Haha! Me posting that pic of myself scared everybody off!
Y'all didn't know I was such an ugly old git did youse?
Well that's due, in part, to radiotherapy and chemotherapy and surgery but also it's down to old age and too much alcohol and drugs when I was a yoof.
Here's what I done over the weekend:
My pair of monoblock push-pull EL84 valve amps were housed in a 19" rack case which caused them to get too hot so I installed a pair of 80mm fans with a CCTV 12V PSU to run them, problem solved. But over a year later, although the fans are quiet, I was aware of them running when the room was silent which began to grate on me a little.
So I decided to fit the amplifiers to a base and thus not have to use cooling fans. This is something I've never done before, I'm not the best carpenter or metalworker on the planet but thought I'd give it a go. As I have plans to build a SET valve amp when funds permit I thought this would be a good test run to see if I was capable of making a housing for a valve amp home build.
Things turned out *OK, here's how I made the transfer. First off I bought a 2mm stainless steel plate from an online company name Clickmetal, 36mm x 30mm cost £30, of which £10 was postage. Next up I bought from Wickes some architrave (door frame surround) timber; some *10mm x 12mm stripwood to support the plate; a mitre guide block and a fine toothed handsaw.
I made the wood frame, cut holes at the rear for mains socket; phono sockets and loudspeaker terminals. To join the sides together I used just wood glue and one of those picture frame belt clamps (bought a couple cheap at Lidl some time ago), worked fine, turned out nice and square.
I *will at some stage tidy up the output transformer's wiring. I managed to make a couple of marks on the steel plate whilst working on it, one is covered from view by a transformer the other I tried to hide with some wet & dry but didn't entirely succeed.
Here's the steel plate with me testing the component layout:
The original rack case alongside the unfinished new housing:
How the rack case was populated:
Monoblocks taken out of case:
Drilling of the 2mm stainless steel plate. This is tough stuff, wasted a fair few drill bits and Dremel cutters doing this:
Fitted fuse holders; standoffs; neons; switches; tag strip for earth connections *and grommets where leads would pass through under the pcb's:
The underneath view:
Part wired:
Checking I'd wired the switches correctly:
Wiring complete:
Rear connections:
Complete, rear view:
In place in my system:
Front view:
And now, the next project, speed controller # 2:
And now I have the confidence to make a base for a home build SET amplifier I just need to find some pennies for the components, the transformers and chokes alone total £520 so it may be a bit of a wait (SET stands for Single ended triode' where just one valve is used for the main amplifier output. My current amplifiers are known as 'Push-pull' and use a pair of identical valves for the output stage).