Throbak - Strangmaster [traced]
- Manfred
- Tube Twister
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In the shot you can see well the Germanium transistor typ 2SD96.
Who knows the applied Silicon transistor type on?
Who knows the applied Silicon transistor type on?
- dv8r601
- Breadboard Brother
Dont get upset if I'm wrong but I think it was a bc108b in mine or maybe a 2n2222. I had it a while back and never messed with it because it sounded pretty good as it was.
- Manfred
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Thanks for your the answer.
In view of the current gain the 2N2222 is more likely.
Do you know the values of the other components too?
In view of the current gain the 2N2222 is more likely.
Do you know the values of the other components too?
- dv8r601
- Breadboard Brother
I didn't take time to write anything down when I had it, now thinking about it I'm almost certain it was an 2n2222a. Plus, They use them in alotta other pedals they make, so I'm pretty sure that is it. I'll see if the new owner can take some board shots and get back to me. I wanna make one myself, because it was a killer od pedal.
- bc108
- Breadboard Brother
For sure, it seems that they use 2n2222: maybe due the low hfe (like the Ge's one's).
For reference, take a look to the Catalinbread Naga Viper; Rangemaster NPN version, some add's and use a 2N2222 transistor.
For reference, take a look to the Catalinbread Naga Viper; Rangemaster NPN version, some add's and use a 2N2222 transistor.
- Manfred
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I bought an used Strangmaster several months ago, I sold it in the meantime.
I made some shots and traced the PCB.
Furthermore, a made some measurements.
Here are the results: Read transistor values:
NPN Silicon BJT 2N2222A:
hFE=258 at Ic=5,02mA
Vbe=0,752V at Ib=5,00mA
VceSat=0,018V at Ic=5,0mA and Ib=1,00mA
IcLeak=0.000mA
NPN Germanium BJT 2SD30:
hFE=119 at Ic=5,01mA
Vbe=0,298V at Ib=5,00mA
VceSat=0,017V at Ic=5,0mA and Ib=1,00mA
IcLeak=0,176mA
I made output traces using different input signal voltages at different bias pot settings.
I measured the frequency response too.
You can find the readings in the following ZIP-file.
All diagrams were labeled.
I made some shots and traced the PCB.
Furthermore, a made some measurements.
Here are the results: Read transistor values:
NPN Silicon BJT 2N2222A:
hFE=258 at Ic=5,02mA
Vbe=0,752V at Ib=5,00mA
VceSat=0,018V at Ic=5,0mA and Ib=1,00mA
IcLeak=0.000mA
NPN Germanium BJT 2SD30:
hFE=119 at Ic=5,01mA
Vbe=0,298V at Ib=5,00mA
VceSat=0,017V at Ic=5,0mA and Ib=1,00mA
IcLeak=0,176mA
I made output traces using different input signal voltages at different bias pot settings.
I measured the frequency response too.
You can find the readings in the following ZIP-file.
All diagrams were labeled.
- jalmonsalmon
- Solder Soldier
I am kind of wondering what effect that 220p cap has on the input to ground
- Manfred
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The capacitor serves to supress radio frequencies.jalmonsalmon wrote:I am kind of wondering what effect that 220p cap has on the input to ground
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Same thing I was wondering.jalmonsalmon wrote:I am kind of wondering what effect that 220p cap has on the input to ground
- modman
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I didn't mean to lock this topic, just happened because it was put on solved in the wrong folder.
Keep on necrobumpin' that shit
Keep on necrobumpin' that shit
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal
- Manfred
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I measured a few more values before I sold the device: