Ampeg Portaflex Series User Manual

13
PF-20T / PF-50T Bass Guitar Amplifier
PF-50T Technical Specications & Block Diagram
Preamp All-tube 2 x 12AX7
Power Amp All-tube 1 x 12AU7, 2 x 6L6
Output Power Rating 50 Watts @ 8 Ω, 10% THD
50 Watts @ 4 Ω, 10% THD
Signal to Noise Ratio 60 dB (20 Hz–20 kHz, unweighted)
Maximum Gain Input: 66 dB
Tone Controls Bass: +10/–10 dB @ 60 Hz
Midrange: +5/–20 dB @ 200 Hz, 400 Hz, 800 Hz
+5/–15 dB @ 1.6 kHz, 3 kHz
Treble: +13/–23 dB @ 4 kHz
Ultra Lo: +2 dB @ 50 Hz, –10 dB @ 500 Hz
Ultra Hi: +5 dB @ 8 kHz
Power Requirements 120VAC, 60 Hz, 90W
100VAC, 50-60 Hz, 90W
220-240VAC, 50-60 Hz, 90W
Size (H x W x D) 7.3 in x 13.9 in x 10.4 in
185 mm x 353 mm x 264 mm
Weight 19.4 lb / 8.8 kg (approximately)
12AX7
12AX7
-15dB INPUT
0dB INPUT
GAIN
BASS TREBLE
MID
MASTER
12AX7
12AU7
12AX7
12AU7
6L6GC
6L6GC
8 OHM
SPEAKER
OUTPUT 50W
PF-50T
ULTRA
LO
ULTRA
HI
MID
SELECT
PRE/POST
TRANSFORMER
LINE OUT
4 OHM
BALANCED
LINE OUT
GROUND LIFT
GROUND LIFT

Ampeg Portaflex Series Specifications

General

Series	Portaflex
Type	Bass Amplifier
Power Output	Varies by model (e.g., 350W, 500W, 800W)
Speaker Configuration	Varies by model (e.g., 1x15", 2x10", 4x10")
Tube Preamp	Yes (on some models)
Solid State Power Amp	Yes (on some models)
EQ	Varies by model. Typically 3-band EQ (Bass, Mid, Treble). Some models have additional EQ controls.
Inputs	1 x Instrument
Outputs	Varies by model
Impedance	Varies by model (e.g., 4 ohms, 8 ohms)
Weight	Varies by model (e.g., 35 lbs, 65 lbs)
Dimensions	Varies by model
Tone Controls	Bass, Mid, Treble