Looking very nice, Will.
Ultrafide U500DC power amplifier - Croft Vitale )highly modified) - TRIO L-07D Turntable - Denon DL103C1 - Funk Firm Houdini - Lentek MC head amp - 15" Tannoy Monitor Gold Loudspeakers in Lockwood Major cabinets (From Trident Studios) - Tannoyista SPEC 3 Custom Crossovers - VanDamme Black Speaker Cable
Tannoyista.com - Audio Equipment Reviews
Many thanks
A note about the protection circuit.
It's extremely simple - but quite effective. It just watches the cathode current of each output valve. Because the average current in a Class-AB amplifier varies, it employs a time constant to ignore short term high current spikes from music, et cetera, but trigger on a longer term overcurrent / fault. There is actually a more accurate way to implement such a circuit, that will more or less ignore music current swings and only trigger on a fault, but the additional complexity would be hard to justify, when this already works quite well, and just consists of resistors, diodes and capacitors.
As well as this, each valve has a rapid response trip for severe faults that will bypass the time constant, to reduce any potential damage as much as possible.
Radford Revival
www.radfordrevival.co.uk
Location: Middlesex, UK
Posts: 4,482
I'm Alex.
I was going to ask for more details about the protection, but you have beaten me to it, thank you.
Spendorman
Location: Middlesex, UK
Posts: 4,482
I'm Alex.
Location: Torquay, Devon.
Posts: 5,684
I'm Shane.
Nice pictures, Will.
Do you also build ''Integrated'' versions of these Radfords too? Or, at least a Radford, with built in volume pot?
S.
Just for the record it is currently around about 9:40pm and I've been soldering on and off since this morning, and have now stopped for the day. The amp is getting there now but these things aren't half labour intensive to build. I'm tired!
Radford Revival
www.radfordrevival.co.uk
Location: Torquay, Devon.
Posts: 5,684
I'm Shane.