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Old 22nd August 2009, 03:11 AM   #411
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mindengine,
the 2SC2342/2SA1358 was not a very good choice.
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Old 22nd August 2009, 08:02 AM   #412
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then what is promising for this Tr.
2sc2341 /1358 is relatively easy to choice for 2sc5200(toshiba) , 2sc2922 (sanken) .
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Old 22nd August 2009, 11:46 AM   #413
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Quote:
Originally Posted by colin.hepburn2 View Post
Hi All
OK I'm new to this amp so hope some one can help me I have just got a set of the hiraga LE monster PCBs for the 15 watt version but I will be building the 8 watt version first I know some of the transistors are difficult to get now but I have a list of replacements can anyone confirm if there are correct
2SJ74
PFET TO92 SGD P Channel FET 50V Idss=1.2Ma Suggested Equivalent2SJ103

2SK170BL
NFET TO92 DGS 40V 20mA Idss=1Ma Suggested Equivalent2SK170
2SC1775
NPN TO92 ECB 120V 50mA 200MHz Suggested Equivalent 2SC1775A
2SA872
PNP TO92 ECB 120V 50mA 120MHz Suggested Equivalent 2SA872A
2SB716
PNP TO92 ECB Suggested Equivalent: 2SB647
2SD756

NPN TO92 ECB 150V 50mA 1W 160MHz Suggested Equivalent2SC2632
Output trans
2SB754/2SD844 Equivalent unkown
See parts list and sch for 15 watter
Hi All
We seem to drifted way from what I am trying to find out
the Transistors I have listed here are the originals for the 8watt hirage the equivalents listed are the ones I can still get hold of but I just want to confirm if there are the correct replacements for the originals
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Old 23rd August 2009, 08:21 AM   #414
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colin.hepburn2,
2SK170BL/2SJ74BL instead of GR is no problem, I would definitely try the 2SK246/2SJ103.
2SC1775/ 2SA872 "A" only indicates a higher voltage rating.
The 2SD667/2SB647 and the 2SC2342/2SA1358 are not suitable (intended for current amplification), 2SC2632/2SA1124 is OK.
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Old 23rd August 2009, 12:03 PM   #415
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Default Interesting that in the simulator it does not behave fine

And several folks say it sounds nice.

This confirms, once more, that simulator results does not match listening tests...or, as another option, people is biased and do not even compare to know if it really beat others or not.

I have build several years ago and i dislike it a lot... sounded not fine, despite i like some JLH models that operates in class A too.

Now, reading thread, i have simulated all options, and found them not fine, into fourier many behave bad, distortion levels (THD) is higher than normal, simple, standard and common cheap AB amplifiers.

I have now tested the last circuit published, and i could not see (numbers) good results.

The best one (into simulator) was the one operates with 35 volts

regards,

Carlos
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Old 24th August 2009, 04:30 AM   #416
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Charlie,
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This confirms, once more, that simulator results does not match listening tests...[/
After having built 4000 amplifiers, maybe its time for drawing conclusions. Your eyes can see now that gleam of light far away, taking you closer to the moment of salvation: it would have been better to build just one, a good sounding one with terrible measurements.
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Old 24th August 2009, 03:00 PM   #417
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Originally Posted by Lumba Ogir View Post
colin.hepburn2,
2SK170BL/2SJ74BL instead of GR is no problem, I would definitely try the 2SK246/2SJ103.
2SC1775/ 2SA872 "A" only indicates a higher voltage rating.
The 2SD667/2SB647 and the 2SC2342/2SA1358 are not suitable (intended for current amplification), 2SC2632/2SA1124 is OK.
OK so the following transistors are good for 8 watt hiraga yes
2SK246/2SJ103
2SC1775/ 2SA872
2SC2632/2SA1124
Which output Trans are recommended in place of the original 2SD844 /2SB754
Found this pair 2SD718/2SB688 120V 8A 80W HI-FI compliment to 2SD718 would these be ok as the output Trans
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Old 24th August 2009, 08:53 PM   #418
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Found this pair 2SD718/2SB688
Is it genuine Toshiba???
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Old 24th August 2009, 09:10 PM   #419
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Originally Posted by Lumba Ogir View Post
Is it genuine Toshiba???

Is it genuine Toshiba
Hadnít though of that no itís not but dose it really matter see data sheet
http://www.datasheetcatalog.com/data...7/2SD718.shtml
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Old 24th August 2009, 09:24 PM   #420
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colin.hepburn2,
I consider it an unreliable fake, don`t trust the specifications.
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