2SK408; 2SK409 FETs

A

Andrey

Guest
Hello All,

I am looking for source of 2SK408; 2SK409 FETs

Apreciate any pointers.

Regards,

Andrey
 
www.audiolabga.com has 2SK*** parts but not the particulr two you are after.

Mayb they can source them for you. You can look at the specifications and
see if one of the others would be a suitable replacement.






"Andrey" <a8421@intergate.bc.ca> wrote in message
news:111evk4cvcknr76@corp.supernews.com...
Hello All,

I am looking for source of 2SK408; 2SK409 FETs

Apreciate any pointers.

Regards,

Andrey
Click to expand...
 
Andrey wrote...
I am looking for source of 2SK408; 2SK409 FETs
Click to expand...
Those are old Hitachi (now Renesas) 180V 2A n-channel MOSFETs
meant for use in HF and VHF rf power amplifiers. The '408 had
one package pinout, and the '409 another, likely for push-pull
circuits. Both had their source terminal on the center TAB pin.


--
Thanks,
- Win
 
That's correct - the same parts with different pinouts to lay them one
against another.
The amp I need to re-build has 5 of them in each part of push-pull circuit.

Those are old Hitachi (now Renesas) 180V 2A n-channel MOSFETs
meant for use in HF and VHF rf power amplifiers. The '408 had
one package pinout, and the '409 another, likely for push-pull
circuits. Both had their source terminal on the center TAB pin.


--
Thanks,
- Win
Click to expand...
 
Andrey wrote...
That's correct - the same parts with different pinouts to lay them
one against another. The amp I need to re-build has 5 of them in
each part of push-pull circuit.

Those are old Hitachi (now Renesas) 180V 2A n-channel MOSFETs
meant for use in HF and VHF rf power amplifiers. The '408 had
one package pinout, and the '409 another, likely for push-pull
circuits. Both had their source terminal on the center TAB pin.
Click to expand...
What are the specs (or perhaps I should say, were) of your RF amp?


--
Thanks,
- Win
 
It is "present tense" - there plenty of them sail around the World.

Marine MF/HF Radio - JSS800 from JRC. Power output 250Wt
Result of two such Amplifiers combined. Total # of such transistors -22 (2
in driving pre-amp)


"Winfield Hill" <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote in
message news:cv8dpe029af@drn.newsguy.com...
Andrey wrote...

That's correct - the same parts with different pinouts to lay them
one against another. The amp I need to re-build has 5 of them in
each part of push-pull circuit.

Those are old Hitachi (now Renesas) 180V 2A n-channel MOSFETs
meant for use in HF and VHF rf power amplifiers. The '408 had
one package pinout, and the '409 another, likely for push-pull
circuits. Both had their source terminal on the center TAB pin.

What are the specs (or perhaps I should say, were) of your RF amp?


--
Thanks,
- Win
Click to expand...
 
Andrey wrote...
It is "present tense" - there plenty of them sail around the World.

Marine MF/HF Radio - JSS800 from JRC. Power output 250Wt
Result of two such Amplifiers combined. Total # of such transistors
-22 (2 in driving pre-amp)
Click to expand...
Aren'y you saying it's present tense for other folk's radios, but
past tense for yours? At least until you fix it?

Winfield Hill wrote ...

Those are old Hitachi (now Renesas) 180V 2A n-channel MOSFETs
meant for use in HF and VHF rf power amplifiers. The '408 had
one package pinout, and the '409 another, likely for push-pull
circuits. Both had their source terminal on the center TAB pin.

What are the specs (or perhaps I should say, were) of your RF amp?
Click to expand...
BTW, watch out for NEC's GaAs FETs, which had the same part numbers,
but were microwave transistors in dramatically-different cases.


--
Thanks,
- Win
 
"Winfield Hill" <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote in
message news:cv8se00hho@drn.newsguy.com...
Andrey wrote...

It is "present tense" - there plenty of them sail around the World.

Marine MF/HF Radio - JSS800 from JRC. Power output 250Wt
Result of two such Amplifiers combined. Total # of such transistors
-22 (2 in driving pre-amp)

Aren'y you saying it's present tense for other folk's radios, but
past tense for yours? At least until you fix it?
Click to expand...
I am fixing them - "present continuous tense" - and want to find alternative
source of these transistors.
:)
 
Andrey wrote...
Andrey wrote...

Marine MF/HF Radio - JSS800 from JRC. Power output 250Wt
Result of two such Amplifiers combined. Total # of such
transistors -22 (2 in driving pre-amp)

I am fixing them - "present continuous tense" - and want
to find alternative source of these transistors.
Click to expand...
2SK408 and 2SK409 Hitachi 180V 2A n-channel RF MOSFETs.

Besides the complementary pinouts, the thing that's unusual
about these RF MOSFETs is their high voltage rating. Most
of the RF power MOSFETs I use and come across these days
have much lower voltage ratings. They have quite a bit of
capacitance and so they must be run at low impedances with
transformers or tuned networks to match thir low Z up to the
50-ohm world. As a result they don't need to work at high
voltages. This is true even for moderately high-power RF
transistors. So my question is, what's different in these
transmitters that they need such high-voltage power MOSFETs?


--
Thanks,
- Win
 
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