrote:boy, I wanted one
If al least we had some good pictures to se all the tracks and components
It seems to be a really transparent booster, but really loud.
that univox impersonator sounded too weak on youtube.
Slightly OT, but whats the deal with the booster anyway?

If youre after a good transparent LOUD boost then there's sooo many other projects you could use to get the same effect?
But this one is mysterious and rare!
that's the only reason I'm here :lol:
but really, Rory got a great tone on Calling Card. and not that I'm trying to cop his sound or anything, but I like studying what my favorite players use. Figuring out what they did and why is really helpful for finding my own sound. When I found out this circuit was what Rory used (and NOT a Rangemaster) on that album, and that the pedal has never been traced, it piqued my interest. Others here may think the same thing.

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Post by borislavgajic »

:thumbsup narafski.....naturally

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