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Old 24th May 2003, 02:14 PM   #31
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Default 2SB649/2SD669

Wow guys, looks like you get electronic components very much cheaper in the States.

BTW, I'm looking for some obsolete RCA40410 that comes with heatsinks attached. Anybody have these for sale??

ckt.
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Old 24th May 2003, 05:46 PM   #32
mcp is offline mcp  United States
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Default RCA40410

Quote:
originally posted by diyman
BTW, I'm looking for some obsolete RCA40410 that comes with heatsinks attached.
It may be your lucky day. Let me check my stocks tomorrow. I know I have some with nice squarish heatsinks built-in. In the tube world, it's called NOS.

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Old 25th May 2003, 04:51 AM   #33
mcp is offline mcp  United States
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Hi diyman

I only have 4 pcs of RCA40410 and RCA40409.

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Old 26th May 2003, 12:29 AM   #34
sam9 is offline sam9  United States
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I have just used Christer's home brew spice models for the 2sd669/2sb649 in a SIMetrix model of one of Slone's amps. I substituted the models for 3 or four other types previosly discused as substitutes. I use SIMetrix's FFT facility to look at the predicted 2nd, 3rd, 4th ... harmonics. If the models are to be trusted, it makes very little difference which of the alternative transistors are used. I didn't need to be too precise in reading the graph to see that in all the casaes the THD was going to calculate out with riduculously many leading zeros after the decimal!

I seem to recall that Slone says in one of his books that he designs with the intent that only ordinary components are required to get the performance levels claimed. For instance, he even suggests that 5% carbon film resistors are good enough.
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Old 2nd July 2003, 10:17 AM   #35
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Default HIT devices now out of production

the Hitachi 2sd669/2sb649 are now out of production. I am going to check out a competitive brand and compare with my curve tracer. I will let everyone know and post the results here.
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Old 2nd July 2003, 04:28 PM   #36
sam9 is offline sam9  United States
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To Jackinnj,

In your checking keep an eye out for 2SA1220/2SC2690 as well. I think (but I'm not sure) that hey are nearly/virtually the same as as the 669/649's. Fairchild makes some in Korea except that the "2" prefix is replaced by "K".

Neither seem to be available in North America except in large quantities direct from Fairchild.
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Old 7th June 2004, 02:36 AM   #37
thanh is offline thanh  Viet Nam
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Quote:
.model 2SD669 NPN (IS=5p NF=1 BF=250 ISE=5p NE=1.5 IKF=3 VAF=150 RB=1 RC=0.25 RE=0.25 TF=1.14ns CJC=50p )
.model 2SB649 PNP (IS=5p NF=1 BF=250 ISE=10p NE=1.5 IKF=3 VAF=75 RB=1 RC=0.25 RE=0.25 TF=1.14ns CJC=50p )
.model 2SC4793 NPN (IS=0.1p BF=130 NF=1 ISE=0.1p RB=1 RE=0.1 RC=0.2 VAF=500 IKF=3 TF=1.6ns CJC=100p )
.model 2SA1837 PNP (IS=0.1p BF=130 NF=1 ISE=0.1p RB=1 RE=0.1 RC=0.2 VAF=500 IKF=3 TF=2.28n CJC=150p
Are these models used for Multisim? I use Orcad.
Who can tell me the site to download multisim 2001 free ?
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Old 7th June 2004, 03:15 AM   #38
sam9 is offline sam9  United States
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They should be usable in any Spice simulation program
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Old 20th June 2004, 02:59 PM   #39
jmateus is offline jmateus  United States
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Default CF amplifier from Slone-Seal Elect.

To Sound Boy

I just to let you know that I built two monoblock vesions of
Mr. Slone's CF amplifier.
Only to say that this the most sensational amplifier that I ever
built, and there are many!...
I'm a tube sound lover and I have several amps that I built/
rebilt but let me tell you Mr. Slone's design as far as the sound
goes is very, very comparable to the tube sound.
The two monoblocks I built are the best SS amplifiers I own.
The sound is smoot, detailed and the bass are powerful the
mid and treble are detailed with no harshness whatsoever.
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JLH 2005, Cyrus and so on...
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Old 20th June 2004, 06:43 PM   #40
sam9 is offline sam9  United States
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" Mr. Slone's design as far as the sound goes is very, very comparable to the tube sound"

If you read the intro to his Amplifier Construction book you might conclude he would be diappointed or even a little insulted by such praise. He would never say so himself, of course, except in the kindest and most diplomatic manner.
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