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Old 5th May 2008, 11:17 AM   #11
Quattor is offline Quattor  France
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Also think of Sanyo 2SA1209/2SC2911. In short, TO-126 :: 160V :: 140mA :: 1W :: 150MHz :: 3-4 pF :: hfe 100-400 (groups R, S, T).

And in front of them, try Sanyo 2SA1208/2SC2910, MP :: 160V :: 70mA :: 900mW : 150MHz :: 2-2.5 pF :: hfe 100-400 (groups R, S, T).
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Old 5th May 2008, 12:35 PM   #12
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Another vote for 2sc4793/2SA1837!
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Old 5th May 2008, 01:24 PM   #13
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and another
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Old 5th May 2008, 02:32 PM   #14
wg_ski is offline wg_ski  United States
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Quote:
Originally posted by jacco vermeulen

Only a fool would skip a pre-driver stage on a sick +250W BJT amp, therefore the high capacitance of the driver is not an issue.
Tell that to the "fools" that sell pro amps commercially. The ones with only two stages of current gain driven directly by an op-amp. Running out of beta appears to be a perfectly valid short term current limiting mechanism.

I for one thought the C5200/A1943 *were* drivers - for a stack of MJL's . For pre-drivers I like the C4793/1837 or the C2344/A1011 (which are getting hard to find).

And anyone who uses TIP devices to drive sustained-beta outputs (of any type) needs to have their head examined. Sort of defeats the purpose....
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Old 5th May 2008, 08:36 PM   #15
roender is offline roender  Romania
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MJE15034/15035, true hfe and ft pears
hfe 200 at Ic=80mA, Vce=20V (tested)
ft 60Mhz at Ic=80mA, Vce=20V (tested)
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Old 5th May 2008, 09:13 PM   #16
Shaun is offline Shaun  South Africa
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I'd like to cobble together a 200-300W/8R amp using LME49811TB chip. I have MJE15034, MJE15035 and MJL4302A, MJL4281A. Will these fly?
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Old 5th May 2008, 09:22 PM   #17
Nordic is offline Nordic  South Africa
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Hey Shaun, I have a built up DX precision board you are welcome to audition for a while and test your output transistors on... I'd like to get some input on how it performs with other outputs... It will fall just a bit short of your 200W into 8 ohm requirement, but this thing is a beast... I think it will still eat 300W speakers... You know where I stay... and how to contact me... you will need supplies in the range of about 2x45VAC or a centretapped 90VAC one... I did test the board on about 50VAC per rail.
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Old 5th May 2008, 09:39 PM   #18
Shaun is offline Shaun  South Africa
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I think this amp concept will be the last amp I work on for a while (but not anytime soon). I just got myself a pair of Denon POA-6600 monoblocks tonight, and I'm rather enjoying them. Why don't I lend you my Load Invariant amps, and you can do a comparison with the DX? I actually want to wean myself off amp building to concentrate on speaker building (even though I have a string of electronics projects I could be doing).

I know someone who might be interested in auditioning your DX amp (say, over a weekend). Do you have any completed?
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Old 5th May 2008, 09:57 PM   #19
sandyK is offline sandyK  Australia
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Default Driver transistors for 2SC5200&1943

ttan98
Have you investigated the Toshiba 2SA1930 and 2SC5171 ? They are superb driver transistors and also available from suppliers such as RS Components for a little over $1 each.

SandyK
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Old 5th May 2008, 09:57 PM   #20
Nordic is offline Nordic  South Africa
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Well, I only have one channel of the precision ready... needs a PSU as I used my HRII supply to run it off... I need to make my PSU a little more user safe, then I will arrange for you to get the HRII to from me..., freshly modified on Sunday, but I want to dail back the modification just a little bit... just have to swap out two resistors but my cube case is susch a big job to work on.

I'd also like to get involved with some speaker building, but am only finding run of the mill inefficient speakers around here... Jose's stuff is OK though, I want to get some of those potted midranges he has.
This weekend is full, but maybe we can make an afternoon of some auditioning next weekend...
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