I am going through my "buy it and try it" phase right now. These four month old amps are a stunning example of Dennis Had's (Founder of Cary Audio) work.They were built specifically for me by Dennis in July of this year. They are rated at 20 - 25 watts each with the included Sophia Mesh Plate 274b rectifier. They are neutral, immediate and effortless in sound. They are should work well for 91 dB+ efficiency speakers. From Dennis' eBay ad: NEW INSPIRE 25 watt 6V6 MONO BLOC TUBE AMPLIFIERS by DENNIS HAD FEATURING THE 6V6 BEAM POWER VACUUM TUBE MONO AMPLIFIERS IN A SINGLE-ENDED CLASS A DESIGN. QMB-25 THE QUADRA SINGLE-ENDED MONO BLOCS. Inspired by music of the 6V6 vacuum tube amplifier of my youth this design might be the best I have heard in 57 years since listening to my fathers string quartet practice in our home on friday nights *** FRIDAY NIGHT LIVE MUSIC IN THE HAD HOUSEHOLD *** On a technical basis the QUADRA QMB-25 Inspire 6V6 music machine mono blocs have a number of features listed below:
* Four (4) 6V6 tubes run in a parallel single-ended class A beam power mode
* 6N7/1635 Dual Medium Mu triode driver
* Dual B+ power supplies on each amplifier ... one supply for the output tube anodes and the second B+ supply for the regulated power supply section
* Fully shunt regulated, low impedance 6V6 tube screen grid B+ power supply * Fully shunt regulated, low impedance input tube driver, 6N7, 1635 driver B+ power supply
* Four (4) individual R/C auto bias circuits .. one for each 6V6 output tube auto bias
* Large oil filed regulated power supply section filter cap
* Filter choke Pi-Network power supply
* Precision non-inductive metal film 3 watt resistors
* Paper and oil filed, epoxy encapsulated, coupling and by-pass capacitors * Gold plated copper RCA input jacks * Gold plated copper output speaker posts
* EE Teflon silver stranded 19 strand hook up wiring
* Pure 99.9% Silver Teflon Insulated internal coax interconnect
** NEW Custom design, hand wound 25 watt SE air gapped output transformers, left and right channel matched pair
* 100% duty cycle CCS power transformer designed for 120/240 VAC 50/60 Hz primary * .080 (12 ga) aluminum chassis and matching bottom plate * 25 + watts per channel output with 5AR4 rectifier 20 + watts with Sophia Mesh Plate 274B rectifier ... both included for each mono
* Duty cycle of the QMB-25 MONO amplifiers is 24/7 in full operate conditions
* Frequency response @ 1 watt 15 Hz to 75 Khz +- 0 dB
* Frequency response @ 20 watts 23 Hz to 60 Khz +- 2 dB
* 61/2" wide by 13" deep and weight 18 pounds
Almond/Mocha clear coat powder coat finish
* Burled Walnut front panel I am pleased and excited with the new QMB-25, QUADRA mono bloc SE class A amplifier offering. I hand build each amplifier from the raw metal and basket of parts. I consider this my form of musical and electronic art. Each amp is a new baby to me and I listen to each amplifier in both the shop listening room and my home listening room. This is a passion I have held for over 56 years now ever since I built my first single-ended 6V6G hi-fi amplifier for the 7 th grade science fair. I never dreamed that retirement was going to be so much fun!!!!!!! Love it!!!!! Thank you for your interest and support in my Special QMB-25, Mono Bloc single-ended amplifiers and have a great day ......... Dennis J. Had W4USR Radioman731 retired Founder and President of Cary Audio Design The tubes included with each QMB-25 mono bloc : a QUAD of Electro-Harmonic 6V6 output tubes , RCA 1635/6N7 input tube and 274B Sophia Mesh Plate rectifier ... also included Tung-Sol 5AR4 Join the Inspire fun!!!!! .... Every body needs a single-ended class A audio amplifier .... The MB-25 mono-bloc amplifiers will drive most cone type loudspeakers in the 85 dB SPL range or above and impedances as low as 1.5 ohm!!!!! Dennis I will include an octet of NOS Pope (Philips) 6V6 tubes. These alone sell for $400. I will also include a new octet of Electro Harmonix 6V6 output tubes.
| 
