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F5Turbo Illustrated Build Guide
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Old 13th March 2018, 11:33 PM   #391
PDL is offline PDL  United States
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Angled aluminum would be my first choice as well.
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Old 13th March 2018, 11:39 PM   #392
6L6 is offline 6L6  United States
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Looks really good!

Honestly, I'd save one transformer and PSU board for a different amplifier -

Nobody builds just one...
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Old 13th March 2018, 11:45 PM   #393
6L6 is offline 6L6  United States
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Alex, sorry, I just now saw these questions...

Quote:
Originally Posted by alexkosha View Post
Not yet.... It is behaving very nice, so far.
No oscillations observed, but I use Toshiba MOSFETs.
If it oscillates you'd know as it burns up the output devices instantly.

Quote:
Can you please describe again (or direct me to the relevant thread) all confederations behind usage of cascoded JFETs?
Advantages are that you can run higher voltage rails, and get more power, without harming the Jfets. The Cascode keeps the total Jfet voltage within their safe range.
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Old 14th March 2018, 02:50 AM   #394
AudioSan is offline AudioSan  Norway
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I would also saved one transformer for another build. or used 2pc 300-500VA transformers. And i would mount the transformers in the front of the chassis, not in the back of it. And mount the speakerprotection board(s) on the back panel.
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Old 14th March 2018, 02:53 AM   #395
luvdunhill is offline luvdunhill  United States
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I would put the transformers towards the front of the case - not near the input/output jacks
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Old 14th March 2018, 06:22 AM   #396
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ah , yeah !

just swap front and back plates
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Old 16th March 2018, 05:16 AM   #397
alexkosha is offline alexkosha  United States
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Quote:
Originally Posted by 6L6 View Post
Alex, sorry, I just now saw these questions...


If it oscillates you'd know as it burns up the output devices instantly.


Advantages are that you can run higher voltage rails, and get more power, without harming the Jfets. The Cascode keeps the total Jfet voltage within their safe range.


Hi Jim,
Thank you a lot.
Yep, no oscillations and all is great.
I targeted for 32VDC for PSU and replaced transformer for 25V instead of previously used 24V. Same Antek, but 25VDC out. Unfortunately, I did not get targeted 32VDC. Have about 28-29VDC depend to main fluctuations during day time. My line also a bit sagging when both mono locks and the rest of gear are on. Main is drops to 116-117VAC from 119-120.
Have question about speaker protection devices that guys were talking here. I have stereotype (I thing as read some articles in the past about this subject) that all types of active speaker protection staff is degrading SQ. So, use CL-60 only for inrush and nothing else. Does it make sense to try some more protection for speakers against short? Any advice for specific one? Or not to wary about that at all? Thank you again.

Last edited by 6L6; 16th March 2018 at 12:32 PM. Reason: formatting
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Old 16th March 2018, 12:33 PM   #398
6L6 is offline 6L6  United States
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I don't think the diyA speaker protection board is audible, the only thing added to the signal path is 2 relay contacts...
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Old 16th March 2018, 06:56 PM   #399
alexkosha is offline alexkosha  United States
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Quote:
Originally Posted by 6L6 View Post
I don't think the diyA speaker protection board is audible, the only thing added to the signal path is 2 relay contacts...


Can you please send me a link to it? Iíll might need to add that feature to my amps.
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Old 16th March 2018, 06:57 PM   #400
6L6 is offline 6L6  United States
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Soft Start & Speaker Turn-On Delay / DC Protector Combo – diyAudio Store
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