Japanese transistor pinouts, 2SA and 2SB - UK Vintage Radio Repair and Restoration Discussion Forum

Andy Day · 10th May 2007, 7:53 pm

Does anyone know the pinouts of the following Japanese devices?

2SA353, 2SB175, 2SB400 and 2SB423. They are all Ge PNP in a tin can like the old AC128s etc used in Roberts radios circa late '60s. Possibly the same connections? The meter says they may be but of course the C and E could be swapped over!

Paul Stenning · 10th May 2007, 8:17 pm

Is there a dot or bar by one of the leads? If so that will mark the collector. Hopefully that'll confirm your meter checks.

Unfortunately my Towers book is buried in a box somewhere so I can't look it up, and the DATA one on my Valve Data CD doesn't give the pinouts.

radiohm · 10th May 2007, 8:36 pm

Hi Andy.

They are all the same pinout as AC128.

Regards.

Mike.

paulsherwin · 10th May 2007, 9:07 pm

The indicator spot isn't always there, either because it was never applied or has worn off, but you can work out the connections from the triangular arrangement as illustrated above.

Paul

Andy Day · 11th May 2007, 6:46 pm

Thanks for that Lads, it's confirmed what I suspected, just wanted to be sure!

10th May 2007, 7:53 pm	#1
Andy Day Pentode Join Date: Aug 2005 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 154	Japanese transistor pinouts, 2SA and 2SB Does anyone know the pinouts of the following Japanese devices? 2SA353, 2SB175, 2SB400 and 2SB423. They are all Ge PNP in a tin can like the old AC128s etc used in Roberts radios circa late '60s. Possibly the same connections? The meter says they may be but of course the C and E could be swapped over! __________________ The older I get, the faster I was!

10th May 2007, 8:17 pm	#2
Paul Stenning Administrator Join Date: Dec 2002 Location: Cardiff Posts: 9,073	Re: Japanese transistor pinouts, 2SA and 2SB Is there a dot or bar by one of the leads? If so that will mark the collector. Hopefully that'll confirm your meter checks. Unfortunately my Towers book is buried in a box somewhere so I can't look it up, and the DATA one on my Valve Data CD doesn't give the pinouts. __________________ Paul Stenning Forum Admin/Owner and BVWS Webmaster

10th May 2007, 8:36 pm	#3
radiohm Pentode Join Date: Jan 2006 Location: Stockton On Tees, Cleveland Posts: 18	Re: Japanese transistor pinouts, 2SA and 2SB Hi Andy. They are all the same pinout as AC128. Regards. Mike. Attached Thumbnails

10th May 2007, 9:07 pm	#4
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,970	Re: Japanese transistor pinouts, 2SA and 2SB The indicator spot isn't always there, either because it was never applied or has worn off, but you can work out the connections from the triangular arrangement as illustrated above. Paul

11th May 2007, 6:46 pm	#5
Andy Day Pentode Join Date: Aug 2005 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 154	Re: Japanese transistor pinouts, 2SA and 2SB Thanks for that Lads, it's confirmed what I suspected, just wanted to be sure! __________________ The older I get, the faster I was!