Bearfoot - Model H  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
User avatar
LooseCannon
Solder Soldier
Information
Posts: 178
Joined: 17 Mar 2010, 04:52
Has thanked: 8 times
Been thanked: 4 times

Post by LooseCannon »

One more question guys:
What changes need to be made to make the 4H version, besides the treble knob?

Thanks

User avatar
fretzburner
Breadboard Brother
Information
Posts: 96
Joined: 10 Jun 2011, 12:07
Been thanked: 4 times

Post by fretzburner »

Just finished my Model H 4 knob(no LED yet)
Image
keep photos online
I liked the sound and will replace my mercury clone with this.
* already installed the LED.

User avatar
monkeyxx
Resistor Ronker
Information
Posts: 279
Joined: 12 Jan 2011, 06:54
Has thanked: 52 times
Been thanked: 51 times

Post by monkeyxx »

nice work!

User avatar
fretzburner
Breadboard Brother
Information
Posts: 96
Joined: 10 Jun 2011, 12:07
Been thanked: 4 times

Post by fretzburner »

monkeyxx wrote:nice work!
Thanks

User avatar
Victor Nery
Information
Posts: 49
Joined: 18 Nov 2011, 03:29
Has thanked: 31 times
Been thanked: 6 times

Post by Victor Nery »

Greetings,

What are the differences between the 3 knobs version and the 4 knobs version? I plan to trace a layout for it but I thought it would be nice to add the fourth control (treble). What should I add, eliminate or change according to the scheme posted in this topic?

Thanks in advance

User avatar
LooseCannon
Solder Soldier
Information
Posts: 178
Joined: 17 Mar 2010, 04:52
Has thanked: 8 times
Been thanked: 4 times

Post by LooseCannon »

Could I use 180k or 220k resistors instead of the 200k resistors?

If so, which value would work better?

Thanks

User avatar
phibes
Transistor Tuner
Information
Posts: 1107
Joined: 10 Dec 2008, 01:17
my favorite amplifier: HIWATT motherfucker!
Location: United States
Has thanked: 75 times
Been thanked: 189 times
Contact:

Post by phibes »

LooseCannon wrote:Could I use 180k or 220k resistors instead of the 200k resistors?

If so, which value would work better?

Thanks
Yeah, either value will work. 200K is a less common value. Everyone's got 220K's laying around.
GuitarlCarl - "TGP = The Gear Polishers"

Image Ken

User avatar
LooseCannon
Solder Soldier
Information
Posts: 178
Joined: 17 Mar 2010, 04:52
Has thanked: 8 times
Been thanked: 4 times

Post by LooseCannon »

thanks man

User avatar
lovetone
Information
Posts: 19
Joined: 13 Nov 2009, 12:20
Been thanked: 8 times

Post by lovetone »

Has anyone seen the 5 knob version?

It sounds real nice on video demo

User avatar
jawacan
Information
Posts: 1
Joined: 20 Sep 2011, 14:08
Has thanked: 3 times
Been thanked: 1 time

Post by jawacan »

Also kind of curious about the 5 knob version and the ”full clean” version… anybody who knows whats going on there?

User avatar
Frank_NH
Solder Soldier
Information
Posts: 246
Joined: 12 Jun 2013, 14:18
Has thanked: 114 times
Been thanked: 152 times

Post by Frank_NH »

FYI. I recently revisited an old vero build of the Model H that I didn't box up. I remembered that I liked the distortion but the tone lacked some treble and the tone control wasn't all that effective. I looked at the circuit in LTSpice and found that decreasing 22 nF capacitor at the output of the first jfet (C14) to 2.2 nF improved the treble response and also made the tone control more effective. If you want to have the option to go back to 22 nF, you could put a 18 or 22 nF capacitor on a switch in parallel to the 2.2 nF, but I don't think it's necessary. I went ahead switched out the 22 nF capacitor on my old vero and it sounds great! :D

User avatar
sopapo1
Information
Posts: 30
Joined: 26 Dec 2007, 03:01
Has thanked: 13 times
Been thanked: 1 time

Post by sopapo1 »

Hello, I am interested in this pedal, I have built the dyna red distortion and its great¡¡... I have the vero of this almost finished...
I would like to know if the biasing of the two first jfet is the standard at vcc/4,5 vcc? we have some voltages to check?
In the dyna red there is a 5458 that is working as a buffer, the biasing is at 1,4-1,8v, not the standard vcc/2, this is said by the man himself. I try to bias this 5458 at 4,5v and the sound changed, its not bad but the touch sensibility that this pedal is known for, dissapeared, so I let it in the intended way.

User avatar
Frank_NH
Solder Soldier
Information
Posts: 246
Joined: 12 Jun 2013, 14:18
Has thanked: 114 times
Been thanked: 152 times

Post by Frank_NH »

I didn’t bias either jfet but you could install trimmers (temporarily) and see what drain resistance sounds best.

I’m currently rebuilding my vero and can report my voltages when I get the opportunity.

User avatar
sopapo1
Information
Posts: 30
Joined: 26 Dec 2007, 03:01
Has thanked: 13 times
Been thanked: 1 time

Post by sopapo1 »

Ok, thanks, look forward for it...

Post Reply