Yes an open trace. That was it. Would explain the sparks and smoke in that
area when it happened (I had the lid open and actually saw it). I did replace
one of the transistors Q7 I believe but that was one of the first things I did
after the incident. I used 2SK170-GRs by the way. That's what I put in Q3,
Q4, Q5 and Q7 as a replacement for the 2SK364s that you can't find anymore.
Anyway, yes Q7 was already replaced and I'm guessing Q6 is okay because
I didn't change it.
Also I think my MP1 came with the rear jack mod from the factory. It definitely
hadn't been opened until I did it. The tubes were original (and dead) when I
purchased it on eBay and the battery was dead as well.
I'll send you all the files I have tonight. Thanks again.
B
On Nov 28, 2012, at 5:07 PM, Kaz Kylheku wrote:
>
> On Wed, 28 Nov 2012 15:10:57 -0600, Benjamin Catchings
> <jonahcrock@???> wrote:
>> I found it. It sounds amazing now. By the way in my last email I
>> meant the output
>> level pot, it had been a very long day.
>
> Nice work, great to hear that.
>
> You mean open trace, not shorted, right?
>
> The toasted resistor took out the copper running underneath it? Wow.
>
> Yet, you didn't have to replace the transistors there ...
>
>> my test signal source. I pulled the wiring for the rear jack, which
>> by the way just runs
>> straight to the front jack on mine and doesn't attach to the rear
>> board at all, and
>
> So you have the rear-jack mod. I heard these mods were done by ADA
> themselves. Probably due to player demand to have a high-Z input in
> the back, same as the front.
>
> I suspected that. If you didn't have the mod, the symptoms couldn't
> be exactly the same through either jack, given what the root cause
> was.
>
>> a good bit different from what I'm working with. I need to send you
>> my little collection
>> of MP-1 files since you have this archive up and going.
>
> Please. By the way, I just hunted down some Microcab schematics
> and put them up. I had to get two pieces of a multi-part Zip
> archive from two different websites!
>
>
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> http://www.kylheku.com/mp1
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