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by Cressy Snr
Fri Mar 08, 2024 9:55 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

It's not cheap, but I think it's worth using.
https://www.wickes.co.uk/Wickes-Metal-P ... m/p/116725
by Cressy Snr
Fri Mar 08, 2024 6:47 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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...
by Cressy Snr
Fri Mar 08, 2024 6:39 pm
Forum: Everyones Projects
Topic: 6550 SE Amplifier
Replies: 110
Views: 9391

Re: 6550 SE Amplifier

Certainly sounded kick-ass on that video. :D
by Cressy Snr
Wed Mar 06, 2024 7:21 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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 ...
by Cressy Snr
Wed Mar 06, 2024 7:16 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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...
by Cressy Snr
Tue Mar 05, 2024 10:49 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

Forgot about the caps being in series making 15uF in total, which puts the 3dB point at 27hz.
by Cressy Snr
Mon Mar 04, 2024 6:28 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

Bit of food for thought there.
by Cressy Snr
Sun Mar 03, 2024 4:32 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

Again, for the sake of completeness:
EL34SEUL.png
EL34SEUL.png (55.19 KiB) Viewed 831 times
KT66 or EL34? Both are good. I prefer the latter, but others might prefer the former. It's all subjective in the end.
by Cressy Snr
Sat Mar 02, 2024 11:14 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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...
by Cressy Snr
Thu Feb 29, 2024 8:36 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4635769

Re: Nothing In Particular

Ya paid ‘ow much?
You were robbed! :D
by Cressy Snr
Thu Feb 29, 2024 8:20 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

OPTs are James 6123HS.
by Cressy Snr
Thu Feb 29, 2024 6:53 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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. :)
by Cressy Snr
Thu Feb 29, 2024 10:12 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4635769

Re: Nothing In Particular

Replaced my shagged out soldering iron yesterday with this cordless iron:
IMG_0357.jpeg
IMG_0357.jpeg (93.47 KiB) Viewed 1351 times
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. :mrgreen:
by Cressy Snr
Thu Feb 29, 2024 9:59 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

For the sake of completion:
KT66SE.png
KT66SE.png (52.17 KiB) Viewed 639 times
KT66SEPSU.png
KT66SEPSU.png (91.06 KiB) Viewed 639 times
by Cressy Snr
Wed Feb 28, 2024 11:39 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 30955

Re: OK…so I’m on wi’ summat

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 ...