Vintage Synth Repair

oxygeno,

I believe that this is the correct behavior on the Axxe.
There's only one s&h circuit inside and it's switched between the  
keyboard CV input/gate  or noise input/ LFO trig.
So there's nothing sampling or holding the key CV when the switch is on.
The thing to do is turn the release slider down when using s&h, which  
sucks.

I've thought about adding the "music from outerspace"  s&h board to it .
I haven't played the Axxe in a bit so I'll check out your other  
questions when I get home.


peace,
john


On Oct 24, 2007, at 12:39 PM, oxygeno1313 wrote:

> Hey..
>
> i have the same problem... is this is correct ?
>
> I have an ARP AXXE MK1.
>
> regards,
>
>
> --- In vintagesynthrepair@yahoogroups.com, John Wieczorek
> <evening@...> wrote:
>>
>>
>> Any Axxe owners on the list?
>>
>> I just got around to repairing an Axxe that i've had on the shelf
> for
>> a bit.
>> The main issue was a broken trace in the cv memory circuit.
>> The keyboard now tracks correctly and the portamento works too.
>>
>> The s/h circuit seems odd though
>> According to the service manual, when you engage the the s/h
> switch
>> the noise source is connected to the memory circuit and key cv
> buss
>> is routed directly to the vco mod in. all of the has the effect
> that
>> while key presses do offset the vco pitch, that offset isn't held
> or
>> memorized upon key release.  So when the key is released the vco
> then
>> returns to it's base pitch which is determined by the tune knob
> and
>> the transpose switch.
>>
>> This seems so weird that I just wanted to ask if anyone else had
>> noticed this.
>>
>> Portamento in s/h mode doesn't behave as expected either, so maybe
>> something else is broken or shorted...
>>
>> jmw
>>
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