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Old 19th February 2008, 11:23 AM   #1
Thomo is offline Thomo  United Kingdom
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Default Meridian 103 - bdy56 Transistor Alternatives?

Hi. I have an old Meridian 103 which has four BDY56 as output transistors. Unfortunately two of these are bad and the only replacements I can find are 12 each.

Could I use any of these instead?

mj21194

2n3773

bdy56

Any help greatly appreciated, thanks.

Lee
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Old 19th February 2008, 12:44 PM   #2
poynton is offline poynton  United Kingdom
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Can't you use the plastic TO220 versions ?
A lot cheaper.
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Old 19th February 2008, 12:56 PM   #3
Thomo is offline Thomo  United Kingdom
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Hi Andy. I don't think that it would be possible to mount them on the heatsink. They're mounted in a similar way to a Quad 405.

I have stuck the 2n3773's in just to see if they work but I have a problem with one channel. I don't have a scope so I can't check for oscillations etc though. Any ideas as to whether they're suitable? They seem to have very similar specs looking at the datasheets, but then I am a bit of a noob.

Lee.
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Old 20th February 2008, 10:31 AM   #4
burbeck is offline burbeck  United Kingdom
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hi Lee,
have a look at
BUV20
MJ15003
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Old 20th February 2008, 10:35 AM   #5
Thomo is offline Thomo  United Kingdom
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Hi Bob. Thanks for that. Do you think that the mj15003 will have as good a sound as the originals? I have them in my Quad 405 but I am told they're not as good as the 2n3773's.

Lee.
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Old 20th February 2008, 10:44 AM   #6
burbeck is offline burbeck  United Kingdom
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hi Lee,
the MJ15003 are nice and cheap try them out.
the BUV20 are better but expensive.

why not give meridian service a call and ask there advice on the sub of these?
i repaired one of these amps a while ago which had one set of output devices already replaced (by meridian) for the life of me i cant remember the type number they used, it may have been BDY95 not sure. i was only replacing the speaker sockets.

let me know if you do call them
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Old 20th February 2008, 11:57 AM   #7
Thomo is offline Thomo  United Kingdom
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I rang them yesterday, and they told me that they would be ringing back today, as they guy I need to speak to wasn't there. Aparently he worked there when the 103's were in production!

Meridian customer service has been outstanding I must say. How many companies would go out of their way to provide service information and help about a product they marketed nearly thirty years ago?

Lee.
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Old 20th February 2008, 04:06 PM   #8
burbeck is offline burbeck  United Kingdom
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hi Lee,
i agree meridian are one of the few companies left with great back up.
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Old 25th February 2008, 10:53 AM   #9
burbeck is offline burbeck  United Kingdom
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hi Lee
did you get an answer from them?
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Old 25th February 2008, 11:56 AM   #10
Thomo is offline Thomo  United Kingdom
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Not yet, I will have to try again I think. Whilst waiting for a reply I ordered four MJ21194G transistors. I got them for $15 shipping which works out at around 7.50. Not bad I thought.

In the mean time, I fitted 2n3773's but I still have no joy at getting the thing to work. How accurately can you tell a transistor is faulty by testing? I have a fairly standard multimeter and used the diode test function.

I removed all the transistors and tested them, they all seemed ok, so I put them back with the new output trannies and still read -1.2v & -2.3v offset. I'm thinking of sending it to Meridian but don't want to, as I wouldn't learn anything out of it.

Lee.
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