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Old 18th December 2012, 04:55 AM   #351
wahab is offline wahab  Algeria
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Large signal mode sim using a 5Khz sine surimposed with a 100KHZ square
signal at 4/1 ratio, quite a stressfull test to check unstabilities that can occur
at some specifics output levels.

The imperfection in the curve are due to the conversion from EMF to GIF ,
otherwise everything is straight...
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File Type: gif HITACHI FFET MOD5.5 LSM.gif (27.7 KB, 389 views)
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Old 18th December 2012, 08:52 AM   #352
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Hi Wahab ,

I did Goldmund clone 9.2 which frankly are very pleased.
But I am very curious to try your scheme
Please tell me if I can use without modification 2n5565 and 2sk176/2sj56.

Thank you!
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Old 18th December 2012, 09:19 AM   #353
wahab is offline wahab  Algeria
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Hi Vitalica ,

.
For the input stage it s better to stick with the 2SK170 , the 2N is not as good,
it suit better the GM since its limited transconductance is part of the design stability ,
but for this amp that is stabilized for a higher feedback it would just degrade the perfs.
Other models are possible , though , i ll check and post my findings soon.

In contrast , the 2SJ56/K176 suit perfectly this amp , of course , it is likely
that they are even better than the 2SJ162/K1058 but as you can see , Gabors
PCB suit the latter so you ll have to either mod it or mod Alex s PCB wich is more
complex to implement if home made.

Btw , your amp is nicely built...

Last edited by wahab; 18th December 2012 at 09:24 AM.
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Old 18th December 2012, 11:08 AM   #354
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Thank you very much ,Wahab
I'll talk to Alex mm, can help me change a little PCB.
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Old 18th December 2012, 05:38 PM   #355
wahab is offline wahab  Algeria
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An exemple of the test above with a comparison between this amp
and another one that i took randomly from the forum.

First picture show the two curves , with Gabor amp s having
slightly higher power output so we can differentiate them clearly when
zooming , first a part of the positive side and then the negative
side of the signal.

The test clearly show little glitches with the amp X that are due
to a compensation that is not accurate although i improved it slightly ,
otherwise the curve would really look ugly.

Thoses glitches would be likely not observable with a single pulse
that swing the same total amplitude.
Attached Images
File Type: gif HITACHI FFET MOD5.5 LSM5100A.gif (29.6 KB, 340 views)
File Type: gif HITACHI FFET MOD5.5 LSM5100B.gif (21.4 KB, 301 views)
File Type: gif HITACHI FFET MOD5.5 LSM5100C.gif (23.7 KB, 292 views)
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Old 18th December 2012, 08:12 PM   #356
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I think that open loop gain is changing with output swing voltage ( decreasing ). It may to originate that glitches. You can to see it happens only near the peak output.
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Old 19th December 2012, 12:03 AM   #357
wahab is offline wahab  Algeria
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Quite possible , i still didnt investigate the thing since i discovered
this behaviour only when performing this sim recently.

That said , dont pay too much attention to the full amplitude graph
as the image converter EMF/GIF distort the picture hugely.
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Old 19th December 2012, 06:48 PM   #358
alex mm is offline alex mm  Europe
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Old 20th December 2012, 03:51 PM   #359
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I am very impressed Thanks Alex, I love it!
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Old 12th January 2013, 01:58 PM   #360
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So has anyone built this amp and listened to it ?
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