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Forum: Project Logs 21-10-20, 09:45 PM
Replies: 17
Views: 894
Posted By Kei
Much sanding and polishing later... ...

Much sanding and polishing later...
https://live.staticflickr.com/65535/50512761232_530ee86770_h.jpg

https://live.staticflickr.com/65535/50514471801_a31a7e11b3_h.jpg (https://flic.kr/p/2jXMSyZ)
...
Forum: Project Logs 19-10-20, 10:11 PM
Replies: 17
Views: 894
Posted By Kei
It is a tad large and heavy. To get a stereo...

It is a tad large and heavy. To get a stereo pair, it'll weigh around 25Kg.

Sorted the turret boards today.
https://live.staticflickr.com/65535/50507416917_00b8d648c9_h.jpg...
Forum: Project Logs 18-10-20, 10:50 PM
Replies: 17
Views: 894
Posted By Kei
More progress today. All holes now drilled and...

More progress today. All holes now drilled and countersunk. I quickly found that I had undersized the holes for the cable grommets by 2mm so need to sort that tomorrow....
Forum: Project Logs 17-10-20, 09:21 PM
Replies: 17
Views: 894
Posted By Kei
I've now deconstructed the first amp I built so...

I've now deconstructed the first amp I built so that I can rebuild it as the Mk4. It's surprising just how quickly I took the whole thing to bits. 1.5 hours and it was done. I swear it took me over a...
Forum: Project Logs 17-10-20, 05:45 PM
Replies: 17
Views: 894
Posted By Kei
I've started construction of a Mk IV amp which...

I've started construction of a Mk IV amp which shrinks the overall package down. The Mk III underneath is the same size aluminium sheet, 19"x10.5" down to 15"x9.5". Even though the overall chassis...
Forum: Project Logs 17-09-20, 08:47 PM
Replies: 17
Views: 894
Posted By Kei
After much testing, I came to the conclusion that...

After much testing, I came to the conclusion that although the amp sounded great, it had one issue; too much gain. The open loop gain was at 49.54dB and closed loop was 33.26dB. The problem this...
Forum: Project Logs 29-08-20, 09:22 PM
Replies: 17
Views: 894
Posted By Kei
I've been using it regularly since the start of...

I've been using it regularly since the start of August and it's been running great. It sounds superb. It's surprising just how loud 20-30W is capable of. Having resampled all of the valves, at best,...
Forum: Project Logs 13-08-20, 09:35 PM
Replies: 17
Views: 894
Posted By Kei
Fitted the Electro-Harmonix 6CA7's today and am...

Fitted the Electro-Harmonix 6CA7's today and am giving it a test. I think it may be my imagination but it definitely seems to sound a bit better. I think there may be more gain or something, but...
Forum: Project Logs 10-08-20, 07:44 PM
Replies: 17
Views: 894
Posted By Kei
Closing the feedback loop didn't entirely go to...

Closing the feedback loop didn't entirely go to plan as the usual feedback issues returned. However, things were not as bad as they had been with the previous builds.

The usual 58ish KHz ringing...
Forum: Project Logs 08-08-20, 08:11 PM
Replies: 17
Views: 894
Posted By Kei
Thanks. It's proven to be a much bigger challenge...

Thanks. It's proven to be a much bigger challenge than I originally expected.

First testing wan't entirely to plan as I quickly discovered I'd got the pinout of the transistor in the CCS...
Forum: Project Logs 08-08-20, 09:56 AM
Replies: 17
Views: 894
Posted By Kei
Decided to have a rejig this time and move the...

Decided to have a rejig this time and move the capacitors about and also have a partition between the power supply and the amplifier.
https://live.staticflickr.com/65535/50037652793_3efb70d96f_h.jpg...
Forum: Project Logs 07-08-20, 04:28 PM
Replies: 17
Views: 894
Posted By Kei
Made a start on the metal prototype build by...

Made a start on the metal prototype build by re-purposing a 6U rack blanking cover to make the top panel. After plenty of drilling and punching the larger holes out I was left with this. Layout...
Forum: Project Logs 06-08-20, 07:08 PM
Replies: 17
Views: 894
Posted By Kei
Cue the Mk 2 Version...When all else fails, do it...

Cue the Mk 2 Version...When all else fails, do it by the book. This is pretty much as close to the book layout as I could get. I had to fiddle about with the two capacitors that live between the...
Forum: Project Logs 06-08-20, 06:42 PM
Replies: 17
Views: 894
Posted By Kei
Scratch Build Tube Amplifier

...or Valve amp if you're British. Those from OCUK may recognise this. It will be the abridged version rather than the entire saga. That said, even OCUK got a more brief version compared to the poor...
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