Low Noise Transistors: Comparing the ZTX1053A and ZDT1053 (Dual) vs. the ZTX689B and ZTX851

Where we discuss new analog design ideas for Pro Audio and modern spins on vintage ones.
User avatar
mediatechnology
Posts: 4274
Joined: Sat Aug 11, 2007 2:34 pm
Location: Oak Cliff, Texas
Contact:

Re: Low Noise Transistors: Comparing the ZTX1053A and ZDT1053 (Dual) vs. the ZTX689B and ZTX851

Post by mediatechnology » Fri Apr 10, 2020 7:13 am

terkio wrote:
Tue Apr 07, 2020 8:04 pm
What I have in mind is using a matching gig where I insert a resistor in the transitor base to represent the bias resistor that will be used in the final circuit.
There's a lot to be said for simply using the preamp itself as a test circuit which includes the bias resistors.

I would suggest that approach in the MC preamp instructions but it would require socketing the input transistors.
Since I'm not crazy about leaving the sockets in for the final build I suggested testing Vos out of circuit.

Post Reply