Source for 2SC2240 GR/BL & 2SA970

david winter

david winter

Classical music lover.
Hi,

My source for original Thoshiba 2SC2240 (GR, BL) and 2SA970 can't provide them at the moment.
Anyone can point me to a reliable source ?
I have one Sansui to finish which needs at least 16 2SC2240 (8 GR and 8 BL) but I could need a bit more for a few other amps depending on how many can be supplied.
Of course I checked on the bay but most are from China (doubtful).

Thanks !
 
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david winter said:
Hi,

My source for original Thoshiba 2SC2240 (GR, BL) and 2SA970 can't provide them at the moment.
Anyone can point me to a reliable source ?
I have one Sansui to finish which needs at least 16 2SC2240 (8 GR and 8 BL) but I could need a bit more for a few other amps depending on how many can be supplied.
Of course I checked on the bay but most are from China (doubtful).

Thanks !
Click to expand...
Have you looked at the 2N5551C (center collector)? https://datasheetspdf.com/pdf-file/1018576/KEC/2N5551C/1
 
There are smd versions that in some locations could be used instead of the through hole part.
Please take a look at the toshiba 2sa1312bl and 2sc3324bl
in some apications they will not be adequate because of their lower power dissipation.
Other alternatives that may still be available are the KEC KTC3200 and the KTA1268, and the 2SC2459 and the 2SA1049 also made by toshiba which are equivalent to the 2sc2240/2sa970.
 
sa970 and sc2240 are 17 eurocents at Reichelt
Brand is CDIL (from India)
At least better than paying a ridiculous price for a small signal transistor.

(to my country shipping is usually 7 euros total for a parts order or alike, I do not know if that changed due covid. If buying at Reichelt, always order their catalog book also as it comes free with the order)

I bought a few once , but never compared them with originals (for noise) yet.
 
Thanks for your replies.
Right now I prefer finding 2240 / 970 as I don't know whether other substitutes will have the same low noise and provide the same sound quality (unless one of you made blind tests to see whether there was a noticeable difference).
Moreover, the amplifier I'm currently working on uses both GR & BL types. Both tone control boards have four of each (eight total). Not sure that a same substitute will replace both without audible changes. Let me know.
 
I have plenty and could use them as I often do, but the 1845 doesn't sound as good as the 2240 and doesn't have the 500+ gain required in some cases.
 
If your "2240 / 970" are so good why are you replacing them?
You can hear the difference between a "c2240 / a970" & "c1845 / a992, now that is a talent I can not compete against :)
We are using 2n5551/5401 in our power amp designs, amazing what performance you can get out of a 50 year old el cheapo transistor.
Your 2sc3324/a1312 are your modern day equivalents.
 
rcs16 said:
If your "2240 / 970" are so good why are you replacing them?
You can hear the difference between a "c2240 / a970" & "c1845 / a992, now that is a talent I can not compete against :)
We are using 2n5551/5401 in our power amp designs, amazing what performance you can get out of a 50 year old el cheapo transistor.
Your 2sc3324/a1312 are your modern day equivalents.
Click to expand...
Here's the data sheet. And what is cool, the adapters are readily available for through-hole retrofit. And you can always use a tiny dab of thermal epoxy to attach a heat sink if need be.
https://www.mouser.com/datasheet/2/408/2SC3324_datasheet_en_20140301-1150780.pdf
 
Onsemi has fjv1845/992 as their sot-23 version too. They have the process down pat in that they only offer one hfe grade because the hfe range is so small
 
rcs16 said:
If your "2240 / 970" are so good why are you replacing them?
You can hear the difference between a "c2240 / a970" & "c1845 / a992, now that is a talent I can not compete against :)
We are using 2n5551/5401 in our power amp designs, amazing what performance you can get out of a 50 year old el cheapo transistor.
Your 2sc3324/a1312 are your modern day equivalents.
Click to expand...

I'm not replacing 2240/970 but 871 which have lost gain (some under 200) and are known to cause various troubles.
If the amp had 2240/970 I'd have saved some time leaving them in ! :)
 
rcs16 said:
Onsemi has fjv1845/992 as their sot-23 version too. They have the process down pat in that they only offer one hfe grade because the hfe range is so small
Click to expand...

I never tried this version. From the specs the Hfe ranges from minimum 150-200 to 580-600 typical to 1200 maximum, which is quite large.
The typical gain seems to match the 871, at least for those with the Sansui "red dot". Not sure if others could be replaced by equallky high gain.
Not sure either what gain range is available from Mouser if several exist.


Skywatcher said:
Here's the data sheet. And what is cool, the adapters are readily available for through-hole retrofit. And you can always use a tiny dab of thermal epoxy to attach a heat sink if need be.
https://www.mouser.com/datasheet/2/408/2SC3324_datasheet_en_20140301-1150780.pdf
Click to expand...

Seems to be a nice replacement, but more labor. I'll keep this solution in mind ; thanks for this hint:)
 
david winter said:
I never tried this version. From the specs the Hfe ranges from minimum 150-200 to 580-600 typical to 1200 maximum, which is quite large
Click to expand...
That is a very old spec, showing the process variation, from inception, basically to match the original NEC spec that they cloned. They only sell "F" ranked parts, have for a few years now. The matching on a reel is very tight. No need to test in many cases for a diff pair.
 
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