When did the KOT switch to 1N4148's?

BeeSharp

BeeSharp

Active member
I was looking at my King of Tone from 2020 (and the one I had from 2016) as a reference when building my Paragon and I noticed that it has 4148's and MA858's (I think - double yellow stripe). I don't think I've heard of this before.
 
I did read somewhere that he users 1N914’s in lieu of the 1S1588’s. Pretty close performance-wise I guess.
 
On the ones I've had the 4148's replace the 1S1588s and the MA856 are replaced with MA858 (I think - double yellow)
 
OK, I've measured the 1S1588 and MA856's to both be around 0.68V on my dca55. The 4148 were 0.69. So yeah pretty close. Is that the only thing that effects the sound of a diode besides the circuit it's in?
 
fluke 179 ... 1s1588 and 1n4148 came in at .59V and ma856 came in at .75V ...

in this particular circuit the 6k8 resistor is also a decision maker regarding the diode clipping in the feedback loop. you can change that resistor value to make 1n4148 behave similar to the higher Vf ma856
 
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thesmokingman said:
fluke 179 ... 1s1588 and 1n4148 came in at .59V and ma856 came in at .75V ...

in this particular circuit the 6k8 resistor is also a decision maker regarding the diode clipping in the feedback loop. you can change that resistor value to make 1n4148 behave similar to the higher Vf ma856
Click to expand...
As Ross, I'd love to know which value you would suggest and in which position if possible. Sorry for the thread resurrection!
 
Big Monk said:
I wouldn’t sweat the minutia too much. The stock circuit with 1N914 and 1N4148 is a killer.

A real, true kick-ass double overdrive. I’d be more concerned about tweaking the treble trimmer caps rather than trying to match volt for volt on Vf.
Click to expand...
That's great to know!
Just confirming,
1N4148 in the place of the 1s1588
and
1N914 in the place of the MA856?
 
Ariel said:
That's great to know!
Just confirming,
1N4148 in the place of the 1s1588
and
1N914 in the place of the MA856?
Click to expand...
I'll have to check, but I used something with a bit higher vf for the MA856 last one I built MA856 is closer to .71-.76
 
Pretty sure that the H painted on both the chip and the big cap are to designate helicopter landing zones. It further illustrates how special the King of Tone is.
 
Along with what Chuck said a year ago.. I don’t like the way that electrolytic is bent (middle left above the trimmer). Those bends right at the bottom of the cap like that can compromise the seal. Should’ve used pliers or something to put some distance on the bends and less stress on the seal.

Also that pad for C2 (bottom right) looks a little thirsty.

Maybe nit-picky, but they could’ve cleaned the flux off the joints for the pots and stuff. I hope they at least cleaned the underside… I mean for what it costs and how long it takes to get one new, I feel like it should present itself a little better on the inside.
 
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