35 year old joy

Very nice, I used Mono Blocks for years, mine had manual volume controls, yours are simply ON/OFF. I wanted Remote Volume, and Remote Balance, so I used one of these

https://www.ebay.com/itm/397116384613?mkrid=711-53200-19255-0&campid=5338381866&toolid=10001&customid=380e7e76-d840-11f0-81d0-653130323763

New, open box, with remote, that's a good price. You must have the remote, there are no controls on the unit.

It is totally invisible audibly, no one has ever been able to tell if it is in or out of my system. 

A slight refinement of balance can make a surprisingly large improvement to imaging on the occasional errant tracks. Once you have remote balance, you will never want to live without it.

@elliottbnewcombjr Thank you for the recommendation.  I am a little old school with a ARC SP9 MK II preamp which was also rebuilt.  I need to put the rest of my system in AGON  to help those like you helping me.  Thank you again as I have seen you make many good recommendations on the forum to many audiophiles.

well, that preamp, you can use one of the tape loops for the optional use of the Remote Line Controller, that is one way to prove it is sonically invisible. 

@elliottbnewcombjr

Still a good idea as there are good old tape loops available.  Will be taking a look.  Thank you.

have you seen this discussion about old gear?

https://forum.audiogon.com/discussions/your-oldest-gear

and this older one

https://forum.audiogon.com/discussions/is-there-any-one-piece-of-vintage-gear-you-most-wished-you-owned