Hi paul,
Can you tell me which potentiometer is used for the distortion (which is on the far right)?
That Potentiometer is scratching a bit with me. Maybe I like to replace it.
Is it "Logarithmic" or "Linear"? Please, can you tell me the resistance value, the shaft-height in mm, the type (pin count, identification/product/model number)?
thank you.
Greetings,
rio
Hi,
The spec is: 10k, linear, 6mm diameter, D shape, 25mm height.
I think Bourns and Alps both make one.
Possibly worth a bit of contact cleaner first?
ok thx.
greetings,
rio
I think ALPS RK09D1130C2P should fit.
The 6 potentiometer at the top are all the same, right?
What are the "values/parameter" for the volume and boost potentiometers?
Greetings, rio
oh - no 3 of them are different. You'll see they are bigger. Here's the part: Alps RK12L12C0A0E
The bass boost pot is 1k: Bourns PTV09A-1025F-B102
Rest are 10 k.
ok, it looks like they are: "Cutoff", "Reso", "Filter LFO":
(http://4.bp.blogspot.com/-TBsth_9TI7s/UuDvYiX-5YI/AAAAAAAAAJg/DDaCePIyZdU/s1600/atmega+pcb.jpg)
1. So can I use "Alps RK12L12C0A0E" as a replacement? - they have 15A taper -> they are logarithmic - Are you sure? I ask, because the 3 others are linear.
2. For the boost poti: I don't find Bourns PTV09A-1025F-B102 --> only PTV09A-4225F-B102 (can I take these as replacement therefor?)
they are linear, right?
PS: With that middle number 1025F, I can only find these "logarithmic" ones: "PTV09A-1025F-A203" <--- but these are not the right ones, right?
Please, I need more details about these both potentiometer types...
Greetings,
rio
1) Yes these 3 are definitely logarithmic. The others are linear
2) The codes are explained in the datasheet: https://www.mouser.co.uk/datasheet/2/54/tv09-777818.pdf (https://www.mouser.co.uk/datasheet/2/54/tv09-777818.pdf)
The 4 in "4225F" means that there is no sleeve to the pot, so it will wobble (some early units actually have this type, because I could not get stock of the other type)
The first 2 in "4225F" means that there is a centre detent. There isn't any need for a centre detent with any of the pots. You use a detent when middle = 0 (but the Atmegatron only uses anti-clockwise = 0).
So technically and electrically PTV09A-4225F-B102 is fine, by you may find the differences annoying!
PTV09A-1025F-A203 will not fit the logarithmic pot holes. They must be "dual gang" with 6 pins.
ok thanks, for your great explanation...