Big Monk
Well-known member
I missed that!
Tone Bender Mk2 Transistors?....
- Thread starter PaulPauliePabloPaolo
- Start date
I missed that!
PaulPauliePabloPaolo
Member
Thanks for the answer, and yea.... I too also suffer that kind of ocd when it comes to things like this...I'll be doing the same I'm sure!.
I don't see any trimmers on the PCB for the Mk.2 from here, but maybe a picture of the inside of your build might help me understand where the biasing resistors go?. Im now presuming that specific resistors in the circuit will deal with biasing the transistors. SB are providing the resistor values that they recommend for those positions.
Hopefully all will become clear when things start turning up.
Thanks gang!... Stellar as always.
Big Monk
Well-known member
I wouldn't use those.
I had an email exchange with Steve when he was still running SBE and he admitted his bias points for the MK II follow the Fuzz Central voltages which are wrong.
When the transistors come on, post here on the forum and we can help you determine the best values to get Q1 and Q3 up over 7 vDC.
PaulPauliePabloPaolo
Member
Thanks very much!
PaulPauliePabloPaolo
Member
So.... This was interesting!...
I ordered (and paid) 3 sets of transistors yesterday for the builds for myself and my friends with an online stock of 10sets.
Today I get an email from SBE saying they can only ship two, and how would I like to proceed with the additional money they took from my account?...Store credit or wait for availability of next shipment (whenever that might be!)?.
Not a great first experience with SBE!???... and what happened to all the other sets?. you b'stards!. haha
Should I...
A. Cancel the whole order out of protest of the 'treatment'.
B. Wait for them to get more stock?.
Or...
C. Just smash the place up, and then realise its only guitar pedals and have a beer.
Answers on a postcard!
*I actually just read the email again in not so much of a fury and they said their head engineer is away until the 11th and will make more sets from then.
**And just a few hours after my response, I got another e-mail saying they have found another set.
I guess they are good guys after all as they put in the extra effort to rectify the situation and get another set together.
Bravo SBE. panic averted, the mission is still on!.
I ordered (and paid) 3 sets of transistors yesterday for the builds for myself and my friends with an online stock of 10sets.
Today I get an email from SBE saying they can only ship two, and how would I like to proceed with the additional money they took from my account?...Store credit or wait for availability of next shipment (whenever that might be!)?.
Not a great first experience with SBE!???... and what happened to all the other sets?. you b'stards!. haha
Should I...
A. Cancel the whole order out of protest of the 'treatment'.
B. Wait for them to get more stock?.
Or...
C. Just smash the place up, and then realise its only guitar pedals and have a beer.
Answers on a postcard!
*I actually just read the email again in not so much of a fury and they said their head engineer is away until the 11th and will make more sets from then.
**And just a few hours after my response, I got another e-mail saying they have found another set.
I guess they are good guys after all as they put in the extra effort to rectify the situation and get another set together.
Bravo SBE. panic averted, the mission is still on!.
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Feral Feline
Well-known member
PaulPauliePabloPaolo
Member
Wow, I haven't seen that before!... A penny for postage to good ole Blighty!... If only...
..That is most def. an A for effort and the cool Postcard!!!!
I will now have 3 beers!.... Cheers!
PaulPauliePabloPaolo
Member
Hey Gang,
Thought Id show you what turned up today after its 3358m trip.... 3 sets (2 pics each as I turned the packets round so you could see the transistor).
Wondered if you guys could 'clue me in' to what I have, and what you think about the sets. Which set you'd prefer, and why?.
Seems like a few different types going on here, but some of the usual suspects turned up OC71, OC75, OC77 (mil spec?).
Which set would you keep for yourself?. and why!?!?!?!
Seems like they're all obeying the ratios of gain that have been discussed here.... Q1&2 ~ 60 and Q3 ~ 120.
Waiting for the PCBs to get here so I can start putting these beaut's together and make some sweet sweet solo's.
Let me know what you think.... and thankyou again for the wealth of knowledge and comedy that I have found here!.
P.
