SAS Audio Labs ^TM

25 Watt Triode Amplifiers, EL-156

Two Stage 25WPT Monoblock PushPull Triode Amplifiers:

Albert, Dallas, Texas "I honestly did not think the sound would improve with the new amps...but WOW! running mono right now and its as live as it gets... Albert"

The 25WPT monoblock pushpull triode amplifier is 25 watts of pure triode delight. The 25WPT tube amplifiers incorporate two total stages with separate power supplies for each stage for more beautiful music. The 25WPT has a tonal balance switch, 4, 8 ohm speaker switching, and a unique 60hz hum balance control for your convenience. The hum balance 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 other huge plus is that the total harmonic distortion (HD) entering the output tubes is less than .05% with an amplifiers output of 25 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 produce 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 by excessive heat. This is truly a conservatively rated tube.

The EL-156 output tube removes the "fog" a 6550/KT88 leaves, has a larger soundstage, better dynamics, and has instruments/voices seemingly suspended in space. It is just so lifelike. And reliability is one of our foundations.

2 Stage 25WPT Pushpull Triode Amplifier Specifications, Price:

Frequency Response:                                7.5-80khz (8 ohm) -3db. 
Power Output per Channel:                          25 watts RMS triode, 28 Watts typical clipping
Sensitivity:                                       2.5 vrms (EL156)
Input Impedance:                                   100k ohms
Global Feedback:			           0 (No frequency dependent musical feedback through a decoupling cap)				  
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) 
Output Tubes:                                      EL-156 (Triode Operation) 
Driver Stage Distortion:                           0.05% THD (at 25 watts output)
Total Harmonic Distortion Amp:                     typical 0.05% at 1 watt  
Total Harmonic Distortion Amp:                     typical 0.7% at 25 watts
Power Requirements:			           120vac 60hz

Dimensions per Chassis:                            Width: 17" (approx 429mm) 
(Tubes sent separately)                            Depth: 14" (approx 354mm) 
                                                   Height: 9" (approx 228mm)

Monoblocks only:
Wholesale Price ea. 25WPT:                         $1795.00 each 



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.

25WPT Pushpull Triode Amplifier Guarantee/Warranty

30 day money back guarantee, excluding shipping. 5 years labor and parts from date of purchase, and 1 year on small signal tubes.
Guarantee, Return Policy on Tube amplifiers:

To Purchase 25WPT Pushpull Triode Amplifier

25WPT Monoblock Pushpull Triode Monoblock Amplifier. Change Quantity for more monoblocks and click "Update Cart".

Or simply send a Personal Check, Cashiers Check or Money Order (US dollars) payable to SAS Audio Labs. Please allow sufficient time for such to clear. No refund will be issued if the bottom plate seals are disturbed, scratches or alterations. The audio amplifiers must be returned in new double boxes/materials and must be fully insured for the purchase value when shipped. 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 amplifiers.

Specifications, Prices subject to change without notice.

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copyright©: 6-24-1999. Updated: 07-16-2010. SAS Audio Labs and all contents of this page article, including graphics
(except Svetlana Tubes), components, component layouts, any and all designs and schematics, "lead to lead wiring" are copyrighted. All rights reserved.
No portion of this article may be reproduced without the written permission from
Steve Sammet at SAS Audio Labs. SAS Audio Labs is registered with the state of Illilnois.