EXPIRED: Dynaco VTA ST-120 Valve Amplifier

Billyham · January 20, 2020

Item: Dynaco VTA ST-120 Valve Amplifier
Location: Sydney 2076
Price: $2,450 Firm
Item Condition: Brand New, one week after assemled and tested
Reason for selling: Upgrade to VTA M125 Mono Blocks
Payment Method: Pickup (20 Kg), Cash only
Extra Info:

I purchased the amplifier kit from Bob Latino from the U.S. (paid a lot for shipping) with full set of the tubes (3 x Sylvania 12AU7, 1 x TungSol 5AR4, 4 x Soltek6550WE), capacitor upgrade (4 Power supply and 4 hand matched Russian K42-Y PIO coupling caps) and the 21 steps attenuator. Power transformer is 240V. OFC AC cord fitted with Rhodium plated Furutech IEC inlet. The Drive Board Cover is self made with pure copper plate and is grounded to the chassis as EMI shield.

Wired here in Syndey by myself with solder contains 2% Ag (silver).

Tested and is runnung perfectly.

I like it so much that I am now looking at upgrading to the VTA M125 Mono Blocks from Bob

Specifications of the ST-120 Amplifier with VTA Driver board
Power output . . . . . . …… 60 watts RMS per channel at 1 KHz at less than 1 % THD with both channels
driven in PENTODE or 32 watts RMS in TRIODE with both channels driven
Frequency response . . . . 10 Hz to 30 KHz +/- .1 dB at 1 watt
Power bandwidth . . . . … 17 Hz to 30 KHz +/- .3 dB at 60 watts
Distortion . . . . . . ………. Less than .15% THD from 20 Hz to 20 KHz at 1 watt, less than 1% THD at 60
watts 20 Hz to 20 KHz
IMD ………………………… Less than .45% (19 Khz and 20 Khz) at rated power
Hum and noise . . . . . ….. More than 90 dB below 60 watt output
Sensitivity . . . . . . ………. 1.1 volt in for 60 watt output
Bias setting …………… .500 volts DC per each KT88 or 6550 output tube
Feedback ………………… 13 dB total loop feedback
Tube complement . . . . … (4) KT88 or 6550 or KT120 (3) 12AU7/12BH7/5963/5814/6189 (1) 5AR4/GZ34
Size . . . . . . . . …………. 13" x 9.5" x 6.5"
Weight ……………………. 38 pounds (shipping weight = 45 pounds