All four channel amps are working, but actual decoding of 70's 4 channel is unchecked as I have no sources. The AUX in has jacks for the front and rear. They could be driven with a "y" cord and drive 4 speakers that way. Great for stacked Advent speaker setups! It does have "A" and "B" speaker outputs of 4 channels each.The chassis was washed and exterior fully cleaned. The power supply/protection board and amp driver board were fully recapped with better than original electrolytics caps and speaker relays replaced with new ones. All crummy carbon compostion resistors in the amp were replaced with superior film types. There are no functional issues. All but two lamps replaced with the "stereo" one converted to LED. The dial lamps were converted from 8 volt to 6/6.3 volt types which are commonly available. The voltage was dropped to them is what I mean and new 6 volt bulbs used. The function lamps were converted to common 5 volt types. I will include bulb source info and an extra 5 volt bulb along with the original rubber dial bulb holders. Sorry, no 6 volt dial bulbs left! The dial lettering that looks blue actually has more of a greenish cast to it (actually appears aqua). Dial pointer is red. Very cool 70's look! All switches, pushbutton and rotary as well as the pots were all cleaned/deoxidized and are now quiet. Possibly the speaker switches will act noisy again at some time, they are almost 40 years old. Amp adjustments were all done and AM/FM alignment done. I could not do the 4 channel adjustments as I didn't have the required test record or a generator. The faceplate is very clean with the usual assortment of scratches on the top edge. There's some scraping at the bottom edge of the plastic window. I retouched the lettering the best I could. The bezel inner black area was repainted and the silver edge touched up. There are fake wood side panels which have some peeling vinyl and chips out of the top. It looks better off without them! I will only ship them upon request with the longer original screws. The steel cover is held on with new black oxide screws. Other photos are available upon request (include e-mail address) with requested view. The sides and bottom are in excellent condition. Comes with check off sheets and basic performance specs and what was done. Power output was verified at 61/62 watts into 8 ohms at rated distortion (0.5%). The manufacturer's rating is 44 watts per channel (2 channel mode). Please Due to the nature of vintage electronics item is sold "as is" with the exception of guaranteed not DOA. A $8 handling fee is added for a brand new double thick box and solid styrofoam protection. Also it is to allow for under calculated shipping and for UPS insurance. I pack well, check my feedback ratings and comments. If the $8 doesn’t cover it I will inform you. After the real amount is known I will refund any amount if it’s over $1 and ask for any shortage if it’s over $1. By bidding, you agree with this. Please note: Item ships only to the United States, even if you have PayPal & a 100% rating. PLEASE DON’T ASK! I would like to hear from the winning bidder within 3 days and be paid within 7. After that a non-pay claim will be filed.