Rangemaster

[petesguitar1]

Hey folks - really happy with my Blue Clippers - loving them but would love to mellow out the distorion a bit - any ideas - it's on a PCB so I'm wondering how I put a cap around the diodes (saw it in the simple mods)

I've also built a rangemaster, but alas - the volume is so low I have to turn my amp up flat out to hear it. Bypassing works so i'm pretty sure it's on the board.

Resistors

R1
R2 0 - 0
R3 8.58 - 0
R4
R5 8.56 - 8.56
R6 8.56 - 8.56
R7 0.07 - 0.07 - 0 Turned full, 0 is ground
R8 0.01 - 0

Caps

C1 8.56 - 0
C2 8.46 - 0
C3
C4 8.38 - 8.38
C5 0.07 - 0.01

Trans

8.43 - 0.11 - 8.47

I have checked all my solders and resoldered all suspects.

Any help as usual, is much appreciated

Thanks dudes

Pete

[vanhansen]

What readings are these for?  The Rangemaster? (I'm assuming they are)
Which Rangemaster schematic did you use?
Which Transistor?  And is it NPN or PNP?

At first glance the voltage on the tranistor, assuming the 8.43 or 8.47 is the collector, is high.  It should be around the 7 volt range.

More details as to what goes with what would help.  It's hard to tell not knowing what parts those readings go with.

[petesguitar1]

Yeah, these are for the Rangemaster. I used a schematic from Tonepad and a PCB from there. I'm using a Germanium PNP (Hitachi 2SB77). I bought it from small bear and it was tested specifiacally for the Rangemaster (apparently). The 8.43 volts is for the collector. I don't know how to distinguish the Base and Emitter - wiki is complicated for me!

[johngreene]

The emitter is the leg with the arrow. The base is between the emitter and collector. The bias on the base doesn't look right. The transistor is basically 'off'. You should have 8.85V on one side of R5 and around 8.2V on the other (base) side.

--john

[tiges_ tendres]

Yeah, these are for the Rangemaster. I used a schematic from Tonepad and a PCB from there. I'm using a Germanium PNP (Hitachi 2SB77). I bought it from small bear and it was tested specifiacally for the Rangemaster (apparently). The 8.43 volts is for the collector. I don't know how to distinguish the Base and Emitter - wiki is complicated for me!

when you get your trannies from small bear, they tell you what resistors you should use to get the right voltages, these dont always match with what it says on the tone pad schematic.

That should help some, also confirm your pin out

[petesguitar1]

Thanks for the advice. I think I've got some big problems. I put in all the parts for the mill bypass to see if that would alleviate any problems, but now I'm getting some really weird voltages that are constantly moving. I don't know what to do. I had the collector wrong before, now it's reading

Emitter - 5.8--6.4
Base - 5.8--6.4
Collector --- 0

Hmmm...

[vanhansen]

That the mill bypass stuff out.  We need to get the circuit working as-is first, which means biased properly and giving the proper output levels.

The base of the transistor is where R4 goes in to.  The collector is actually connected to R7 since this is a PNP transistor.  The emittor is connected to +9V.



It's obvious that the biasing is off.  Did you use the exact values as in the schematic on Tonepad? 
BTW, I just figured out that your part number readings correspond to the part numbers on the Tonepad schematic.    It's been a long day.