[sdiy] Advice?: Powering up a vintage keyboard after several years

[Alexandre Souza]

Use an incandescent lamp 100-150w in series (!) with the load.

2016-10-11 11:58 GMT-03:00 Barry Klein <barryklein at cox.net>:

> What do you think the odds are that I'm going to have an issue?
> Say on a Memorymoog.  The damn thing has so many CMOS parts that croak for
> whatever reason.  Was it because the owner powered it up infrequently?
> Was it because of weak output caps in the supplies?  I tend to think the
> parts just crap out over time because of manufacturing process flaws. I
> tested the output caps with my LC102 on the memorymoogs (3) that I repaired
> and they were fine - the parts just went bad.  Otherwise, bad caps, use the
> synth multiple times you will just as likely see failures with a lot of use
> rather than after 5 years I would assume...
> Like on the Andromeda's I had been looking at recently - the CPU just
> seems to die and needs to be replaced.
> Have you really seen power supply faults in a pretest like you suggest?
> Without a load I wonder if the issues even show up.
> I guess I'll let you guys know the score after I try them all....
>
> Barry
>
>
> -----Original Message----- From: Michael E Caloroso
> Sent: Tuesday, October 11, 2016 7:17 PM
> To: Barry Klein
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Advice?: Powering up a vintage keyboard after several
> years
>
> If it's any synth with CMOS or CEM or SSM ICs in it, verify the power
> supply FIRST.  If a rail is missing or over spec it can blow these
> things.  The last thing you want are blown CEM/SSM ICs.
>
> MC
>
> On 10/11/16, Barry Klein <barryklein at cox.net> wrote:
>
>> Well, that’s me....
>> If the consensus is just plug it in I’m good but if it is check the
>> supplies
>> first....  memorymoogs, prophet 5, lesser synths...  I’d just leave them
>> off
>> – don’t need the added grief right now.
>> No way am I going to tweak up the memorymoog supplies and go through
>> calibration of them again... at least not now.
>> Maybe the Variac is just a thing for tube-based things like old ham sets
>> or
>> guitar amps?
>> I have 2 (transistor(ized) ham tranceivers and a Drake receiver that I
>> need
>> to try too.
>>
>>
>> Barry
>>
>>
>> From: Jason Proctor
>> Sent: Tuesday, October 11, 2016 6:35 PM
>> To: David G Dixon
>> Cc: Barry Klein ; synth-diy DIY
>> Subject: Re: [sdiy] Advice?: Powering up a vintage keyboard after several
>> years
>>
>> have someone who knows what they're doing check at least the PSU first?
>>
>>
>>
>> On Tue, Oct 11, 2016 at 6:25 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
>>
>>   Plug that shit in!
>>
>>
>>
>> ------------------------------------------------------------
>> ----------------
>>     From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On
>> Behalf
>> Of Barry Klein
>>     Sent: Tuesday, October 11, 2016 5:14 AM
>>     To: synth-diy DIY
>>     Subject: [sdiy] Advice?: Powering up a vintage keyboard after several
>> years
>>
>>
>>     I am going through the stuff in my garage.  I have several vintage
>> synths – some worth quite a bit now – and they haven’t been powered in at
>> least 5 years.
>>     What would you recommend – advancing on a Variac, or just plug it in?
>>     Barry
>>
>>
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>>
>>
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