New Octal Aikido Stereo PCB

Line Stage & Headphone Amplifiers

Octal CCDA PCB
New octal CCDA PCB and custom kits: PCB, resistors, capacitors, a selection of coupling capacitors and tubes, ceramic tube sockets, and board stand offs. Comes 16-page user guide
$30.00
Aikido Octal Stereo PCB
Aikido Line Stage Amplifier Kit (octal-based & stereo). Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), printed circuit board, ceramic tube sockets, and board stand offs.
$36.00
Aikido Noval Stereo
Aikido Line Stage Amplifier Kit (9-Pin & stereo). Part kits include tubes, resistors, PS and heater bypass capacitors, coupling capacitors, printed circuit board, ceramic tube sockets, and board stand off assemblies.
$36.00
Aikido 12Vac
Introducing the new Aikido 12Vac PCB and part kits. The key advantage of the Aikido 12Vac is that it can be operated from a lowly wallwart power supply, yet develop a fairly high-voltage B+ for the triodes.
$29.00
5687 All-in-One PCB & User Guide
The 5687 Aikido PCB is back, but different. Now, all the tubes are 5687s and the PCB is an All-in-One effort that holds both the high-voltage B+ and heater power supplies, just like the octal and 9-pin Aikido All-in-One PCBs.
$45.00
Two Aikido 9-pin Dual-Mono PCBs       .
Aikido Line Stage Amplifier Kit (9-Pin & dual-mono). Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), two printed circuit boards, ceramic tube sockets, and board stand offs.
$48.00
Aikido All-in-One LSA/HPA 9-pin
Aikido "All in One" LSA/HPA kit. Aikido 9-Pin stereo PCB, resistors, regulated high-voltage and heater power supplies, capacitors, heatsinks, solid-state devices, ceramic tube sockets, board stand offs, tubes and coupling caps—everything that is needed to populate the PCB available as options.
$59.00
Octal All-in-One LSA/HPA PCB
New Aikido "All in One" LSA/HPA kit. Aikido octal stereo PCB, resistors, regulated high-voltage and heater power supplies, capacitors, heatsinks, solid-state devices, ceramic tube sockets, board stand offs, tubes and coupling caps--everything that is needed to populate the PCB available as options.
$59.00
9-Pin CCDA PCB and User Guide
New Rev. B 9-Pin CCDA PCB and custom kits: PCB, resistors, high-voltage capacitors. Comes 16-page user guide
$30.00
ACF-2 PCB Octal and User Guide
The ACF-2 octal is an All-in-One design that holds both the B+ and heater power supplies and two Aikidoized cathode followers. In other words, the ACF-2 octal is a unity-gain buffer for those who do not need any extra voltage gain, but do need more current delivery than a passive line stage would allow.
$36.00
Unbalancer
The Unbalancer is a tube-based, balanced-to-unbalanced converter that accepts a balanced input signal and puts out a single-ended, unbalanced signal, much like a Broskie cathode follower, but with gain. (In fact, a Broskie cathode follower is the output stage in the Unbalancer circuit.) The input stage is a differential amplifier with a constant-current source load on the coupled cathodes. Besides performing its unbalancing conversion, the Unbalancer circuit provides voltage gain and exhibits a fine CMRR.
$36.00
ACF-2 PCB and User Guide
The ACF-2 is an All-in-One design that holds both the B+ and heater power supplies and two Aikido-ized cathode followers. In other words, the ACF-2 is a unity-gain buffer for those who do not need any extra voltage gain, but do need more current delivery than a passive line stage would allow.
$36.00
Aikido LV & User Guide
A new Aikido PCB, the LV Aikido, which is meant to replace my old 24V Aikido board. The 6GM8 is an amazing little tube and I am quite surprised by just how good this little tube can sound, but the 6GM8/ECC86 tubes have become so rare and so expensive that some other tube must be used. Thus, the "LV Aikido," which stands for low-voltage Aikido, as this board could be used with either a B+ of 24Vdc with 6GM8 type tubes or 48Vdc with ECC99 or 12BH7 tubes.
$24.00
BCF 9-Pin PCB & User Guide
The BCF receives a balanced input signal and converts it to an unbalanced output. It is a unity-gain buffer that offers a high input impedance, a low output impedance, low distortion, and great CMRR. In addition, because the BCF uses a push-pull topology, its use is not limited to line-stages, as the BCF can be used as a headphone buffer-amplifier if the headphone's impedance is high enough (say, 300-ohms).
$24.00
ACF 9-pin PCB & User Guide
The Aikido cathode follower PCB/kit is a modest affair, consisting of one tube per channel (two triodes per tube envelope) and a handful of capacitors and resistors. This unity-gain buffer, using a modified cathode follower, offers a high input impedance, a low output impedance, low distortion, and a great PSRR figure. In addition, the ACF does not invert the phase. The ACF use is not limited to line-stages, as the ACF can be used in creating an active crossover or even a headphone driver, if the headphone's impedance is high enough and the tube robust enough.
$24.00
Aikido Octal Dual-Mono PCB
Custom Aikido Line Stage Amplifier Kit (Octal & dual-mono). Select only what you need: tubes, resistors, PS and heater bypass capacitors, two types of coupling capacitors (PIO and film), printed circuit boards, ceramic tube sockets, and board stand offs.
$48.00
Aikido Cascode PCB and User Guide
The Aikido Cascode amplifier is a compound circuit consisting of a cascode input stage amplifier and an Aikido cathode follower output stage buffer. The cascode circuit offers two huge features: gain, lots of gain; and low, very low input capacitance; thus, it delivers high gain and wide bandwidth. The cascode amplifier offers high gain, but a dismal PSRR and high output impedance. Fortunately, the Aikido cathode follower topology can undo the leaked power-supply noise, while presenting a low output impedance
$36.00
SRPP+ Noval
Due to popular demand, the SRPP+ is back, minus the power supplies. The new PCB is 6in by 5in and, like all GlassWare PCBs, is crazy overbuilt, with extra thick double-sided PCB material and heavy 2-ounce copper traces. Each channel gets its own large power supply RC filter, whose voltage rating can be a low 250Vdc, perfect for high idle current applications, such as headphone amplifiers; or, 400Vdc, perfect for line-amplifier use. The SRPP+ PCB holds pads for two sets of output coupling capacitors. All in all, it's a fun little board and I can imagine many different audio applications, from the input stage of single-ended amplifiers to headphone amplifiers for high-impedance cans, such as those offered by Beyer and Sennheiser.
$29.00