Favoring MicParts, when I was brand new to DIY, they offered a lot of confidence. I think you could even send him your almost-working devices to fix!
And they were the first place I saw detailed discussions of what the differences were between the capsules they sold.
One of the capsules I got for the MP MXL 990xf upgrade was an RK67 “D” they were selling for this build, which evolved into other later RK67e’s they sold. So they are doing QC in the sense of trying to improve some aspect to the product.
I suspect the weaknesses of the RK67d’s were less apparent with the transformer based circuit.
And they were the first place I saw detailed discussions of what the differences were between the capsules they sold.
One of the capsules I got for the MP MXL 990xf upgrade was an RK67 “D” they were selling for this build, which evolved into other later RK67e’s they sold. So they are doing QC in the sense of trying to improve some aspect to the product.
I suspect the weaknesses of the RK67d’s were less apparent with the transformer based circuit.