Simplex Vintage Mic Pre


The Simplex Vintage is a high quality microphone and instrument octal tube preamp with pure and transparent triple gain stage class A design
featuring Input and Output transformers handwound by Jensen.

Providing a natural sound experience with a relaxed, warm and sweet sound stage
delivered by the lively responsive and wide frequency range of Octal Tubes.

A microphone preamp is arguably the most important sound generating device in any recording setup.
It comes right after the weak signal from a microphone or instrument pickup and boosts it to recording line level.
Without a fine quality preamp, music and sound quality is lost right in the beginning of a recording signal chain
and even excellent effects and mixing consoles can't recover and infuse the sound with it's original pure quality.
The Octal Tubes in the Simplex Vintage enhance that quality with their unique, lively and musical character.

Triple gain stage class A Octal NOS tubes

Super-quiet power and dc-filament supply

Tube rectifier

Jensen nickel-core transformer

Variable input impedance

XLR gold pin connectors

Point-to-Point wiring

Carbon Composition resistors

Hermetically sealed mil-spec paper/oil caps

5-band EQ

Carling heavy-duty switches

Fast and no-loss lighted VU meter

Read the Simplex Vintage Manual



Rear Connectors:

Rear Control:

Front Connector:

Front Controls:

Voltage Gain (continuous):

Input Impedance:

Output Impedance:

Maximum Output Level:

Frequency Response:

VU Meter calibration:


Triple gain stage class A Octal tube
6SJ7 Pentode, 6SL7 Dual-Triode, 6SN7 Cascode, 5V4G Rectifier

Microphone Input XLR Transformer Balanced
Output XLR and TRS Transformer Balanced (TS Unbalanced)

Power On/Off
Ground Lift switch for Pin 1

Instrument Input 1/4" Unbalanced

48V Phantom Power On/Off switch with LED
-20dB/0dB Pad switch
+/- Polarity switch
Input Control for Impedance and Sensitivity
Gain Control
Level Control
EQ/Bypass Toggle
5-band EQ: 40, 200, 800, 2500, 10000 Hz
Output Control for Headroom

Microphone 110 dB
Instrument 90 dB

Microphone: Variable sweep 0 to 10K Ω
Ribbon Mic: Variable sweep 10K to 30K Ω
Instrument: Variable sweep 0 to 500K Ω

600 Ω

+23 dBu

20 Hz to 20 kHz

+4 dBu/1.228 Vac at 0 dB/100%

12 x 8 x 3 inches

Handmade in USA

100/120/220/240VAC (50/60Hz)

Input transformer data

Output transformer data

Sound Samples:

I upgraded a large diaphragm condenser tube mic with a subminiature tube, Neumann U47 replacement capsule, paper/oil cpacitors and Jensen transformer.

The guitar is this Acoustic Archtop
This clip is raw and without any effects.

Acoustic Guitar Demo