Thought Id show you what turned up today after its 3358m trip.... 3 sets (2 pics each as I turned the packets round so you could see the transistor).
Wondered if you guys could 'clue me in' to what I have, and what you think about the sets. Which set you'd prefer, and why?.
Seems like a few different types going on here, but some of the usual suspects turned up OC71, OC75, OC77 (mil spec?).
Which set would you keep for yourself?. and why!?!?!?!
Seems like they're all obeying the ratios of gain that have been discussed here.... Q1&2 ~ 60 and Q3 ~ 120.
Waiting for the PCBs to get here so I can start putting these beaut's together and make some sweet sweet solo's.
Let me know what you think.... and thankyou again for the wealth of knowledge and comedy that I have found here!.
P.
Attachments
PaulPauliePabloPaolo
Member
Hey Ya'll,
I just wanted to check the values for the biasing resistors and see if there was any advice on doing this?... before I get too excited and start soldering things in....
Im starting with the set below (set 3 from previous. post).
I did notice that the resistors use a slightly different designation from the schematic provided for the build docs and the one listed on the packet below. (prob. cause of the power inversion network).
A. R3 on the Transistor packet (47K) seems to correspond to R5 on the build docs (100K).
B. R4 on the Transistor packet (100K) seems to correspond to R4 on the build docs (100K).
C. R6 on the Transistor packet (8K2) seems to correspond to R7 on the build docs (8K2).
So my question would be what to follow on the first resistor?... And how to determine this. Obviously I think the general opinion would be to follow the Transistor packet and use a 47K for R5?.
Hope you can help.... my trigger finger is itchy.
I just wanted to check the values for the biasing resistors and see if there was any advice on doing this?... before I get too excited and start soldering things in....
Im starting with the set below (set 3 from previous. post).
I did notice that the resistors use a slightly different designation from the schematic provided for the build docs and the one listed on the packet below. (prob. cause of the power inversion network).
A. R3 on the Transistor packet (47K) seems to correspond to R5 on the build docs (100K).
B. R4 on the Transistor packet (100K) seems to correspond to R4 on the build docs (100K).
C. R6 on the Transistor packet (8K2) seems to correspond to R7 on the build docs (8K2).
So my question would be what to follow on the first resistor?... And how to determine this. Obviously I think the general opinion would be to follow the Transistor packet and use a 47K for R5?.
Hope you can help.... my trigger finger is itchy.
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andare
Well-known member
While we wait for the experts to chime in I'll just suggest you breadboard the circuit and see for yourself. I did and the 3 transistors I chose from my stash, with somewhat standard gain, all bias in the ballpark and the circuit sounds great.
Breadboarding is a game changer. You can build any circuit quickly and non destructively. If it sounds bad you can reuse the components and never buy the PCB for a pedal you won't enjoy. The tutorials on this forum are what got me started.
Breadboarding is a game changer. You can build any circuit quickly and non destructively. If it sounds bad you can reuse the components and never buy the PCB for a pedal you won't enjoy. The tutorials on this forum are what got me started.
PaulPauliePabloPaolo
Member
Thats a really good point!.... I don't have a breadboard but I will get one. These smaller circuits seem like they wouldn't be too complicated to lay out, and as you say... I actually could have a listen prior to soldering.
Also just popped into my mind... You guys all socket the transistors?.
ICTRock
Well-known member
I don't but you certainly can. Some guys take the transistors with them when they find a good set.
Big Monk
Well-known member
I don;t socket transistors. I always breadboard.
PaulPauliePabloPaolo
Member
Are we saying that the procedure for finding the correct values is to breadboard the circuit first?
As I currently don't have a breadboard (I will get one and learn how to use it), would another solution be to put sockets on the R5 resistor lugs and experiment between 47K and 100K until I find what I like sonically?.... (or until the voltage is correct?... best values to get Q1 and Q3 up over 7 vDC.).
