All-tube preamp with DI, hand-built with custom components.
The Manley 40MP all-tube Mono microphone preamplifier is primarily intended for use with modern condenser
microphones. 40 to 60dB gain, enough for most ribbon mics, is selectable in precise 5dB steps by varying the amount of overall
negative feedback on the Gain switch. This is a very interesting feature indeed, allowing you to change the slew rate (speed),
placement, and tonal balance of the sound from mellow and "tubey-er" through to faster, punchier, and more aggressive.
complements include a 1 x 12AX7EH hand-selected for lowest noise, and 1 x 6414 for each high-current output stage. Each Manley
40MP Mono Tube Preamp is painstakingly hand-wired using silver solder and audiophile-grade components. Double-shielded custom-built
power transformers and custom-built high-capacity reservoir capacitors demonstrate Manley's modern power supply design approach.
When you need to get your tunes through some tubes before hitting a sterile digital recorder, the front panel 1/4"
DI jack lets the Manley Mono Microphone Preamp serve double duty as a pure tube line stage for instruments such as bass, drum
machines, and keyboards. Total gain in this mode becomes 20dB less than indicated on the Gain switch. Both transformer-coupled
balanced, and direct (via humongous metalized film MultiCaps) capacitor-coupled unbalanced outputs are provided, giving you
the choice of audiophile/purist or big iron sounds. Perennial shoot-out winners, Manley single-ended preamp designs have become
favorites among top engineers and home recordists who are looking for "that rich Manley sound with the tight bass and the
top end that goes on forever," that begs to go direct to tape. It's a BIG sounding micpre!
so cool about variable Feedback?
Global negative feedback takes a small portion of the output signal and re-injects it back into the input stage,
which greatly improves linearity and distortion performance of an amplifier. A tasteful amount of negative feedback is the
key: too much and you're into poor transient response and phase shift problems. Manley generally uses somewhere between 4
to 14dB of feedback in their line preamplifiers. Within that window is a definite point of maximized stability with optimum
sonic performance, giving you the choice of where you want to be. Changing the amount of feedback alters the overall gain
of the amplifier as well as the slew rate (speed).
In the context of a hifi amplifier or preamplifier with the Variable
Feedback feature, EveAnna (Manley) uses variable feedback to suit different CD's and recording styles when she's listening
to music at home. "For the most part I keep the variable feedback controls around the middle but sometimes when I'm playing
a CD which is kind of harsh and aggressive sounding or I just want to mellow out, I just turn those control down and apply
more feedback to get a smoother, richer texture. But when I'm the one in the aggressive mood, I crank 'em up for a faster,
punchier sound. The bass gets tighter and the top end sizzles. Vocal placement; is more forward. And, oh yeah, it gets louder
The "GAIN" switch on the pro studio Manley Mono Mic Pre, as well in the mic preamp section of the Manley VOXBOX
is actually a variable feedback switch offering a range of 20dBs of global negative feedback in five settings of 5dB steps
to alter how much variable feedback is applied around the tube circuit. This GAIN switch can be used in the higher 55 and
60dB settings (in conjunction with turning up the Input Attenuator) to achieve maximum amplification for quiet singers or
lower output ribbon mics. With most "normal" condenser mics and applications, the GAIN switch setting can be chosen at will
for sonic variety for a "more tube-y" sound in the lower 40 or 45dB settings, straightforward sounding middle positions, or
more aggressive punchy sounds in the higher gain positions. There is no right or wrong with this switch. Have fun playing
around with the Manley tube mic preamplifier—it will bring you some interesting results.
Manley 40MP Mono Mic Tube Preamp Features:
- Manley input & output transformers with nickel laminations in mu-metal cases
- Flat frequency response from 10Hz-60KHz
- Mic input Phase Reverse switch
- 48V phantom power
- Hi-Z (100k ohm) ¼" Direct Input
- Noiseless conductive plastic Input attenuators
- Adjustable FEEDBACK / GAIN switch selects 5dB steps between 40 to 60dB of gain
- Hi-current drive <50 ohm Lo-Z 1/4" and XLR outputs
- Auto Mute with warm-up delay for power up/down
You most important tracks deserve the Manley Mono Mic Preamp.
Manley 40MP Mono Mic Tube Preamp Specifications:
- 2400 ohm mic input impedance
- <0.05% THD @ 1Khz S/N ratio: 80dB
- EIN: -125dB
- Max. input (with input pad fully open): 450mV
- Max. output: +32dBu
- Max. output (into 600 ohm load): (+15dBm)
- Power consumption: 18 watts; Mains Voltage Frequency: 50 – 60Hz
- Dimensions: 19" x 1-¾" x 10" (occupies 1 rack space)
- Shipping Weight: 12 lb.