Pre-Amplifiers
An analog voltage amplifier for adjusting the volume and selecting of inputs and outputs to the power amplifier(s). In some cases, shaping the sound scape.
C310
User switchable paper in oil and high slew rate capacitor line stage preamp
3 line level inputs, one of the inputs is a SE/BAL combo. With optional balanced and up to 5 inputs
Headphone jack, SP Capacitor jack for user "plug and play" future upgrade
Click here for additional pictures of C310 Line Stage Preamplifier and its variations
George Taylor of Entracte Audio (our Toronto, Ontario dealer) explains the features on C310 pre-amplifier
C312
Tube Simulator and Solid-State all in the signal path
User selectable and variable for each signal path
3SE and 2 SE/BAL inputs
Standard remote for Master Volume only.
Optional remote to control all four adjustment dials. Including Warm, Tube S, SS and Master Volume.
SP Capacitor jack for "plug and play" future upgrade
Click here for additional pictures of C312 Preamp with GC312 Power supply
Shown standard configuration with one pair of balanced output.
George Taylor of Entracte Audio (our Toronto, Ontario dealer) explains the unique features on C312 pre-amplifier.
This video explains how to use the three adjustable knobs. The Warm, Tube S and SS.
The above image was from the video How to use C312 preamp seasoning knobs. Someone has asked what's the logic behind the tube sound if it doesn't have tube inside. George Taylor of Entracte Audio answer with a brief history of the C312 and how it came about. Here is his reply to the question on June 18, 2025.
@EntracteAudio To answer that, we have to go back a few years... about a decade ago (give or take) Angela-Gilbert came up with preamp called the BC307. That was an all tube preamp that allowed the ability to mix two tube gain stages and a solid state gain stage. the latest iteration of that preamp is called the BC318. However, tube preamps can be fussy and noisy, and their power supplies can be complex and expensive to build, so Angela-Gilbert built an integrated amplifier (NFS238) that had an adjustable simulated tube stage, and an adjustable solid state gain stage. The tube simulation circuit in the NFS238 worked really well. The C312 is essentially the preamp section of the NFS238, with adjustable Warm, Tube, and Solid State gain stages.
The "logic" as you put it is in the ability to adjust these gain stages so that the use can control how much tube sound they want, what flavour of tube sound they want, and how much solid state sound that they want. It's an effective way dial in a specific tone profile that works best for a system. The added bonus is that you don't have to worry about tube longevity and tube consistency.
C318
With 6SN7, 6922 and Solid-State all in the signal path
User selectable and variable for each signal path
3SE and 2 SE/BAL inputs
SP Capacitor jack and FCF 200V B+ jack for "plug and play" future upgrade
Separate tube and solid-state power switch to save tube life
Click here for additional pictures of C318 User adjustable hybrid parallel line stage preamplifier
Mike Woodcock of Absolute Sound (our Chatham, Ontario dealer) explains the unique features on C318 pre-amplifier.