Cool!!!I biased the prototype 100% by ear, never even broke out the DMM....
I just adjusted the trims back and forth one at a time and listened for the most full and open sound.
Just curious, did you get your NE5532 from Tayda?
Yeah I love Tayda...Was just curious, mine crackled and popped like crazy. Swapped it out with a TL072 and it cleared right up.
Wasn't sure if it was just a bad opamp (if so it'll be the first defective part I've ever gotten from Tayda) or if it wasn't a legit part.
Probably was just a defect.... After hundreds of thousands of parts ordered over the years for pennies, I can't really complain about one bad opamp.
I still haven’t tried one of those gold ones...Beautiful! Gloss black box is very classy. If it sounds good, you biased it right. It that a "gold" switch from BLMS? I picked up a few on my last order. Now for the $64,000 question:
Does it make you sound like Paul Gilbert?
With that Powder Coat, It just squeezes in!This one sounds pretty cool...
Not sure if I biased it right...
Just did 4.5v on all of em...
sounds pretty good...
Thanks manWith that Powder Coat, It just squeezes in!
Are they NOS J201's ?
Very Tidy Build!
Thanks Mike!¡Picture perfect !
Looks awesome KP
Mike
Just curious, did you get your NE5532 from Tayda?
I biased mine a little under 9V, I'll have to try the 11.11If anyone else is building one, I'd recommend trying out biasing using RunOffGroove 'Triode Emulation' formula.
A closer look at the Fetzer Valve
View attachment 3697
Vcc is supply voltage -- The 1044 puts the supply voltage (from a typical 1-spot supply) up to 17.55.
Vp is the pinchoff voltage of the JFET -- RoG measured a handful of J201's and found the average to be -0.83v.
So in most cases, the drain-voltage (Vd) to give the J201's the most 'tube-like' distribution of harmonics would be 11.11v. JHS probably biases right at Vd=0.5*Vss (9v) like in the Superbolt, but this just sounds sweeter, albeit a little lower gain.