audio-talk

I need more inputs, as I want to use my Beresford DAC to give hi-fi sound from the TV and AppleTV, via optical, so will be rebuilding the amp into a new chassis over the next few weeks. It's a nice little amp and deserves a bit better than a scratched to fsck bit of bent metal for a case. Obviously ...

I've taken on board a few things, put in a bit of work and done some alterations to the power supply. With a 100uF EL34 cathode bypass cap in series with the last cap in the power supply (changed to 50uF + 50uF, F&T dual electrolytic) I now have 33.33uF instead of the 15uF, giving a 3dB point of...

Forgot about the caps being in series making 15uF in total, which puts the 3dB point at 27hz.

Bit of food for thought there.

Again, for the sake of completeness: KT66 or EL34? Both are good. I prefer the latter, but others might prefer the former. It's all subjective in the end.

Configuring the James OPTs for 3.5K primaries means one can use EL34s properly: EL34SEUL.jpeg I might install a double pole changeover switch so that the primaries can be switched between 5K and 3.5K (not on the fly!) to make it a nice versatile piece of gear. It now puts out 10.8Wpc in single ended...

Ya paid ‘ow much?
You were robbed!

OPTs are James 6123HS.

Morgan Jones wrote: ↑Thu Feb 29, 2024 2:10 pm Nice neat construction with proper heater wiring.

Cheers Morgan,
I learned how to do heater wiring from your “Building Valve Amplifiers” book.

Replaced my shagged out soldering iron yesterday with this cordless iron: Brilliant bit of kit. Excellent for hairy-arsed valve amp projects. I will now be able to build amps without making a ton of dry joints.

For the sake of completion:

Inspired by Paul's adventure with the sixty-five-fifty SE amplifier, I've decided that great though the 6V6 amplifier is; it's not really dynamic (powerful) enough for the relatively inefficient 87dB/W Mission 773 speakers. Loads of finesse, detail and sweetness from the amp but a little lacking in ...

Good result Paul. Sounds like it was worth all the effort!

Me three

To safety pins even!