roland jazz chorus-55 amp repair

weesatron · 20th May 2009, 11:13 AM

H i have an old Roland jazz chorus-55 to repair and need help with a few things.

1. the reverb pot is missing and don't know what value to replace it with

2. i cant find new output transistors (2sd1408 and 2sb1017) any ideas where i can get them or an equivalent

jaycee · 20th May 2009, 12:30 PM

IF there are any other pots, check those.. they are probably similar values. I doubt the pot is critical - try a few values. 100K is probably a good start.

For the output transistors, well you could use MJE15034/5 or similar. They are faster so watch out for stability issues, but otherwise they should work well.

weesatron · 20th May 2009, 06:23 PM

would these work ?

http://www.datasheetcatalog.com/data...5/2SD526.shtml

http://www.datasheetcatalog.com/data.../2SB950A.shtml

weesatron · 21st May 2009, 09:01 AM

Or thesee
http://www.alldatasheet.com/datashee...EC/2SD526.html
http://www.datasheetcatalog.com/data...5/2SB596.shtml

I can get these in New zealand easily

20th May 2009, 11:13 AM	#1
weesatron diyAudio Member Join Date: Sep 2008	roland jazz chorus-55 amp repair H i have an old Roland jazz chorus-55 to repair and need help with a few things. 1. the reverb pot is missing and don't know what value to replace it with 2. i cant find new output transistors (2sd1408 and 2sb1017) any ideas where i can get them or an equivalent

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20th May 2009, 12:30 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	IF there are any other pots, check those.. they are probably similar values. I doubt the pot is critical - try a few values. 100K is probably a good start. For the output transistors, well you could use MJE15034/5 or similar. They are faster so watch out for stability issues, but otherwise they should work well.

20th May 2009, 06:23 PM	#3
weesatron diyAudio Member Join Date: Sep 2008	would these work ? http://www.datasheetcatalog.com/data...5/2SD526.shtml http://www.datasheetcatalog.com/data.../2SB950A.shtml

21st May 2009, 09:01 AM	#4
weesatron diyAudio Member Join Date: Sep 2008	Or thesee http://www.alldatasheet.com/datashee...EC/2SD526.html http://www.datasheetcatalog.com/data...5/2SB596.shtml I can get these in New zealand easily

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