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Old 14th June 2005, 06:53 AM   #11
palesha is offline palesha  India
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Leolabs say " the obsolute 2SK135/2SJ50 for the output stage"

What to use new one to replace this outdated evices. Any chance of using IRF devices with some modifications?
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Old 14th June 2005, 07:23 AM   #12
Did it Himself
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Exicon and Magnatec make replacement devices. IRF types are not really suitable unless you incorporate a proper thermal tracking system.
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Old 14th June 2005, 10:32 PM   #13
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Thanks, but exactly, where do I have to use the 2SA872 and the 2SB647/2SD667?
example:
T1 = 2SA872
T2 = 2S...

And which benefits done really hand the substitution of the resistors with others of the "metal film" type?

Thanks a lot
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Old 16th June 2005, 01:56 AM   #14
Leolabs is offline Leolabs  Malaysia
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T1=T2=2SA872

T3=2SB647

T4=T5=2SD667

Metal film??Well i havent try.Still to normal stuff
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Old 26th February 2007, 09:03 AM   #15
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Quote:
Originally posted by Leolabs
A quite traditional circuitry.Nothing special but reliable.

I did use the 2SA872 for the input pairs,2SB647/2SD667 for the driver stage,and the obsolute 2SK135/2SJ50 for the output stage.U can try them if u want
Hi

you produced this amplifier?

thx
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Old 6th February 2014, 11:19 PM   #16
esoes is offline esoes  Turkey
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Default FT15K Schematic rev

FT15K Schematic rev.png
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