As I currently don't have a breadboard (I will get one and learn how to use it), would another solution be to put sockets on the R5 resistor lugs and experiment between 47K and 100K until I find what I like sonically?.... (or until the voltage is correct?... best values to get Q1 and Q3 up over 7 vDC.).
Coda
Well-known member
Yes. Make sure that you correctly identify the pcb component, though. Compare the schematics so you know which component is which; the ID’s for the PPCB board may not match the schematic used to bias your transistors…
PaulPauliePabloPaolo
Member
Ahhh ok.... As I said, I don't have one, and I don't know how to use one, but I will get one and go through the instructional material.
Good point about identifying the components, I did go through them with my limited knowledge and experience and I came up with....
A. R3 on the Transistor packet (47K) seems to correspond to R5 on the build docs (100K).
B. R4 on the Transistor packet (100K) seems to correspond to R4 on the build docs (100K).
C. R6 on the Transistor packet (8K2) seems to correspond to R7 on the build docs (8K2).
Could anyone confirm that?.
Anyone got any thoughts on how to proceed without a Breadboard? is Socketing R5 a viable 'workaround'?.
I do have a DMM and an M tester.
Good point about identifying the components, I did go through them with my limited knowledge and experience and I came up with....
A. R3 on the Transistor packet (47K) seems to correspond to R5 on the build docs (100K).
B. R4 on the Transistor packet (100K) seems to correspond to R4 on the build docs (100K).
C. R6 on the Transistor packet (8K2) seems to correspond to R7 on the build docs (8K2).
Could anyone confirm that?.
Anyone got any thoughts on how to proceed without a Breadboard? is Socketing R5 a viable 'workaround'?.
I do have a DMM and an M tester.
PaulPauliePabloPaolo
Member
Hey gang,
Just wanted to make sure I get the orientation of the transistors correct.
Very kindly SBE gives the red dot as the collector.... but on the silkscreen there is no CBE markings, but there is a 'tab' next to the socket like you would have on metal can transistors. As stated before I am not using OC81's, but OC75's and an OC71.
They are not the metal can type but I do see on the web that the 'tab' is usually next to the emitter.
I just wanted to make sure before I install them.
Also I tested them quickly with an M Tester and they all test as resistors.... Is this something 'normal'... just seemed a little strange as Ive tested a few Si transistors and they tested fine and gave me the pin out correctly.
Thanks in advance, and I will await the wisdom of the forum!.
P.
Just wanted to make sure I get the orientation of the transistors correct.
Very kindly SBE gives the red dot as the collector.... but on the silkscreen there is no CBE markings, but there is a 'tab' next to the socket like you would have on metal can transistors. As stated before I am not using OC81's, but OC75's and an OC71.
They are not the metal can type but I do see on the web that the 'tab' is usually next to the emitter.
I just wanted to make sure before I install them.
Also I tested them quickly with an M Tester and they all test as resistors.... Is this something 'normal'... just seemed a little strange as Ive tested a few Si transistors and they tested fine and gave me the pin out correctly.
Thanks in advance, and I will await the wisdom of the forum!.
P.
PaulPauliePabloPaolo
Member
Thanks guys!... Victory!.... I just can't believe how great it sounds!!!... Instant Page, Ronson & Townshend!....
PPCB are undoubtably my favourite source for all things like this, unbelievable quality at a price that makes it possible for 'normal folk' like me and my friends to enjoy these circuits without a 2nd mortgage!.
I am in heaven tonight!.... and no stairway required!.
PPCB are undoubtably my favourite source for all things like this, unbelievable quality at a price that makes it possible for 'normal folk' like me and my friends to enjoy these circuits without a 2nd mortgage!.
I am in heaven tonight!.... and no stairway required!.
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andare
Well-known member
So you managed. Enjoy!Thanks guys!... Victory!.... I just can't believe how great it sounds!!!... Instant Page, Ronson & Townshend!....
PPCB are undoubtably my favourite source for all things like this, unbelievable quality at a price that makes it possible for 'normal folk' like me and my friends to enjoy these circuits without a 2nd mortgage!.
I am in heaven tonight!.... and no stairway required!.
