Featured Products

12Vac SRPP
Introducing the new 12Vac SRPP PCB and part kits. The key advantage of the 12Vac SRPP is that it can be operated from a lowly wallwart power supply, yet develop a fairly high-voltage B+ for the triodes. Where the typical tube-based line-stage amplifier requires a B+ of 200V to 400V, the 12Vac SRPP can get by with only a B+ voltage of 120Vdc. A wallart's low-voltage AC from is all that is required to power the Aikido 12Vac.
12Vac SRPP HPA holds two hybrid SRPP headphone amplifiers. The output stage is actually a small power amplifier in its own right (a Zen single-ended amplifier). It consists of one MOSFET that is loaded by a constant-current source, which is made up of an LM317P voltage regulator configured as a constant-current source. A two-resistor negative feedback loop sets a gain of 1 (unity) for the inverting output power amplifier. Each channel sees a 200mA idle current flow, which is enough to deliver 3Vpk of output voltage into 16-ohm headphones and twice that into 32-ohm drivers. Of course, can easily drive 300-ohm headphones.

Reasons to shop from us

E-mail from GlassWare Customers:

Hi John,

I received the Aikido PCB today - thank you for the first rate shipping speed.

Wanted to let you know that this is simply the best PCB I have had in my hands, bar none. The quality is fabulous, and your documentation is superb. I know you do this because you love audio, but I think your price of $39 is a bit of a giveaway! I'm sure you could charge double and still have happy customers.

Looking forward to building the Aikido, will send some comments when I'm done!

Thank you, regards, Gary.


Mr Broskie,

I bought an Aikido stereo linestage kit from you some days ago, and I received it just this Monday. I have a few things to say about it.. Firstly, I'm extremely impressed at the quality of what I've been sent. In fact, this is the highest quality kit I've seen anywhere, of anything. I have no idea how you managed to fit all this stuff in under what I paid for it. Second, your shipping was lightning-quick. Just more satisfaction in the bag, there. I wish everyone did business like you.

Sean H.