MARK IV KIT (120 VAC)
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Full kit package less tubes and top vented cover. Kit requires user assembly of PC board. Choose either type: (A) original 7199 tube design or (B) our new 6GH8A tube design.
Note: The 7199 tube has become increasingly scarce. Unless you have an ample supply of this tube type then we strongly suggest you consider our Version (B) Kit.
Both MK IV kits include our new brown Polyimide circuit board!
Review by Don of Santa Fe, New Mexico 2018 (Updated 09-2019)
I now have 1630 operating hours on the MK-IV’s (with JJ-KT77’s) and just wanted to tell you that they sound wonderful! They operate @ 0.93 amps (each) between 123 & 125.4 vac. (both amplifiers included CL-90 Thermistors to address this elevated line voltage) I am starting to believe they sound better than my Quicksilver Mid-Mono amps (EL34’s) and my PAS Labs XA-30.8 solid state Class-A amp !!!
In short, these kits have been the best audio investment I have ever made. Thank you again for all your help, guidance and ideas.
|CIRCUIT TYPE:||PUSH-PULL DESIGN (MONO AMP)|
|POWER OUTPUT:||40 WATTS PER CHANNEL|
|TUBE TYPES:||(2) EL34 (6CA7) OUTPUT TUBES “MATCHED PAIR”
(1) 7199 or 6GH8A PENTODE TUBE
(1) GZ34/5AR4 RECTIFIER TUBE
|INPUT SENSITIVITY:||1.3V FOR 40 WATTS OUTPUT|
|INPUT IMPEDANCE:||470K OHMS|
|OUTPUT IMPEDANCES:||4, 8 & 16 OHMS|
|NOISE & HUM:||MORE THAN 90 DB BELOW RATED POWER|
|THD:||LESS THAN 1% AT FULL POWER|
|FREQ. RESPONSE:||20 HZ TO 20K HZ AT FULL POWER + / – 1 DB|
|SIZE:||6 ½” H X 14″ W X 5″ D|