I have two LL1636 left over from a preamp rebuild. First I thought I should put one of them in my Electro Harmonix 12ay7 Mic Preamp, but after some thought I have decided to build a stereo preamp from scratch using both of the transformers and put the build in a 19 inch rack using the circuit from the EH preamp. I'm gonna use the circuit of the EH 12AY7 preamp as inspiration, or more exactly, I will mostly clone it, but I'll make at least two changes. I will move the gain from before the first tube stage, and put it between the 12AY7 and the 12AU7 tube, and I will also put a master volume/attenuator after the 12AU7 tube. Otherwise i will mostly use the EH circuit as it is, first tube stage is fixed at 50db of gain, with the LL1636 in 5:1 configuration in front of it. The circuit will then have a total of 63dB gain.
I need some help before ordering parts.
Whats the smartest way to implement the attenuators between and after the respective tube stages (... the “gain and master” pots)?
Could I use an H-pad design?
... I know, the build will have some obvious similarities with another well known tube preamp...
I need some help before ordering parts.
Whats the smartest way to implement the attenuators between and after the respective tube stages (... the “gain and master” pots)?
Could I use an H-pad design?
... I know, the build will have some obvious similarities with another well known tube preamp...
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