Single-Ended Tube Amps

Model no: IA-300B-STR
$4,880 Untitled Document [US$ 3904]

8W x 2 single-ended integrated amplifier with Super rectifier

This is one of our state-of-the-art single-ended integrated amplifiers, using the most common 300B medium power tube as the output section. High grade silicon-steel 15W single-ended output transformer is used to ensure the highest sonic quality. This amplifier can drive speakers with efficiency above 88db/W to satisfy loudness level in a reasonable size room.

Multiple output tapping is featured for correct impedance matching to almost any speaker. 16ohm speakers can also use the 8 ohm output setting for increased performance.

The 300B has a very sweet and transparent characteristic which makes it very suitable for classical music, vocal, and jazz reproduction.  

Built-in super rectifier section with the capability of using rectifier tubes (2.5V / 5V) like 866A, 3B28, 3E22, 80, even 2A3 and 300B is possible . With 4 pin to 8 pin adaptor, you can use 5U4G, 83, 274B...etc.

Standby / operate switch for manual soft start which can extend the life time of 300B tubes as well as mercury vapor rectifier tubes.

Built-in choke for soft start.

AC filament / DC filament of your choice as option when ordering


Customer feedback:

From Bill

Well, I received the integrated amp a couple of days ago (at night), and all is working out just fine. I've been running the amp, and from the first listen I heard an improvement in the sound. A lot more detail than I've heard before. All I can say is; GOOD JOB! The amp looks good (wife acceptance factor) and sounds good. I'm real happy. 

Oh, I've been listening with my AR3a's and I'm getting good base! I have no problems with that match. And it's going to get better-I'm using a general Electro Harmonix 300B to break in the amp. Once I get familiar with the amp, I'm going to start rolling some better tubes in it. For the 866A, the 6SL7, the 6SN7, and the 300B;

Oh, and before I forget, your owners manual is SUPERB! Probably one of the best manuals I've ever seen. I like how you list the different tube types. I figure if you keep sending out this manual (& like-others to go with your other gear), you may win an award! I'd give you the "Gold Star Award".


No. of inputs 3 set of RCA inputs
No. of outputs 1 set of speaker outputs ( 4 or 8/16 ohm )
Freq response 10Hz - 30Khz (-3db) typ
S/N better than 80 db at full power output (DC filament)
Distortion Depend on type of power tubes being used due to non -ve feedback design
Phase non-inverted
manufacturing hand-wired point to point
Tubes used 1 x 6SL7 + 2 x 6SN7 + 2 x 300B + 2 x 3E22
Output power /ch 8Wrms pure class A, single-ended


1 year parts and labor warranty, tubes 90 days under normal operation conditions
standard chassis : Gold/ Black/Metallic  MDF , Aluminum chassis

(optional chassis : Mirror steel, black piano , solid-oak )


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