11-28-2023, 06:39 AM
(11-27-2023, 12:38 PM)Tim Curtis Wrote: Nice :-)
Is that a DIY Amp?
It's a kit from AliExpress that I took a chance on not being junk. Chose this one in particular in that it was simple, no transistors, had no bluetooth/screens/meters, and was a push-pull type so it has reasonable output power for the price.
https://www.aliexpress.us/item/2255800100204524.html
Didn't come with any instructions, just components, chassis, wire, parts, tubes, and a schematic. All was well packed and arrived undamaged. PCB was nice quality, with markings for all mounted components.
Was a fun build, and I'm surprised at how good it sounds. Only a few minor issues:
- Power transformer primary is wound for 110v, causing the heater voltage run too high on 122v wall power. Added a couple of resistors to bring that down.
- Output transformer secondary wires were labeled incorrectly, had to swap ground/8R connections.
- Came with weird off-brand electrolytics, so I built with Nichicons instead
- RCA inputs are not great. I have a better pair to swap in at some point.
Bonus additions:
- Bleed resistors on the filter caps for safety
- Added pilot on the front panel
