C4689/a1804

croat47 · 23rd December 2006, 09:15 PM

I have an amplifier for scrap/salvage. The output devices are C4689/A1804. Any suggestions for a re-use?

The only other thread I found listing them ws as possible devices for a Leach.

Thanks for any help.

croat47 · 27th December 2006, 12:46 PM

Bump.

AndrewT · 27th December 2006, 01:43 PM

Hi,
did you find the Toshiba datasheet?
120V, 8A, 70W, 30MHz,
good SOAR upto 65Vce
good gain if O grade rather than R grade.

Tosh suggest good for 55W into 8ohm. Asking a lot and needs restrictive protection.
I suggest 2pair could do about 65W into 8r from +-40Vdc.
3pair about 95W into 8r from +-47Vdc.

May also do as a high duty driver for a multiple pair output stage driving into low impedance (2ohm).

The Leach clone uses 3pair. This would be just 210W of device which would be similar to 1pair of MJL4302 (230W)

croat47 · 27th December 2006, 03:40 PM

Andrew...thanks!

I could not find the data sheet. Do you have it in PDF or otherwise...a link?

I have two pair from an old stereo. Maybe I will just reverse engineer and break the thing down to a cleaner-looking and slightly upgraded amplifier of the same type? That is unless there are suggestions of schematics about?

Also, any objections to bass guitar amplifier use?

Thanks!

AndrewT · 27th December 2006, 06:01 PM

Hi Cro,
you need to learn to Google.
Search for 2sa1804 and up comes a whole series of possibles,
here's the one I used.
http://www.datasheetcatalog.com/data.../2SA1804.shtml

Only two pair hardly seems worth the effort of designing an amplifier around them.

croat47 · 27th December 2006, 09:06 PM

Sorry. Used google...got very few results. Guess I,ll strip it for parts.

Thanks again.

23rd December 2006, 09:15 PM	#1
croat47 diyAudio Member Join Date: May 2005 Location: Eastern Shore, Maryland	C4689/a1804 I have an amplifier for scrap/salvage. The output devices are C4689/A1804. Any suggestions for a re-use? The only other thread I found listing them ws as possible devices for a Leach. Thanks for any help. __________________ Regards, Aaron

27th December 2006, 12:46 PM	#2
croat47 diyAudio Member Join Date: May 2005 Location: Eastern Shore, Maryland	Bump. __________________ Regards, Aaron

27th December 2006, 01:43 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, did you find the Toshiba datasheet? 120V, 8A, 70W, 30MHz, good SOAR upto 65Vce good gain if O grade rather than R grade. Tosh suggest good for 55W into 8ohm. Asking a lot and needs restrictive protection. I suggest 2pair could do about 65W into 8r from +-40Vdc. 3pair about 95W into 8r from +-47Vdc. May also do as a high duty driver for a multiple pair output stage driving into low impedance (2ohm). The Leach clone uses 3pair. This would be just 210W of device which would be similar to 1pair of MJL4302 (230W) __________________ regards Andrew T.

27th December 2006, 03:40 PM	#4
croat47 diyAudio Member Join Date: May 2005 Location: Eastern Shore, Maryland	Andrew...thanks! I could not find the data sheet. Do you have it in PDF or otherwise...a link? I have two pair from an old stereo. Maybe I will just reverse engineer and break the thing down to a cleaner-looking and slightly upgraded amplifier of the same type? That is unless there are suggestions of schematics about? Also, any objections to bass guitar amplifier use? Thanks! __________________ Regards, Aaron

27th December 2006, 06:01 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Cro, you need to learn to Google. Search for 2sa1804 and up comes a whole series of possibles, here's the one I used. http://www.datasheetcatalog.com/data.../2SA1804.shtml Only two pair hardly seems worth the effort of designing an amplifier around them. __________________ regards Andrew T.


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27th December 2006, 09:06 PM	#6
croat47 diyAudio Member Join Date: May 2005 Location: Eastern Shore, Maryland	Sorry. Used google...got very few results. Guess I,ll strip it for parts. Thanks again. __________________ Regards, Aaron

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