Pushpull Tube AmplifierPushpull Tube AmplifierThe EL-156, 50WPU monoblock ultra-linear amplifier is a pure delight. The 50WPU incorporates two total stages with separate power supplies for each stage to eliminate frequency dependent musical feedback that occurs through one common power supply. The 50WPU has a tonal balance switch, 4, 8 ohm speaker switching, and a unique 60hz hum cancelling control for your convenience. The hum control is not your typical filament balance control but a proprietary designed control to minimize, if not eliminate, hum problems caused by internal and outside 60hz loops.
One huge plus is that the total harmonic distortion (HD) from the first stage is less than .05% with the amplifier output of 50 watts. At that first critical watt, the distortion is virtually zero. This means the first stage/driver stage produces almost no harmonic distortion (HD), unlike other types of gainstages using other tubes. This is important as the combination of input/driver tube HD and output tubes HD produces higher order distortions. For example, 2nd and 3rd harmonic distortion from both tubes combine to produce 4th, 6th, and 9th order harmonics. The lower the 2nd and 3rd HD from the input tube/stage, the lower the 4th, 6th, and 9th harmonic distortions will be.
The EL-156 tube is rated 50 watt plate dissapation and in tests was capable of 65 watts of plate dissapation (75 watts by another individual) without the plate glowing cherry. However, KT88 is optional, if one so desires, but I must change the self bias. By the way, reliability is one of our foundations.
Number of Chassis: 2 (Dual Mono Design)
Frequency Response: 5-75khz -1db/-3db respectively
Power Output: 50 watts RMS 4,8 ohms (state 4 or 8 ohm tap prefered)
Sensitivity: 2 vrms. in for rated output power
Biasing Output Tubes: Self Biasing
Input Impedance: 100k ohms
Global Feedback: 0
Total Weight ea.: 27 lbs. (Shipping Wt. 30 lbs)
No. of Stages/Channel: 2
Driver Tube: JJ6922 a superior tube
Output Tubes: EL-156 (Ultra Linear Operation) KT-88 optional
Total Harmonic Distortion Amp: 0.06% at 1 watt typical
Total Harmonic Distortion: 1.3% at 50 watts output typical (Clipping typ. 52 watts)
Power Requirements: 120vac 60hz (2 amp slo-blo fuse)
Dimensions per Chassis: Width: 19" front (17" chassis, 43.5cm)
Depth: 14" (25.5cm)
Height: 8 1/2" (30.5cm)
Monoblock Only:
Wholesale Price ea. 50WPU: $1795.00 each Continental USA shipping included
Continental USA shipping included. Outside USA, check on shipping charges.
Tubes must be installed upon delivery. Plug output tubes in either socket. E88cc into its own socket.
30 day money back guarantee, excluding shipping. Warranty, 5 years labor and parts from date of purchase, and 1 year on small signal tubes. 90 days on output tubes.
Guarantee, Return Policy:50WPU Monoblock Ultra-Linear Tube Amplifier
Or simply send a Personal Check, Cashiers Check or Money Order payable to SAS Audio Labs. Allow sufficient time for personal and company checks to clear. No refund will be issued if the bottom plate seals are disturbed or altered. The ultra-linear amplifier must be returned in the original box (double boxed) and materials and must be fully insured for the purchase value when shipped to cover any damages. Prices subject to change without notice.
Danger! Vacuum tubes get very hot during operation and thus precautions should be taken so that children do not come in contact with the tube amplifier.
Specifications, Prices subject to change without notice.
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