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AUDIO NOTE Read consumer feedback on our Audio Note Custom products.
 The Audio Note 6550 integrated stereo amplifier yields about 12 watts in
pure unblemished Class A, single-ended operation. It uses a single 6550
pentode per channel, one of the most popular and reliable pentodes ever
designed in a single-ended arrangement. Each stage of the amp is operated in
class A.
The AN 6550 uses a simple circuit, where both channels of the input fed directly to each half of a 6SN7GT double triode operating in an unusually high current mode, the gain control potentiometer is placed AFTER this first gainstage to allow the amplifier to be driven by any source with a minimum of noise introduced by this first stage. The 6SN7GT input stage feeds a 12AX7 driver stage. The 12AX7 is a miniature double triode of high gain and in this circuit is configured in a SRPP (Shunt Regulated PushPull), which gives a gain stage with a very wide dynamic swing, low impedence and outstanding drive capabilities.
Pricing: Happy New Year Bill, PQ KIT 1
* The Latest Version of the PQ Kit1 can be wired as a 2A3 or a 300B
amplifier. It comes with copper brackets on the large double C-Core output
transformers along with gold knobs as standard. We use the ELMA Selector
Switch to select up to 3 sources.
So how do you improve on the already superb Kit1 Standard Edition? We are lucky enough to have access to Audio Note's high-end double C-core output transformers that are used in the AudioNote finished products. We have incorporated these output transformers into the Kit1 and we call it the PQ Edition. These transformers are hand made on site at the AudioNote UK factory. These remarkable transformers (Hi-B 0.15mm TRANS-300 series) have the effect of increasing depth and resolution; offering that true high-end SET sound across the full frequency range. The PQ Kit1 300B/2A3 also includes other upgrades as standard such as Black Gates on the driver and 300B (or 2A3) circuits, TKD volume pot, etc. (see list below). Because the Double C-Core transformers are bigger than the TRANS-152 transformers used in the Kit1 standard edition, we had to make the chassis bigger in order to accommodate them - it is now 35mm wider than the original chassis. We offer two different base kits for this range (see further down the page). Here is a list of the things that are upgraded as standard from the Kit1 Standard Edition Basic model:
All current versions of the Kit1 are integrated amplifiers. That is, they can accept input from any standard line-level Hi-Fi component. A volume control is accessible on the front of the chassis. Output transformer taps of 4 and 8Ohm are available on the rear of the unit to make speaker matching easier. The mains transformer can be internally configured for many different countries. Upon request, multiple inputs can be accommodated via an additional input selector for the front panel. All necessary components are supplied in the kit, including valves. The input stage consists of a 6SN7GT with a 5687 double triode driver stage running in SRPP. The power supply is a capacitor-choke-capacitor with a 5U4G HT rectifier. Please enquire about hard-wiring options for drive and power supply boards. Also feel free to enquire about any extreme upgrades that may be available.
 Rear view showing speaker outputs, stereo inputs, mains input socket and switch
Audio Note are now providing copper frames as standard with their double c-core output transformers. The copper frames being non-magnetic improves not only RF influx, but also low level behavior as it does not short out the air gap.
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