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PostPosted: Sat Feb 04, 2017 2:24 pm 
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Bottle Rocket

Joined: Fri Jul 27, 2012 11:20 pm
Posts: 13
Narrowed it down to ldr's (optocouplers) does any one know where to get these ldr's?

Thanks


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PostPosted: Wed Feb 08, 2017 1:19 am 
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Mark II
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Joined: Fri Nov 16, 2012 4:55 pm
Posts: 59
Location: East Coast, New Jersey
This place might be able to special order them. I couldn't find the specific part

http://www.amprepairparts.com/mesaparts.htm

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PostPosted: Wed Feb 08, 2017 7:05 pm 
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Donating Member

Joined: Thu Jul 09, 2009 1:41 am
Posts: 374
Location: Canberra, Australia
Be aware Mk III uses a mix of VTL5C1/VTL5C4's
The ones near V1 can be a PITA to replace

Out of curiosity, how did U diagnose the failing opto ?

I'd suspect the relay before an opto..

How much "popping" are we talking - as bad as the IIB ??

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PostPosted: Thu Feb 09, 2017 5:29 am 
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Bottle Rocket

Joined: Fri Jul 27, 2012 11:20 pm
Posts: 13
McBarry wrote:
Be aware Mk III uses a mix of VTL5C1/VTL5C4's
The ones near V1 can be a PITA to replace

Out of curiosity, how did U diagnose the failing opto ?

I'd suspect the relay before an opto..

How much "popping" are we talking - as bad as the IIB ??



I don't think the mk3 has relays, I believe it uses ldr's for Chanel switching for low noise.


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PostPosted: Tue Feb 14, 2017 2:08 pm 
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Donating Member

Joined: Thu Jul 09, 2009 1:41 am
Posts: 374
Location: Canberra, Australia
there's a relay but I'm not home to see the schematic.
greying memory says the R2 channel, but a perusal of schem will nail it in a heartbeat.

_________________
Mk I,export,GEQ,cream
Mk IIA,export,rev,cream
Mk IIB,export,rev, tweed tolex !!
Mk IIB,export, rev,GEQ,simul, black
Mk III head,rev,GEQ,cream
Kitty Hawk M1 head
Fender 75, export, 1973,15".
Fender 6G6A Bandmaster 1962
Fender AA763 Bandmaster 1964


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