Transformer Based 6db preamp.

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happyrabbit

Transformer Based 6db preamp.
« on: 4 Jul 2020, 03:25 pm »
My latest diy preamp adventure. -/+ 24v Linear Supply. Sparkoslabs regulators. LSK489 for the jfet’s.  6 layer PCB (s/g/p/p/g/s). Startup / shutdown muting.

Balanced -> LL1676(1:2) -> jfet follower -> 10k ladder -> jfet follower ->  dc blocking cap -> RCA

I will post measurements soon..  the in/out are flipped on the case.  :duh:











happyrabbit

Re: Transformer Based 6db preamp.
« Reply #1 on: 16 Sep 2020, 01:36 am »
Round 2..   more filtering on the linear supply.   Different output coupling caps.   Removed jfet buffer vreg’s and replaced with low pass filters.   Replaced Khozmo attenuator with the mini from Tortuga Audio. 




FullRangeMan

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Re: Transformer Based 6db preamp.
« Reply #2 on: 16 Sep 2020, 02:43 am »
Nice preamp, any idea on the gain or freq range?