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Hiraga 20W class A
Hiraga 20W class A
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Old 12th April 2016, 07:45 PM   #1011
xrk971 is offline xrk971  United States
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Hiraga 20W class A
Quote:
Originally Posted by cumbb View Post
Lie around for ten years or more ...
two pairs of "Le Monstre", two pairs of "Le Classe A" and others. A little angle to attach, and they would run. But it hurts my ears, my aesthetic,-)
Do you not listen the difference, clean or less clean,-?

Some suggestions for the origin Classe A:

Replace the big copper strands by solid core, 1,5 mm.
New order of ground an C-R-C - look picture.
Replace the origin bridging cap by x times 220 uF or others, same types! same values! as much as possible.
Input only one channel ground - I prefer right.
Psu - amp: 0,6 mm.
Input - amp: max 0,2 mm.
Amp - output: 0,6 mm.
NO lace! Exept laqueured lace.

... to get a much cleaner, finer sounding origin - or diy - "Le Classe A"-!!!
Are these 3D dead bug amps truly PCB free? Do you have one attached to a heat sink and peripherals like inputs, power, output? It would be cool to see how you manage all that without having something bolted down. Cool looking though.
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Old 12th April 2016, 11:02 PM   #1012
cumbb is offline cumbb
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Truly pcb-free.-) The psus too,-)
But complementary-parts-designs are history.-) Long long ago.
May be, I have some photographs anywhere. I do not know.
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Old 12th April 2016, 11:13 PM   #1013
xrk971 is offline xrk971  United States
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Hiraga 20W class A
Here is a PCB free class D amp with SMT parts.

Click the image to open in full size.
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Old 13th April 2016, 03:53 AM   #1014
damon1983 is offline damon1983  Russian Federation
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Quote:
Originally Posted by AndrewT View Post
Damon,
your left pic shows a twisted triplet feeding each of the output BJTs.

Can you see that?
Black/blue/white to the left BJT and black/red/white to the right BJT.
Aaa. Black=Base, white=emitter, red= + collector, blue= - collector.
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Old 13th April 2016, 06:11 AM   #1015
cumbb is offline cumbb
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I had seen some days ago. Fine work. I had, have similar ideas.
Fine.
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Old 13th April 2016, 07:51 AM   #1016
cumbb is offline cumbb
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Have found pictures. But not a Hiraga. A Aleph 3. 8 years ago? For a friend. But he did not trust in thin diameters - I love thin diameters.-)
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File Type: jpg S6302007.JPG (285.0 KB, 535 views)
File Type: jpg S6302000.JPG (282.2 KB, 523 views)
File Type: jpg S6302003.JPG (281.8 KB, 520 views)
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Old 20th June 2016, 04:14 PM   #1017
SjoerdSmits is offline SjoerdSmits  Netherlands
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Hiraga 20W class A
Guys, someone was saying something about using multiple resistors to get 0.33 or 0.4 ohm..... Can't find that post anymore. But it was supposed to improve the Hiraga a lot. Does anyone get this? And what types should be used? Wirewound?

Thanks!
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Old 21st June 2016, 02:42 AM   #1018
MR Overclock is offline MR Overclock
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Quote:
Originally Posted by SjoerdSmits View Post
Guys, someone was saying something about using multiple resistors to get 0.33 or 0.4 ohm..... Can't find that post anymore. But it was supposed to improve the Hiraga a lot. Does anyone get this? And what types should be used? Wirewound?

Thanks!
You don't nesscilary have to have emitter reistors, you can operate without them
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Old 21st June 2016, 03:36 AM   #1019
sergiu2009 is offline sergiu2009  Romania
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Quote:
Originally Posted by SjoerdSmits View Post
Guys, someone was saying something about using multiple resistors to get 0.33 or 0.4 ohm..... Can't find that post anymore. But it was supposed to improve the Hiraga a lot. Does anyone get this? And what types should be used? Wirewound?

Thanks!
Hi Sjoerd,
Yup, it does improve the sound clarity and other aspects allot and lower the overall noise. To get 0.33 you need to parallel 3 pcs of 1ohm @3w ,metal oxyde. These will get hot even at 3w but acceptable. Or wirewound non inductive types could be used here . I havent tested wirewound n.i. but have tested simple wirewounds and will never go back to them.
Cheers
Sergiu
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Old 21st June 2016, 04:42 AM   #1020
SjoerdSmits is offline SjoerdSmits  Netherlands
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Hi Sergiu, thanks! MOX was the one Hiraga 20W class A I will try that.


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