using a preamp with an integrated amp

I recently purchased an integrated amp it is a:
YAQIN MC-10L EL34 Class A Integrated Tube Amplifier SV

Specifications
Input Power 110V-240V AVAILABLE
Output Power 52W x 2 "8 ohm"
Valve / Tubes 4 x EL34B
Frequency 20Hz-60kHz "±1.5dB 10W"
Lose true degree 2% "40W"
Signal/Noise Ratio 85dB "A Weight"
Load impedance 8ohm or 4ohm
Signal Inputs Level 300mv
Input Consumption 250w
Input Jack 4 groups
Size Dimension W 470mm x H 310mm x D 180mm
Colour Silver Body & Black Power Supply
Weight 22kg
Packing Includes All Tubes, 1.5m Power Cord & Hex Key

I am replacing my Dynakit ST-70 with it. It has four inputs and the only controls are a volume, on/off and a selector for the four inputs. I have a DYNAKIT PAS3 and I am wondering about using it as one of the four inputs. Four inputs are just not enought for me, three turntables, CD, DVD, AM/FM, two reel to reels, a cassette recorder and an output to my computer for turning my vynil into CD's.
Am I asking for trouble putting a preamp into an integrated amp's input?
Should I just fix my ST-70 and stay with it?
I am really new to all of this, as I have been using a FISHER 800C for many years and just sold it this year and thought I would try something new.
Any help would be appreciated.
Thanks,
Michael

No problem, assuming that the line-level input impedance on the Yaqin is correct for your PAS; or that your PAS can be modified per Dynaco's instructions to match it.

That specification is not shown on your original post, however. Perhaps the importer of the Yaqin can provide it.