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Reviews (2)

30 Jan, 2018
Decent SET tube kit
If you're building the kit, head over to diyaudio and check out the Boyuu A9 thread. There are quite a few mods that have been been documented there. These mods will 100% improve the overall sound quality of the amplifier, and honestly they should be something that the manufacturer is providing.
Before I implemented the mods, the output was noisy with a 60Hz hum, and was quite fatiguing to listen to. After the mods were performed, the amp sounds positively amazing.
I've switched the tubes out as follows: RCA 5U4G diode, matched GE 6SL7 input triodes, and apex-matched JJ KT77 output tubes. I also opted for an Alps 100KAX2 100K ohm stereo input potentiometer with logarithmic taper
Other mods that I did that probably didn't have as much impact on the final result: Dayton Audio poly input caps for the ones in series between input and output stages. WBT silver 4% solder in the signal path. Canare Star Quad shielded cabling for the input signal path. Dayton Audio insulated RCA jacks, and 100% of the kit resistors and caps were replaced with better spec'd versions from Digikey.
Anyway, after everything above, this amp sounds amazing. Zero noise/hum, very well behaved, but the distortion is quite pleasant when you turn it up. 10/10 would DIY again.

08 Sep, 2016
Goldilocks springs for your RepRap bed or extruder
These are perfect for a Wade's extruder or a standard heated MK2B bed on a RepRap.