Thanks for your input guys! I’ve never listened to a separate CD/DAC and wondered if there would be any benefit in going that route. I get the impression that the difference wouldn’t justify the expense so for the meantime I’m staying with the Marantz.
elwappo99: Yes, the Marantz looks very much like the one shown. I wanted a unit that had excellent sound and this was the one recommended.
jmsaxon69: I honestly don’t know which screen is in my 650’s. I purchased them around four or five years ago. When did Sennheiser make the switch from black to silver? I gather there must be a difference in sound between the two? I’ll have to do some research into this.
Overall I’m very happy with the sound from this combination. Jason & Mike make a killer amp for $350! Replacing the driver tubes with the 1964 Novosibirsk set improved the resolution and detail I was getting from the stock 6N1P’s which was already very good. It’s possible that they may be a little too intense if that makes any sense. I’ll live with a little brashness if that’s the price to pay for the level of detail and transparency I’m getting with the older tubes. I also found that swapping the stock output tubes with the 1963 Foton 6N6P’s gave a slightly improved bass response without making the amp sound stodgy or slow.
I’ve got another set of driver & output tubes I purchased from Mr.Tom that are of a slightly newer vintage. I haven’t listened to them yet so I’ll stick ‘em in and see how they fare. This may be the best I’m going to get with this system and it’s a vast improvement over my 30 year old Carver C-1. I think I’m going to retire the old boy and upgrade to a Woo WA2 for my main system. The Valhalla is currently in my bedroom system.
Tubes all the way!