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Old 20th May 2009, 11:13 AM   #1
diyAudio Member
Join Date: Sep 2008
Default 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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Old 20th May 2009, 12:30 PM   #2
jaycee is offline jaycee  United Kingdom
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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.
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Old 20th May 2009, 06:23 PM   #3
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would these work ?
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Old 21st May 2009, 09:01 AM   #4
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Or thesee

I can get these in New zealand easily
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