You are reading a single comment by @Dogtemple and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Dogtemple
Jonny69
Posted this on Retro Rides where the build is, and for 3W per channel it kicks some ass. Not maxed it out yet but I've already had it up antisocially loud and it wasn't clipping. It’s not got the low down thunder that my big MOSFET amp has, but I think that’s to be expected given a) it’s not 100W per channel and b) it’s running very small output transformers which will limit the low-down response. All in, it sounds really good and I can see how people running high-quality output transformers find this an excellent hifi amp.
Temperature-wise, it COOKS. It is a seriously hot-running amplifier and I expect the electric meter was spinning in disbelief. It has that distinct hot valve amp smell, which I guess is the hot transformers. I know class A transistor amps run hot, but I wonder if I can do something about this (aside from adding a bit of airflow) by limiting the HT current directly on the output valve anodes. This would limit the current running through the output transformers and thus reduce the heat generated. The knock-on effect would be lower current draw from the mains transformer so that would also generate less heat.