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Review 2 of 10
Price Paid:
$360.00
from Echohifi.com Summary: I brought my modified Dynaco ST-70 in the shop and switched between the two amps for about 15 minutes before I packed this amp n my car. It is in another class than the old Dynaco die-hard, and though I loved it while for a decade, I can't look back. The EH tubes in the system resulted in a softer top end, and replacing with Siemens EL-34 were the best results I've had. The EH EL-34 were brighter and possibly more dynamic, but the Siemens brought out the melody in the music. I could tell tube and equipment changes much more readily than the Dynaco. Make sure to bias the tubes correctly, not by ear, and the pot is extremely touchy. If it hums, check the zener diode and resistor on the output transformer which are the first to go in a tube failure. Compared to other amps, it performs extremely well for the price with slight lacking in dynamics, dimension, top end, bass punch. Note that this is in direct comparison and would be less noticable upon general listening. I upgraded to the AMC 2100as, and found the 2030A to have a softer and lighter sound with less detail and less revealing for better or worse. Overall, you can't lose with the relaxed and quieter EL34 sound. For the price it's a definite 5/5. For all the amps I've owned, this is an easy 4.5/5. Since super high end users won't be looking at amps in this cheaper range, I'm basing my ratings on that. Strengths: Inexpensive EL34 versus mt KT88 and 300B.
Quiet operation and quiet circuitry.
Very good balance of relaxed & harmonic tube rhythm with SS clarity & extention.
Excellent value. Weaknesses: - Possibly the hybrid design - sound very good but I'd love to hear a mod with full tube input, tube rectifier.
- No biasing meters, easy testpoints, and very touchy pots.
- Non-replacable cord - easy to fix.
- Somewhat restricted soundstage, ultimate dynamics and deep bass via design. Similar Products Used: 300B mono amps
AMC 2100as
Dynaco ST-70 with Welbourne labs FET front end and other mods
Hafler 9300 THX
ADCOM 535/555
Sherbourne
Proton/NAD
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