Universal DHT Single-ended Super OTL Power Amps

Model no: DHT-100W-Delux
No-frills out-of-the-factory price C$5,680 Untitled Document [US$ 4544] only !!

Expected retail store on-sale price after reviewers and marketing mark-up $11,000 or higher

100Wrms x 2  Universal single-ended DHT pure class A Super OTL power amplifier with true balanced input (45 / 245 / 2A3 / 300B compatible)


This is our high power series of Universal single-ended DHT Super OTL power amplifier which can use those well known beautiful sounding direct-heated filament triode, you can use either 45, 245, 2A3 or 300B tubes in there. Input tubes can use 6SL7, 6SN7, 6SU7 , 5691, 5692, ECC32, ECC33, ECC35, CV181 ....and all compatibles. Now you can enjoy super high power output from those legendary sounding tubes, without the limitation of just a few watts in old school designs.

This model has both RCA and XLR inputs, power-on delay and speaker DC offset protection circuit ,

This amp features the following mind-blowing characters:

1. All tubes working in pure class A single-ended operation mode with zero negative feedback, as well as our special 3D point-to-point and component-to-component hand wiring technique.

2. Advanced new age revolutionary power supply and amplification design result in much better sonic performance than others who asked for a much higher price tag

3. Our proprietary Super OTL design without output transformers, maximum damping factor and most widest bandwidth can be achieved, the beautiful characters of those DHT tubes are totally exposed, the bass punch, control and richness is so good that exceeds any traditional old school SET or OTL designs while the mid and high range silky outstanding dynamics as well as sweetness still holds. Just one single DHT as output tube, no need to parallel two or more tubes, so the most puriest and linear class A sound as result.

4. Super low noise level, you can hardly hear such quiet and dark background from an old school design

5. 100% Automatic bias and no bias adjustment is necessary, no need to re-calibrate but just plug and play of different tubes. The DHT tube works under a totally safe and long lasting operation conditions, which can almost last forever until the filament drop dead by itself (typical 10000hrs)

6. Dual power filtering capacitor banks design for maximum channel separation for either small or large signal reproduction.

7. Integrated our most advanced MDE (micro-dynamics extraction) design. Which can extract very minute information typically immersed below the background noise to surface out effortlessly. You can easily hear the real end of each music note in the recording which you never experienced before, with those invisible links between each notes. Every musical instrument will have astonishing 3D separation from each other but with the invisible musical link in-between. Any musician can get really excited by the performance of this circuit, since each phrase of notes and chords can easily tell without masked by vocals or other instruments, a real musical reproduction of sound.

8. Real out-of-the-factory price, no expensive marketing and reviews which cost typical 80% or more of the unit price. Your each one dollar investment get at least 5 to 10 dollars back in terms of sound.

9. Retro look VU meter design with elegant solid-wood side panel, all solid aluminum panels as well.

10. Soft start filament supply to DHT tubes for prolonged life time.

11. 100% professionally hand-built in Canada by 3D component-to-component and point-to-point wiring technique . Filament voltage selectible between 5V DHT (300B) or 2.5V DHT (2A3/45/245 )

12. Dual mono gain control included, which can use to balance the small variations in the gain of different tubes, so that closely matched tubes are not too much necessary, this feature is especially convenient for NOS tubes. It can also make this amp work much more easily in bi-amp or tri-amp configuration, which balance of gain between different amps are critical.


No. of inputs 1 set of RCA inputs + 1 set of XLR balanced inputs (input impedance 100Kohm typ)
No. of outputs 1 set of speaker outputs ( 4-16 ohm)
Freq response 2Hz - 40Khz (-3db)
S/N > 90db at full power output
Phase non-inverted
manufacturing hand-wired point to point for tubes and power supply sections
Tubes used

6SL7(default) /6SU76SN7/ECC32/ECC33/ECC35/CV181/5691/5692 x 2

+ 2A3 (default) / 45 / 245 / 300B x 2

(replace 2A3 with 300B add $200)

Output power /ch

100Wrms (8 ohm) or 200Wpk (4 ohm)

1 year free parts and labor warranty, tubes 90 days under normal operation condition

standard chassis for delux version : solid wood + thick Aluminum hybrid chassis

All information on this website is copyrighted by Space-Tech Lab. Ltd. 1996-2024 .

Our product designs are protected and not permitted for replication or implementation. All Rights Reserved.

Save the earth and save yourself, be a vegetarian and keep enjoying music for a long long time !!