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Post by Mr Whippy on Nov 12, 2016 12:18:46 GMT
Is it really worth the hassle of trying to find them, pay the price asked and wonder if they really are what is claimed, and not counterfeit, or just use an alternative?
Looking for 2SC1116A/2SA747A output pairs which were commonly used in amps in the '70s and not to be found now.
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Post by pre65 on Nov 12, 2016 13:08:33 GMT
Go for modern replacements, but change the whole set so they all match.
Buying electronics on Ebay can be a lottery re counterfeit parts. 
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Post by Deleted on Nov 12, 2016 18:13:27 GMT
Aye 'T03' are proper Transistors.. I replaced the Output transistors in both my Quad '303' & Ferrograph 'F307' with modern equivalent.. Improvement was had on both accounts.
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Post by Mr Whippy on Nov 12, 2016 18:52:53 GMT
Improvements? In what sense?
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Post by Deleted on Nov 12, 2016 19:40:44 GMT
I was referin' ter Technical Improvements not sound wise.
Not a fan of Silicon Transistors, prefer the sound of Germanium.
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Post by Deleted on Nov 12, 2016 19:59:05 GMT
Check these two out
NTE284 [2SC1116A]
NTE281 [2SA747A]
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Post by MartinT on Nov 12, 2016 21:59:36 GMT
TO3 refers to the case design. Some of the best TO3 power transistors I ever used are BDY56 from the Linsley-Hood 75W design. Virtually bomb-proof trannies with good performance in a quasi-complimentary circuit.
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Post by Deleted on Nov 12, 2016 22:07:14 GMT
TO3 refers to the case design. Some of the best TO3 power transistors I ever used are BDY56 from the Linsley-Hood 75W design. Virtually bomb-proof trannies with good performance in a quasi-complimentary circuit. Tis the case design. I modified my old Quad '303' output stage from Quazi Complimentary to Fully Complimentary.. I would never dream of farting about like this these days.. |
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Post by Mr Whippy on Nov 13, 2016 0:42:46 GMT
Was it worth the effort? I have a NAD 3030 (2, actually,) with 2N3055s on the output, the same as the 3020. And yet on the circuit in the service manual it shows a MJ complementary pair.
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Post by Deleted on Nov 13, 2016 20:41:17 GMT
Yes cos there is no need for Quazi anymore.
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Post by MartinT on Nov 13, 2016 22:20:37 GMT
Indeed, PNP transistors can now be made with the same current handling as NPN, which didn't used to be the case.
I know you could get MJ3055 which were the NPN in a TO3P package. MJ2955 would have been the PNP equivalent (from memory).
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Post by Deleted on Jan 30, 2017 16:17:20 GMT
Hi Chap's I am trying a few odds and sod from this company only small amps (oh yer) unitedsic.com/ |
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