Interest for Matched Sets of FQA12P20 / FQA19N20C for F5 Power Amp ? - diyAudio
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Old 2nd May 2013, 07:32 AM   #1
EUVL is offline EUVL  Europe
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Default Interest for Matched Sets of FQA12P20 / FQA19N20C for F5 Power Amp ?

Exactly 5 years ago, we bought some FQA12P20 / FQA19N20C in a GB for our F5 test build :
EU Mini Group Buy FQA19N20C / FQA12P20

They were from Digikey and are still in original Fairchild tubes.

Since then it is well known that we have changed over to the F5X and Toshiba power devices.
We still have 30+ pairs (single point Vgs prematched) left with no use in sight.
So we are happy to let them go to single ended F5 builders who do not like Toshiba's, for whatever reason.

They will be offered as NN / PP matched quads, xen-audio curve tracer matched for both Vgs (<<10mV, normally <5mV)
and Yfs (<<10%, normally < 5%), at 24V 0.3~2.5A, at 65C case temperature.
This represents the exact working conditions of the FETs in a standard F5.

Each subscribers limited to one set (4 FETs NN-PP) per person, unless under-subscribed.
Price depends on curve tracer matching yield, but tentatively 250~300 HKD a set, all inclusive.
(Paypal charges, registered post world wide, etc.)
We do not cover postage losses, as usual.
Delivery some time July 2013, since matching schedule is totally full till then.

Any interest ?


Patrick
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Old 2nd May 2013, 07:35 AM   #2
EUVL is offline EUVL  Europe
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Note that as published in the original F5 thread before, the Fairchild are not complementary devices.
i.e. both the Vgs & Yfs of the N devices differs significantly from the P devices at bias.
As such there is no N-P match possible, by the natural of the FETs.

So the above matching applies to match between devices of the same type.
Hope this is clear to all.


Patrick
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Old 2nd May 2013, 07:53 AM   #3
EUVL is offline EUVL  Europe
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Here the Id vs Vgs curves at room temperature.
Red is N-FET, blue is P-FET.


Patrick
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File Type: png FQA 12P20 19N20C.png (21.2 KB, 681 views)
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Old 2nd May 2013, 01:44 PM   #4
billyk is offline billyk  United States
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Hello Patrick,
I would be in for a set.
Thanks.
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Old 2nd May 2013, 04:54 PM   #5
EUVL is offline EUVL  Europe
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Let's see if there are more :

billyk USA 1 set
....
....


Patrick
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Old 3rd May 2013, 11:17 AM   #6
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Hi Patrick,

As I have a dual output version of the F5, I would be interested in a matched octet of devices matched between types(N-N-N-N and P-P-P-P) if possible. If there is a lot of demand for the devices, I'm sure I could cope with just a quad set:-).

Thanks
Cornelius
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Old 3rd May 2013, 11:46 AM   #7
emyeuoi is offline emyeuoi  Italy
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Hi Patrick,

can you put me in the list? If is possible for 2 Set

Thanks

Enrico
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Old 3rd May 2013, 12:27 PM   #8
EUVL is offline EUVL  Europe
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Please help me to help yourselves by adding to the list :

billyk USA 1 set
vawykca Europe 1 (+1) set (quad is possible)
emyeuoi Asia (?) 1 (+1) set

I shall help with quad sets if available and not over-subscribed.


Patrick
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Old 3rd May 2013, 12:31 PM   #9
emyeuoi is offline emyeuoi  Italy
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Here the list updated:

billyk USA 1 set
vawykca Europe 1 (+1) set (quad is possible)
emyeuoi Asia 1 (+1) set

Thanks

Enrico
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Old 3rd May 2013, 01:49 PM   #10
scalpel is offline scalpel  United Kingdom
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And updated again: billyk USA 1 set. vawykca Europe 1[+1] set [quad is possible]. emyeuoi Asia 1[1set]. scalpel South Africa 2 sets. Thanks Manuel
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