Throbak - Strangmaster  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Throbak - Strangmaster

Postby Manfred » 17 Aug 2017, 21:21

In the shot you can see well the Germanium transistor typ 2SD96.
Who knows the applied Silicon transistor type on?

ThrobakStrangmasterShot.jpg
You do not have the required permissions to view the files attached to this post.
Manfred
Diode Debunker
 
Posts: 941
Joined: 05 Apr 2009, 00:42
Has thanked: 1050 times
Have thanks: 635 times

Re: Throbak strangmaster

Postby dv8r601 » 19 Aug 2017, 08:01

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.

For this message the author dv8r601 has received thanks:
Manfred (19 Aug 2017, 09:33)
dv8r601
Breadboard Brother
 
Posts: 89
Joined: 08 Oct 2011, 08:28
Location: Mississippi
Has thanked: 409 times
Have thanks: 23 times

Re: Throbak strangmaster

Postby Manfred » 19 Aug 2017, 09:39

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?
Manfred
Diode Debunker
 
Posts: 941
Joined: 05 Apr 2009, 00:42
Has thanked: 1050 times
Have thanks: 635 times

Re: Throbak strangmaster

Postby dv8r601 » 22 Aug 2017, 00:36

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.
dv8r601
Breadboard Brother
 
Posts: 89
Joined: 08 Oct 2011, 08:28
Location: Mississippi
Has thanked: 409 times
Have thanks: 23 times

Re: Throbak strangmaster

Postby bc108 » 06 Aug 2018, 23:44

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.
bc108
 
Posts: 47
Joined: 04 May 2017, 16:39
Has thanked: 20 times
Have thanks: 1 time

Re: Throbak strangmaster  [traced]

Postby Manfred » 26 Jan 2019, 22:58

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:
ThrobakShot1.jpg

ThrobakShot2.jpg

ThrobakShot3.jpg

StrangMasterSchematic.jpg

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.
StrangMasterMeasurements.zip
You do not have the required permissions to view the files attached to this post.

For this message the author Manfred has received thanks: 5
bc108 (27 Jan 2019, 00:13), dv8r601 (31 Jan 2019, 23:12), fernandorock13 (28 Jan 2019, 18:57), ilshat (05 Feb 2019, 16:43), karul (27 Jan 2019, 01:40)
Manfred
Diode Debunker
 
Posts: 941
Joined: 05 Apr 2009, 00:42
Has thanked: 1050 times
Have thanks: 635 times

Re: Throbak strangmaster

Postby jalmonsalmon » 02 Apr 2019, 18:59

I am kind of wondering what effect that 220p cap has on the input to ground :scratch:
User avatar
jalmonsalmon
Solder Soldier
 
Posts: 205
Joined: 14 Sep 2012, 23:49
Has thanked: 81 times
Have thanks: 24 times

Re: Throbak strangmaster

Postby Manfred » 02 Apr 2019, 20:21

jalmonsalmon wrote:I am kind of wondering what effect that 220p cap has on the input to ground :scratch:


The capacitor serves to supress radio frequencies.

For this message the author Manfred has received thanks: 2
ilshat (27 Oct 2019, 18:28), jalmonsalmon (03 Apr 2019, 03:09)
Manfred
Diode Debunker
 
Posts: 941
Joined: 05 Apr 2009, 00:42
Has thanked: 1050 times
Have thanks: 635 times

Re: Throbak strangmaster

Postby RSWRecording » 07 Apr 2019, 00:43

jalmonsalmon wrote:I am kind of wondering what effect that 220p cap has on the input to ground :scratch:


Same thing I was wondering.
RSWRecording
 
Posts: 2
Joined: 07 Apr 2019, 00:40
Has thanked: 0 time
Have thanks: 0 time

Re: Throbak - Strangmaster

Postby modman » 13 Apr 2019, 22:18

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 ;-)
User avatar
modman
a d m i n
 
Posts: 4347
Joined: 19 Jun 2007, 17:57
Has thanked: 3293 times
Have thanks: 611 times


Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: art7710, matt239 and 14 guests