Dynaco PAS-4 Tube Preamp and Stereo 400 Series II Solid State Amp Combo

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Gorgeous "almost vintage" combination tube and solid state amplifier from Dynaco.

Incredible construction and attention to detail make these a match made in heaven - that’s why we are listing them together. I’m a big fan of using tubes for the preamp and solid state for the amplifier to get just the right touch of warmth into a well performing speaker.

The preamp features a handy external processor loop and a nice phono section to get the most out of your turntable. The sleek glossy and matte black finish on the faceplates are truly striking and a fresh departure from the typical black or silver.

Inside you’ll find high quality components including sealed pots and film capacitors in the signal path that will last forever. The layout and attention to detail really stands out.

The units are in perfect working condition and the tubes test strong and clean. We ran the amp on our workbench to its full rated power and it measured clean. It was also tested in our listening room for some time to ensure that all the fine details the test equipment reported translated to good quality audio.

The faceplates are super clean and scratch free as you can see from the pictures. The tops have a few scuffs, but nothing really worth noting.

Click here for a PDF copy of the PAS-4 Owner's Manual

PAS-4 Specifications
Phono Section
GAIN:
40 dB

RIAA ACCURACY:
+/- .5 dB from 20 Hz to 20 kHz 500mV RMS @ 1kHz

PHONO OVERLOAD:
500mV RMS @ 1kHz

MAXIMUM OUTPUT CAPABILITY:
60V RMS @ 1kHz

THD:
50V RMS @ 20kHz (for 1% THD)
less than .025% @ 2V RMS Output

INPUT IMPEDANCE:
47k shunted by 10pF

TAPE OUTPUT IMPEDANCE:
2k

NOISE:
-86 dB below 10mV RMS Input

ABSOLUTE PHASE:
Non-Inverting

TUBE COMPLEMENT:
2ea 6DJ8 (6922); 2ea 12AX7 (ECC83)

Line Section
GAIN:
8.5 dB

FREQUENCY RESPONSE:
2 Hz to 150 kHz (nominal)
(-3 dB, 20 k ohm load)

MAXIMUM OUTPUT:
40V RMS (for 1% THD)

THD:
.025% @ 2V RMS Output

INPUT IMPEDANCE:
25k nominal (all inputs)

OUTPUT IMPEDANCE:
40 ohms

NOISE:
-90 dB below 2V RMS Output

ABSOLUTE PHASE:
Inverting

SLEW RATE:
40 V/μs

TUBE COMPLEMENT:
2ea 6DJ8 (6922)

Electrical / Mechanical

POWER REQUIREMENTS:
100, 115, or 230 VAC @ 50/60 Hz

POWER CONSUMPTION:
45 Watts

DIMENSIONS:
17" Wide, 3.75" High, 12" Deep

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.