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Old 11th March 2011, 09:33 AM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by ostripper View Post
all with MJE340/350's as VAS. These all work and sound exquisite , even with these old devices.
it has nothing to do with "old".
These high capacitance, low gain, slow devices are just not a nice load to hang on the output of a delicate LTP input stage.
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Old 11th March 2011, 01:50 PM   #12
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by ostripper View Post
A little Cob sounds Goooood. Look at all of ampslab's kits , dr. Bora's sigma , and too many other designs to count ... all with MJE340/350's as VAS. These all work and sound exquisite , even with these old devices.


OS
Clearly you are smokin' something in 'da woodz' making a statement like that.

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Old 27th December 2012, 07:05 PM   #13
fab is offline fab  Canada
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Question Best available VAS TO-126 transistor

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Originally Posted by Bonsai View Post
... for VAS transistors. For this function you want devicves with a very low Cob, which these devices dont have. The KSC1381/3503 are good VAS devices.
Hi

Am I smoking too... b/c I can not find VAS transistor in TO-126 with low Cob available from the big trustworthty distributors...They seem all obsolete such as:
sa1209/sc2911
sa1360/sc3423
sa138x/sc350x : I found some but with different HFE range for NPN/PNP and I have mainly symetric VAS...
sa1538/sc3953

What is your recommendation then?

Thanks

Fab
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Old 27th December 2012, 07:18 PM   #14
jaycee is offline jaycee  United Kingdom
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Looks like everything in TO-126 that would be good for VAS is becoming obsolete. Might be time to look at SMD parts in SOT223.

Diodes Inc DZT5401/DZT5551 have my eye at the moment. FZT694B also looks good but there doesnt seem to be a decent PNP complement of it.
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Old 27th December 2012, 07:23 PM   #15
jaycee is offline jaycee  United Kingdom
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Sanyo 2SA1708/2SC4488 also look good, though not sure on the dissipation of that NMP case. 2SA1507/2SC3902 looks like it might be the same die, but in a TO-126ML case.
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Old 27th December 2012, 07:36 PM   #16
fab is offline fab  Canada
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Quote:
Originally Posted by jaycee View Post
Sanyo 2SA1708/2SC4488 also look good, though not sure on the dissipation of that NMP case. 2SA1507/2SC3902 looks like it might be the same die, but in a TO-126ML case.
Thanks ,
but a Cob of 14pf/22pf or even 8.5pf/13pf is too high to my taste...

SMD parts are not practical to mount on heatsinks in my actual pcb. I am really looking for TO-126 ou TO-220 package.

Fab
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Old 28th December 2012, 12:44 AM   #17
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Save a little cash, make up a small stock order and place on Fairchild direct. That's the way I get all the the difficult parts like KSC3503/A1381 and over 12 months, it's still cheaper than messing with distributors.
http://www.fairchildsemi.com/Shoppin...UY&gpn=KSC3503
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Last edited by Ian Finch; 28th December 2012 at 12:47 AM.
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Old 28th December 2012, 06:14 AM   #18
sajti is offline sajti  Hungary
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For driver I use 2SC5171/2SA1930, easily get from Mouser. For VAS my vote is the 2SC3423/2SA1360, but it's hard to get, so KSC3503/KSA1381 is another good option.

Sajti
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Old 28th December 2012, 01:23 PM   #19
fab is offline fab  Canada
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Quote:
Originally Posted by sajti View Post
For driver I use 2SC5171/2SA1930, easily get from Mouser. For VAS my vote is the 2SC3423/2SA1360, but it's hard to get, so KSC3503/KSA1381 is another good option.

Sajti
Quote:
Originally Posted by fab View Post
Hi
Am I smoking too... b/c I can not find VAS transistor in TO-126 with low Cob available from the big trustworthty distributors...They seem all obsolete such as:
sa1209/sc2911
sa1360/sc3423
sa138x/sc350x : I found some but with different HFE range for NPN/PNP and I have mainly symetric VAS...
sa1538/sc3953

What is your recommendation then?
Thanks
Fab
See in bold my previous post...

Thanks
Fab
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Old 28th December 2012, 01:26 PM   #20
fab is offline fab  Canada
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Default VAS

Quote:
Originally Posted by Ian Finch View Post
Save a little cash, make up a small stock order and place on Fairchild direct. That's the way I get all the the difficult parts like KSC3503/A1381 and over 12 months, it's still cheaper than messing with distributors.
My Fairchild
Quote:
Originally Posted by fab View Post
Hi
...
sa138x/sc350x : I found some but with different HFE range for NPN/PNP and I have mainly symetric VAS...

Fab
Thanks for the link but I could not find the option to select the "E" suffix for 100 to 200 HFE range.

Fab
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