Inca Tech Claymore repair/update

[Alan Brown]

(Claymore, Claymore 2, Claymore S, IT amplifiers, ID amplifiers, Dirk, Sabre 1 & 2)

Inca Tech Claymore (and others) - update kit which allows replacement FETs or upgrades to current ones - Colin Wonfor has just made these available. You can contact him on AudioChews.

Also some circuit diagrams here: Linky.

Set of four £15 (Sept 2015).

 

[James Evans]

Alan, does that £15 include the fets as well? Thanks for posting the photos, had noticed this update and was wondering what it looked like.

EDIT: (probably just answered my own question by looking up the price of the fets....)

How would you describe the difference/improvement? I have a well bodged claymore here, which may just about stand up to some more bodging...

 

[CJ14]

Alan, does that £15 include the fets as well? Thanks for posting the photos, had noticed this update and was wondering what it looked like.

EDIT: (probably just answered my own question by looking up the price of the fets....)

How would you describe the difference/improvement? I have a well bodged claymore here, which may just about stand up to some more bodging...

Sorry no.
Best Col

 

[CJ14]

Sorry no.
Best Col

There is two type one at 8 Amps and the other at 16 Amps, match pairs of complementary FET's.

http://www.profusionplc.com/pro/gex/product_master?ipartno=ECW20P20-Z
http://www.profusionplc.com/pro/gex/product_master?ipartno=ECW20N20

You need both N and P channel

http://www.profusionplc.com/pro/gex/product_master?ipartno=ECX10P20
http://www.profusionplc.com/pro/gex/product_master?ipartno=ECX10N20

As you will see these is big difference to the old type below.

http://pdf1.alldatasheet.com/datasheet-pdf/view/145810/ETC1/2SK414.html
http://pdf1.alldatasheet.com/datasheet-pdf/view/108045/ETC/2SJ119.html

 

[david ellwood]

I have a length of insulated wire I am happy to sell for half this price which I am happy will do a better job.

 

[PigletsDad]

Basically, the new devices keep their gain at high current, rather than choking off.

 

[russel]

The circuit is based on the 70s Hitachi design which used lateral MOSFETs like the semelab/profusion ones. The 2SK414/J119 are vertical MOSFETs, these have more distortion in the lower current levels, which might be why the new ones, actually one of the oldest MOSFET technologies, sound a bit better.

 

[CJ14]

I have a length of insulated wire I am happy to sell for half this price which I am happy will do a better job.

Look better I think not I have done it it looks shit and can break and has in the past. Oh and wire has no tooling cost, so yep cheap.

 

[CJ14]

Basically, the new devices keep their gain at high current, rather than choking off.

They do indeed but he point of the Thread was to help those with old Claymore to get them fixed, not to replace them for fun and cost.

 

[CJ14]

The circuit is based on the 70s Hitachi design which used lateral MOSFETs like the semelab/profusion ones. The 2SK414/J119 are vertical MOSFETs, these have more distortion in the lower current levels, which might be why the new ones, actually one of the oldest MOSFET technologies, sound a bit better.

Yes the old design I worked on for IR and Hitachi was modified a bit and used in the Claymore and on Magnum designs, original sounded crap cheap and un-musical. After revisiting the design I have done yet a few more changes for the new one coming soon.
I do like K.I.S.S. designs don't you.

 

[cj66]

They do indeed but he point of the Thread was to help those with old Claymore to get them fixed, not to replace them for fun and cost.

Especially when you see jokers like this £60 a set around!

So you're saying if ain't broke...as there would be minimal/no audible advantage?

 

[CJ14]

Especially when you see jokers like this £60 a set around!

So you're saying if ain't broke...as there would be minimal/no audible advantage?

Not good, the new fets do sound better.
And there is a Toshiba version you can use I will find it.

Try these.
http://www.aliexpress.com/item/Free...l-RENESAS-FET-J162-K1058/32423152773.html?s=p

 

[russel]

I do like K.I.S.S. designs don't you.

It depends on how its done, given unlimited budget I would have a simple class A 100 watt amplifier, failing that an amplifier with error correction, which adds complexity but will pass for a hundred watt class A amplifier to my ears.