Source of 'genuine' semiconductors? - UK Vintage Radio Repair and Restoration Discussion Forum

John_BS · 14th Jul 2025, 11:40 am

I recently had to find some obscure power transistors for an AV amplifier. I ended up taking a risk and ordering from this company:
https://alltroniccomputer.com.sg
When they arrived they were checked on a curve-tracer and proved to be genuine parts. They seem to specialise in NOS or similar. Prices are attractive: £9 airmail delivery.
John

Craig Sawyers · 14th Jul 2025, 4:50 pm

Thanks for finding that - saved in favourites having browsed their semiconductor inventory.

Craig

SiriusHardware · 15th Jul 2025, 8:44 am

Yes, looks good - now all we need is a similar source for 1970s / 1980s HF RF output transistors (2SC1909, 2SC2078, 2SC1969), plus the MRFs....

Diabolical Artificer · 19th Jul 2025, 4:24 pm

Smashing, thanks John, looks a cracking source of Q's. £9 shipping, is that post & packing & how long did it take? I've had some nightmares where parcels took months to clear customs.

Andy.

John_BS · 19th Jul 2025, 5:39 pm

Hi Andy: P&P was £9 and I can't remember how long it took, but it wasn't as much as a month. Order value would have been under the VAT threshold.
John

Aub · 20th Jul 2025, 9:49 am

Quote:

Originally Posted by John_BS

I recently had to find some obscure power transistors for an AV amplifier. I ended up taking a risk and ordering from this company:
https://alltroniccomputer.com.sg
When they arrived they were checked on a curve-tracer and proved to be genuine parts. They seem to specialise in NOS or similar. Prices are attractive: £9 airmail delivery.
John

Just out of curiosity I put 2N3055 in their search field and it came up with nothing. Do they really have none?

Aub

bigfathairyvika · 22nd Jul 2025, 10:36 am

Be aware that I've already spotted a few pictures of fake Sanken transistors. It may just be the pictures are of fakes and what you get may be authentic.

John_BS · 22nd Jul 2025, 3:36 pm

These are the ones which tested OK

J

bigfathairyvika · 22nd Jul 2025, 6:02 pm

To clarify, it was the MT 200 package power transistors that I spotted. Obvious from the print not being perfectly straight. I had a set pass through, tested OK on a transistor tester, failed immediately any significant power was applied.
Breaking open the casing revealed a blob of silicon sealant glueing a unknown transistor die to the heatsink.
I contacted Sanken directly and spoke to an advisor who mentioned the print should be perfectly straight.

14th Jul 2025, 11:40 am	#1
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,906	Source of 'genuine' semiconductors? I recently had to find some obscure power transistors for an AV amplifier. I ended up taking a risk and ordering from this company: https://alltroniccomputer.com.sg When they arrived they were checked on a curve-tracer and proved to be genuine parts. They seem to specialise in NOS or similar. Prices are attractive: £9 airmail delivery. John __________________ When you don't know what you are doing, do it neatly.

14th Jul 2025, 4:50 pm	#2
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 5,828	Re: Source of 'genuine' semiconductors? Thanks for finding that - saved in favourites having browsed their semiconductor inventory. Craig __________________ Doomed for a certain term to walk the night

15th Jul 2025, 8:44 am	#3
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 13,685	Re: Source of 'genuine' semiconductors? Yes, looks good - now all we need is a similar source for 1970s / 1980s HF RF output transistors (2SC1909, 2SC2078, 2SC1969), plus the MRFs....

19th Jul 2025, 4:24 pm	#4
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 8,377	Re: Source of 'genuine' semiconductors? Smashing, thanks John, looks a cracking source of Q's. £9 shipping, is that post & packing & how long did it take? I've had some nightmares where parcels took months to clear customs. Andy. __________________ Curiosity hasn't killed this cat...so far.

19th Jul 2025, 5:39 pm	#5
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,906	Re: Source of 'genuine' semiconductors? Hi Andy: P&P was £9 and I can't remember how long it took, but it wasn't as much as a month. Order value would have been under the VAT threshold. John __________________ When you don't know what you are doing, do it neatly.

22nd Jul 2025, 10:36 am	#7
bigfathairyvika Heptode Join Date: Nov 2009 Location: Cambridge, Cambridgeshire, UK. Posts: 556	Re: Source of 'genuine' semiconductors? Be aware that I've already spotted a few pictures of fake Sanken transistors. It may just be the pictures are of fakes and what you get may be authentic.

22nd Jul 2025, 3:36 pm	#8
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,906	Re: Source of 'genuine' semiconductors? These are the ones which tested OK J Attached Thumbnails __________________ When you don't know what you are doing, do it neatly.

22nd Jul 2025, 6:02 pm	#9
bigfathairyvika Heptode Join Date: Nov 2009 Location: Cambridge, Cambridgeshire, UK. Posts: 556	Re: Source of 'genuine' semiconductors? To clarify, it was the MT 200 package power transistors that I spotted. Obvious from the print not being perfectly straight. I had a set pass through, tested OK on a transistor tester, failed immediately any significant power was applied. Breaking open the casing revealed a blob of silicon sealant glueing a unknown transistor die to the heatsink. I contacted Sanken directly and spoke to an advisor who mentioned the print should be perfectly straight.