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Cary rocket 88 vs dynaco st70

I currently have a completely rebuilt and upgraded dynaco st70 that sounds very nice in my system.

Classe dr6 pre
Quad 11L monitors
Denon dvd/sacd

I am having some low level hum from my dynaco, and am considering a used Cary rocket 88.
If you have a rocket 88,how quiet are they,and would this be an overall sound quality upgrade over the dynaco?
Speakers are 6ohm, 86db and have plenty of volume with the dynaco.

I had a pair of 96db klipsch kg4 in the system and the hum was unbearable.

There are no groundloop issues since my bryston 3b at has no hum in the system.
????
dave
dav65mus

Showing 4 responses by rodman99999

rodman99999
6,206 posts
 
A bad power supply filter cap(in any electronic component) can cause a variety of noises. Could that be what you're thinking of?
rodman99999
6,206 posts
 
Output capacitors? What are those? I've owned both amps. Had no noise from either, at all. Over the years I had upgraded the coupling caps, multi-section cap(which could be your issue), and added some capacitance to the B+ supply(plus a few other mods). The Rocket 88 was still an improvement, especially in triode mode. If you move to the Cary; you won't regret it. BTW- Try flipping the Dynaco's plug over in your wall outlet. If it's still stock; the prongs should be the same size.
rodman99999
6,206 posts
 
Calbrs03- The two first ones are power supply filter caps. The other is a resistor.
rodman99999
6,206 posts
 
Dave- Like I said: I've owned both amps, and the last ST-70, from stock to rod-rodded(16 years). You won't miss your ST-70, once you've tried the Rocket 88 in triode mode(especially with some NOS inverter/driver tubes).
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