King Nothing Low Volume

[Tassieviking]

I might as well post it here as well
I just tested a A-5413 DPDT ON-ON-ON switch from Tayda and traced the PCB with my multimeter, in the middle position the switch does nothing at all.
In the middle position the resistors are not shorted/bypassed to ground at all, when pointed towards the tube R19 47k is shorted/bypassed to earth and with the switch pointing to the gain pot R16 100k is shorted/bypassed to earth.
I am 99.9% sure a normal ON-OFF-ON switch could be used.

 

[Matopotato]

Thanks for checking.
Yes I agree that an on/off/on would do the same as a "type 2" on/on/on would.

But since it was important to get the proper one, I was suspecting a type 1 was called for since that would have mattered circuit wise.

More and more is pointing towards either type 2 or an on/off/on.

EDIT: Again, I got the types mixed up. It should be DPDT type 2 as per the Seymour Duncan picture in post 25
Type 2 matters. A type 1 would have the same effect as a on/off/on though...

 

[zgrav]

that makes me think the other kind of on-on-on switch should be used

 

[Matopotato]

that makes me think the other kind of on-on-on switch should be used

I got some feedback in another forum that the two locations control
More gain/less gain
Normal treble/less treble.
In total 4 combinations possible. (So 2x SPDT would cover all...) If you could have 3 of them, what would you have preferred?

 

[Tassieviking]

I worked out the LOW switch is a High Pass filter with frequencies at 68Hz 386Hz and 167Hz, the R11 C10 setup looks like a Low Pass filter to me, I worked out the frequency at 721Hz when C10 is connected to ground. (that seems wrong to me so I might have screwed up there)
I cant remember how to work out the gain for the JFET when C9 is shorted to ground, the medications I am on for pain makes it hard to concentrate most of the time, and I am never going to get better so I cant be bothered trying to get a grip on any spice programs at the moment.
These are good to use: (I often do)

High Pass Filter Calculator

This is a High Pass Filter. It calculates the range of high frequency signals that a filter passes through.

www.learningaboutelectronics.com

Low Pass Filter Calculator

This is a Low Pass Filter. It calculates the range of low frequency signals that a filter passes through.

www.learningaboutelectronics.com

Guitar Amp Circuit Design Calculators

www.ampbooks.com

Cheers
Mick

 

[Tassieviking]

that makes me think the other kind of on-on-on switch should be used

It does make you wonder, it would not be hard to run wires and use 2 switches SPST ON-OFF as there are really only an on/off function for both of those settings if separated.
High Gain on or off
Low Pass on or off
Now it is: High Gain no LP, Normal Gain no LP, Normal Gain LP on.
With the other type of switch the middle position would be: High Gain with Low Pass

From memory the gain should increase when the capacitor C9 is connected to ground, but that is an old memory from when I went to uni in the early 1980's to study EE.

 

[Matopotato]

Thanks a lot for putting all this effort in.
I am a little bit leaning on trying 2 spdt and figuring out what I prefer. I am cautious on open wires, breadboard etc etc on my first 250V build.
Itnis probably not 250 where I'll be messing, but still...
In another forum I got feedback that Low gain + LP on ("lower treble") likely is the least desired setting. But the DPDTs wiöl not let you escape that.
I tried mail Nathan of Sushi Box fx, but no response yet.
And just tried with Conspiracy to commit electronics as well.

 

[Matopotato]

I got reply from the designer at Conspiracy to commit electronics that is should be on/on/on "type2" as referred to earlier. And that is the one on the tayda link with 2-3 & 5-4 pins in middle.
Still not sure what the difference is from using on/off/on then in this case...

EDIT: All my fault, when I drew an initial pinout I mixed up my usual numbering and Tayda's into something that was mirrored in the end.
So it should be a Type 2, and then the pieces fall into place.

 

[Matopotato]

Sorry for me confusing things up. 1-2,5-6 pin setting (as with middle of a type1) would result in neither modes going anywhere, which is same as on/off/on middle pos.
So it makes sense with a type2 DPDT after all.