suitable equivalent to mjl21193/4

[csl113]

i need a suitable equivalent to mjl21193/4,but something cheaper.........200W,250V,16A.....

it is to be used in a amp,(+- 90V,but i think i will increasse it to 100V...)

[MikeB]

Hmm, i think mjl21193/4 is already best choice, cheaper transistors
have smaller SOA, means you need more of them !
At these high voltages there are not many alternatives.
And don't forget, costs for electronic devices are very small compared
to heatsink, transformer and psu-caps !
If cost is a problem, try less power and you will need less transistors,
smaller caps,smaller heatsink and smaller/cheaper caps !
With a 100watts into 8 ohm you can live with a single pair of the mjl's.

You could use the mj21193/4 in TO3-case, it's might be slightly cheaper.

Mike

[csl113]

i found 2sa1295/2sc3264 that seems to be almost the same specifications,200W,230V,17A...

will these work as good as the mjl's?

[MikeB]

Yes, these are very good devices, but don't look at these watt-ratings,
(200W,230v,17a), you must look to the SOA-chart with the second
breakdown.
But make sure you really get original sankens, or they will pop.
Aren't these more expensive than MJL21193/4 ?

Mike

[djk]

SOA at 100V is better on the ON parts.

If you're going to run ±100V at 4 ohms I would run at least 6 pair of the ON, or 8 pair of the Sanken.

[csl113]

i found 2sa1295/2sc3264 (the real thing),and it's about 35-40% cheaper then the mjl....so i'l go with 2sa1295/2sc3264....

thankyou all for your help

[jdoorn]

Originally posted by djk
SOA at 100V is better on the ON parts.

If you're going to run ±100V at 4 ohms I would run at least 6 pair of the ON, or 8 pair of the Sanken.

It is hard to compare SOA's charts, so I was wandering if the SOA is better on the MJL21193/94.
SOA on the Sanken is specified at DC and 10ms, on the MJL21193/94 at 1sec...

But if I compare the Sanken with the SOA charts of the MJL21195/96 ,which are also specified at 10ms, it seems that the SOA at 10ms is better on the Sanken.
Or am I wrong on this ?

Jan

[djk]

Think about it.

10mS SOA specs are pointless for audio, only 1S or DC mean anything.

[AndrewT]

Hi,
correct me if I am wrong but I believe that SOA are for one off events. So 10ms must not repeat within a sensible period say a couple of seconds. This would not suit music peaks which are liable to repeat frequently. Similarly even the 100ms and 1s (but now the repeat time is extended to many seconds) figures must not repeat too close together. Safer to use the DC figures if the manufacturer quotes them.
regards Andrew T.

[Eva]

Extrapolating the graphs, I think MJL DC SOA is almost the same as Sanken's SOA up to 100V. Above 100V MJL show better SOA

But Sanken's feature much less charge storage [Ft is 10 times higher] and higher current gain at the same time [sometimes twice the gain of MJLs]

I think Sanken's look more like linear amplifier transistors while MJLs look more like high voltage low gain switching transistors

PD: This handful of Sankens are all fakes, be careful...