SAS Audio Labs is happy to unveil the two stage 50 Watt push pull, Ultra-Linear Monoblock Amplifiers based around the conservatively rated EL-156 tube. With only two stages, that first watt is simply the best possible.
Unique features include individual power supplies for each stage, a two position tonal balance switch for bass touch up, 4 - 8 ohm speaker tap switch, and a unique 60 hz hum cancelling circuit (not a typical filament balancing design) that one can virtually eliminate 60hz hum caused by ground loops. The monoblocks sound simply stunning with the Von Schweikert VR3, VR33, VR-4s and up, Selah Phast Jr., GR Research AV-3 etc.
The EL-156 tube is conservatively rated 50 watt plate dissipation. I have tested it at 65 watts and no cherry.
Specifications:
Frequency Response: 9-75khz (8 ohm) -3db.
Power Output per Channel: 50 watts RMS (switchable 4, 8 ohm, triode)
Sensitivity: 2.5 vrms approximately
Input Impedance: 100k ohms
Global Feedback: 0
Total Weight ea.: 27 lbs. (Shipping Wt. 30 lbs)
No. of Stages per Channel: 2
Driver Tube: JJ E88cc triode (approx 1/8 the distortion of NOS, including 6SN7 types)
Output Tubes: EL-156
Driver Stage Distortion: 0.03% THD (at 50 watts output)
Total Harmonic Distortion Amp: typical 1.3% at 50 watts
Power Requirements: 120vac 60hz
I believe in complete separate power supplies for each stage (including transformers) to minimize frequency dependent musical feedback through the power supply. (Musical feedback occurs in nearly every amplifier with common power supply.) This results in a more natural, transparent, live sound.
More information can be found at:
http://www.sasaudiolabs.com/50ppu.htmhttp://www.sasaudiolabs.com/theory8a.htmCheers.
Steve Sammet
SAS Audio Labs
503 W. Jefferson St. Suite #2
Morton, Illinois 61550 (near Peoria)
http://www.sasaudiolabs.comsasaudio@omnilec.com
(309) 263-0736 (noon to 6pm Monday - Friday)
