Rockett Flexdrive dissected
- Manfred
- Tube Twister
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I traced each diode in the circuit and compared the read traces with reference diode traces.
So I found out as follows.
Ge-diodes are 1N34A green band.
Big Si-diodes are 1N4005.
Small Si-diodes are 1N4148
So I found out as follows.
Ge-diodes are 1N34A green band.
Big Si-diodes are 1N4005.
Small Si-diodes are 1N4148
- Manfred
- Tube Twister
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Hello 287m,
thanks for finding the fault.
Clip: on off on.
Treble on off on
I read the datas of the built-in J201:
Vgs(off)=-0,72V at Id=5,2µA
Vgs(on)=0,38V at Id=1,26mA
gfs=1,9mA/V at Id=0,8mA to 1,3mA
Idss=0,58mA at Vds=3,01V
Rds(on)=549,1O at Id=1,3mA and Vgs=0,0V
thanks for finding the fault.
You are right, the 1N4001 is drawn in wrong orientation, here the corrected schematic.and the 1n4001 look backward for me
Fat: off on.fat = spst
clip = on-on or on-off-on?
treble = on-on or on-off-on?
Clip: on off on.
Treble on off on
I read the datas of the built-in J201:
Vgs(off)=-0,72V at Id=5,2µA
Vgs(on)=0,38V at Id=1,26mA
gfs=1,9mA/V at Id=0,8mA to 1,3mA
Idss=0,58mA at Vds=3,01V
Rds(on)=549,1O at Id=1,3mA and Vgs=0,0V
- tube-exorcist
- Resistor Ronker
I bet the tone control is drawn wrong too and should look like one from a tube-screamer - please verify.
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."
- Manfred
- Tube Twister
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Sorry, I cannot verify the pedal again, because I gave it already away.tube-exorcist wrote:I bet the tone control is drawn wrong too and should look like one from a tube-screamer - please verify.
It was very hard to trace, but I used the tube screamer circuit as pattern and it was not in accordance with the screamer tone control, that amazed me.
The Flexdrive tone control affects nut much in my opinion, it acts rather as treble lift when the knob is turned clockwise.
have a look at
Tone knob variations at the playing time from 3:38 to 3:45.
I think that explains the different tone circuity.
I'm not without fail, maybe a owner of the Flecdrive would be so kind to recheck the tone circuit.
- Manfred
- Tube Twister
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hi,tube-exorcist wrote:I bet the tone control is drawn wrong too and should look like one from a tube-screamer - please verify.
I thougt about the circuit differences and made a circuit simulation.
The shown tone circuity has indeed no effect.
You are right regardíng the screamer tone circuity.
Thanks that you took a closer look at the schematic.
- tube-exorcist
- Resistor Ronker
Now there is only missing a 22k resistor (maybe 2k2) between pin 6 and 7 of the second opamp (instead of the short).
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."
- Manfred
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The short is ok, there is no resistor in between.tube-exorcist wrote:Now there is only missing a 22k resistor (maybe 2k2) between pin 6 and 7 of the second opamp (instead of the short).
- indyguitarist
- Resistor Ronker
No, actually it isn't the TS tone control. you had it right the first time I think. 5k pot across pins 6/7, middle lug goes to a 100r and .022uf IIRC.Manfred wrote:hi,tube-exorcist wrote:I bet the tone control is drawn wrong too and should look like one from a tube-screamer - please verify.
I thougt about the circuit differences and made a circuit simulation.
The shown tone circuity has indeed no effect.
You are right regardíng the screamer tone circuity.
Thanks that you took a closer look at the schematic.
It's been about 10 years since I drew that though so.....