Hi all,
I recently picked up a Yamaha M-80 amp that is in beautiful cosmetic shape but needs some work. I disassembled it tonight and found one blown output transistor, which is a Sanken 2SA1169 (code 63P). All the other outputs are fine. What do people recommend in terms of replacing it? Should I try to find one on eBay? That is never my preference, but there do seem to be some U.S. sellers that claim to have NOS replacements for about $15. Not cheap, but I'd do it if that is the best option.
I'm definitely going to have other questions as I go through this process, so I thought having a clean thread would he helpful. Thanks for your help in advance.
I recently picked up a Yamaha M-80 amp that is in beautiful cosmetic shape but needs some work. I disassembled it tonight and found one blown output transistor, which is a Sanken 2SA1169 (code 63P). All the other outputs are fine. What do people recommend in terms of replacing it? Should I try to find one on eBay? That is never my preference, but there do seem to be some U.S. sellers that claim to have NOS replacements for about $15. Not cheap, but I'd do it if that is the best option.
I'm definitely going to have other questions as I go through this process, so I thought having a clean thread would he helpful. Thanks for your help in advance.
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It also looks like another transistor is bad, Toshiba 2SC3298B. It might be one of the driver transistors, but the other three test fine. I'd love advice on whether to replace just that one or all four with a new set.
M80
Beware these are problematic amplifiers. Have one in for repair.
Replaced outputs with 2SC5200/2SA1943 or any similat TO3P devices.
We use these Toshibas in our production high end home amps.
The 2SC3298 drivers I replaced with MJE15030 and the PNP 2SA1352 with a MJE15031.
Note there are service bulletins out for this amplifier.
The glue on the main PCB goes conductiove and you MUST remove all parts (mainly caps) with glue, remove it completely and I advise to insert new electrolytics.
R221 (22 ohm) always goes open circuit. Replace with a 2 or 3 watt part.
Download schems from the web.
Steve Mantz Zed Audio Corp.
Beware these are problematic amplifiers. Have one in for repair.
Replaced outputs with 2SC5200/2SA1943 or any similat TO3P devices.
We use these Toshibas in our production high end home amps.
The 2SC3298 drivers I replaced with MJE15030 and the PNP 2SA1352 with a MJE15031.
Note there are service bulletins out for this amplifier.
The glue on the main PCB goes conductiove and you MUST remove all parts (mainly caps) with glue, remove it completely and I advise to insert new electrolytics.
R221 (22 ohm) always goes open circuit. Replace with a 2 or 3 watt part.
Download schems from the web.
Steve Mantz Zed Audio Corp.
Moer,
For the drivers, I have some MJE15032G and MJE15033G laying around. Would those be appropriate subs? Or do I need the 30 and 31?
Thanks
For the drivers, I have some MJE15032G and MJE15033G laying around. Would those be appropriate subs? Or do I need the 30 and 31?
Thanks
