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Crybaby GCB 95 mod -update-

 
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vulture



Joined: 01 Mar 2008
Posts: 4503
Location: Chicago

PostPosted: Sat May 13, 2017 10:32 pm    Post subject: Crybaby GCB 95 mod -update- Reply with quote

Bought mine about 17 years years ago. Over the years modded the resistors, true bypass, added a new pot etc.

Digging through my parts bin found about a dozen inductors from a '69 Thomas Organ that I bought for "you haul it out its yours price." Anyways I parted it out it years ago and forgot about the inductors (still a goldmine for carbon comps).

Had some downtime so I cracked it open, did some in series tone stacking with them, threw in a dpdt to switch out a couple of them and its now vintage tone universe. Super vowel like, great sweep and a more expansive range.

Pics and details about inductors later.
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Last edited by vulture on Thu May 18, 2017 11:05 pm; edited 1 time in total
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vulture



Joined: 01 Mar 2008
Posts: 4503
Location: Chicago

PostPosted: Thu May 18, 2017 11:04 pm    Post subject: Reply with quote

Its pretty amazing how thin sounding the stock this pedal is and why so many have modded this. Note: Did not take Mhz rating on this, just audio testing between various distortion pedals and Fuzzy's like Tone Bender, Fuzzface, Supafuzz are really sweet sounding. This dials in the that Vox Clyde McCoy tone


Basic Mods (as seen everywhere on the web)
33k stock mod to 68k
390ohm stock mod to 330ohm
1.5k modded to 2.7k
.01uf cap remained.
Tried all these on respective pots, but it was too subtle to notice.
Swapped in a hot potz.
Swapped out footswitch for a DPDT.
Cut some traces to make it true bypass.



Mods in pic:
50K pot wired into 68k
(2) 18ohm inductors wired in series with a switchable 3rd(5ohm) or 4th(87ohm) that is wired into a DPDT switch.
5k pot wired to 4th inductor.
10ohm resistor


Mods function:
50k pot changes the intensity of the wah's range, from zero to full wah.

At any given moment there is 3 inductors in series. The DPDT switches between first stage of inductors that totals (2) 18ohm + (1)5ohm + (1)10ohm(wired on board)=51ohms. This is a perfect mix for clean signal, distortion and some fuzzes. The second stage is (2) 18ohm + (1)87ohm + 10ohm(wired on board)=133ohm. This allows for a lot more bass to come through, adding a 5k pot to the 87ohm can drop the 87ohm down to 0ohms thus allowing for a full range of how much bass can be pronounced. This is perfect for some fuzzes with a heavy bass as some fuzzes without buffer can shift the frequency range into unwanted territory.




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BluesmanDave



Joined: 17 Nov 2008
Posts: 2815
Location: Sacramento CA

PostPosted: Fri May 19, 2017 9:34 am    Post subject: Reply with quote

That's pretty dang clever. Thanks for the pics! Any hope of some sound clips?
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vulture



Joined: 01 Mar 2008
Posts: 4503
Location: Chicago

PostPosted: Sat May 20, 2017 10:17 pm    Post subject: Reply with quote

One more for the road. Was messing around with some buffer circuits for this an inadvertently grounded the lug of the pot with a resistor. Like what it did so I threw in a switchable 10k resistor that runs parallel with the pot. It changes the dynamic in a good way, makes it a little thinner sounding without affecting the sweep almost like the stock Crybaby with a little extra bass.

BluesmanDave. Thanks. Will have to make some samples and post soon.


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