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Old 23rd December 2012, 11:28 AM   #871
bluevas is offline bluevas  Indonesia
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Hi Dirk,

In my parts, 2SC1775A E grade have Hfe above 550 and 2SA872A E around 450. Try to find 2SA1775A with D grade maybe can match with 2SA872A

Best regards,

Josh
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Old 24th December 2012, 12:31 PM   #872
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My final results...

I used this to measure:

NEWEST Transistor SMD Tester Detector *NPN PNP MOSFET /diode /resistor capacitor | eBay

Results 2SC1775:
Most: 40-300, 4 pieces >450 (all: 24)

Results 2SA872:
Range: 230-250, (all: 25)

Results 2SB716:
Range: 330-350, (all: 25)

Results 2SD756:
Range: 310-420, most near 350, (all: 25)

Results 2SB754:
Range: 180-370, a lot around 280, (all: 19)

Results 2SD844:
Range: 24-81, some around 60, (all: 25)

Well, I feel I should get these:

(20pcs) 2SD844 Original Pulled Toshiba Silicon NPN Power Transistor D844 (20pcs) | eBay

but the seller does not tell me the hfe group.

Anyone who has a lot of 2SD844???

My wishlist:

21 x 2sc1775
25 x 2sa872
6 x 2sb756
25 x 2sd844

This thread said, 2sc2362/2sa1016 and 2sc3423/2sa1360 are perfect replacements for the cascade. If so, where could I source them?

I'm quite sure, bc550/bc560 would maybe be ok.

But: 2SD844 wit hfe < 200 seems worthless...

Please comment / help, part offerings...

Dirk
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Old 24th December 2012, 12:54 PM   #873
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Default L4 Monstre

Try here. They often offer exotic transistors: www.hinkel-elektronik.de
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Old 24th December 2012, 06:01 PM   #874
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Hello
I have at least 40PC 2SA872A E 100% orig. I have to measure them, usually they are between 400-450
All do these bunch I didn't measure them.
I would be interested on trade 2SA872 to 2SC1775 if someone interested
Please ask Dan who built the Hiraga Supper Class A, he also built the Le Monstre and to him some Sanken power transistor sounded better than the Toshiba..
Greetings Gabor
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Old 24th December 2012, 07:40 PM   #875
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Hi, I ordered 2sa872 in the meantime. So only looking for 2sc1775...

Regs, Dirk
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Old 5th January 2013, 03:12 PM   #876
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Taking shape, the wiring is going to be a challenge, now only if that custom R-core would show up soon.
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Old 7th February 2013, 05:13 AM   #877
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I am amazed to see that no one pointed out the missing base to emitter resistors on the output devices. They are necessary to eliminate cross-conduction in output devices.

Lineup, How could you miss that buddy?
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Old 7th February 2013, 11:49 AM   #878
tvi is offline tvi  Australia
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Which emitter to which base?
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Old 7th February 2013, 11:52 AM   #879
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Quote:
Originally Posted by tvi View Post
Which emitter to which base?
Have a look........

Base to Base resistor..........
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Old 7th February 2013, 11:57 AM   #880
lineup is offline lineup  Sweden
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That is the best.
Well done Workhorse.

I have tried with other placement of that resistor. One from each base to output.
And I have tried another alternative.
But a single resistor Base to Base gives lowest distortion.

I suggest one 100 Ohm resistor from base to base.
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