Help! Grapevine not working...

[madbean]

I think I will create a tutorial on how to build a simple testing rig, too. You can do one for probably $20.

[gtr2]

You were reading my mind!

[eldanko]

You guys rock.  Yes, definitely going to breadboard a bit in the future.  Yes, never going to install the board in the enclosure before thorough testing.  Learning a lot so far.

Onto the techy stuff...

Doing the audio probe thang.  I do NOT have signal after the first gain stage.  The second leg of Q1 has signal, albeit a tad quieter, but the third does not.  What does this mean?

[madbean]

This is what you are looking for.

[attachment deleted by admin]

[eldanko]

Thanks for the illustration!  Talk about customer service...

Ok - I double-checked the solder joints of Q1, and now I'm getting a signal on the 3rd leg, but it's incredibly weak.  Is something wrong with the transistor?

[madbean]

If you have extras, I would replace Q1-Q3 and see what happens.

Where did you get your transistors from?

[irmcdermott]

are people posting pictures in this thread? because I can't see any of them.... weird.

[eldanko]

Hey guys -

Sorry it's taken me so long to get back - out of the country last week.  Ok...

Bought my transistors from Pedal Parts Plus.  I've replace Q1 and still am not getting a signal on the 3rd leg of the transistor (speaking in order of signal flow).  Should I continue replacing Q2 and Q3 or address this problem first?

[jkokura]

Are you sure of your pinouts on your transistors? Double check that your orientation is correct not just to the image for the layout, but to the pinout on the layout.

I have used transistors with a backwards pinout to the normal pinout - sometimes companies use opposite pinouts for trannies compared to the same models from other companies.

Jacob

[eldanko]

Ok.  Resurrecting this thread because I'm STILL baffled.

I've socketed the transistors for easy switches.  I've tried both orientations and still haven't gotten any signal past Q1, even after replacing Q1-Q3.  I've tried two different batches of transistors.

Thoughts, friends?