audio-talk

Just a quick question: I have a high quality, Khozmo shunt stepped attenuator, that cost three figures when I bought it for use in a balanced passive preamp. I'd like to use it with the valve amp rebuild but it is only 10K. Is there any reason not to use it in front of the 6SL7 input stage of the va...

Cheers Simon, Output transformers are now mounted. Took me all day. Not as fast as I was, but it’s not about speed or urgency; not these days. IMG_0375.jpeg Valve sockets will go in tomorrow along with the input sockets and speaker outlets. Rest of the infrastructure (tagstrips, busbar etc) on Thurs...

Inside so far: Brass bars held by M5 bolts keep the caps in place and rectifier socket hole has been punched.

A little more progress: Caps, power transformer and choke mounted. Output transformers tomorrow.

…We’re both rising from the ashes… Definitely Paul. It’s the making and the metalwork, planning the layout, dressing the leads inside, whilst trying to take care not to create unnecessary stray capacitance that I like. My head is only just starting to get around designing the circuits themselves ag...

The NVA based solid state amp is currently doing sterling service in place of the valve amp. That’s the great thing about hi-fi; you always get 2 improvements. The first one came when I replaced the NVA based amp with the valve amp, the second, when I replaced the valve amp with the NVA based amp. I...

A bit of progress on the chassis today:

Excellent stuff!

Seconded

Yes, as Phil said, it’ll only work harden if repeatedly bent backwards and forwards, then it’ll snap.

simon wrote: ↑Sat Mar 09, 2024 9:45 am Nice Steve. Does aluminium work-harden at all or can it be bent "in one"?

It does work harden so you probably have only the one chance to get it right. Steel is more forgiving but harder to get moving in the first place. Copper would be a brilliant option for bending.

I'm no metalbasher Steve, how did you get such a nice corner and straight side at the front? I use a thick chopping board with a machined straight, flat edge. Place the metal sheet on the edge of the kitchen worktop, then place the board on top of the metal to be bent and line it all up with the lo...

It's not cheap, but I think it's worth using.
https://www.wickes.co.uk/Wickes-Metal-P ... m/p/116725

Right then! Mk2 is stepping tentatively off the drawing board: IMG_0366.jpeg Holey aluminium has been bent into shape, giving more front to back chassis depth than the mk1, which means… IMG_0367.jpeg I can bring these three big buggers out of retirement. It will have a choke-input power supply off a...

Certainly sounded kick-ass on that video.