[sdiy] [AH] Arp Solina with excessive chorus noise

[Michael E Caloroso]

I don't subscribe to the "re-cap" club.  Very rarely does it fix
anything in synths or string machines.

Electrolytics do fail, but usually when subjected to high heat.  Think
guitar amps and power amplifiers.  Not synths.  Lots of myths from the
guitar world propagate to the synth world.

Solina did not use a commander for the BBD circuits.  That is the
accepted technique to reduce noise in BBDs.

MC

On 1/31/16, Gordonjcp <gordonjcp at gjcp.net> wrote:
> On Sun, Jan 31, 2016 at 10:26:04PM +0000, Chris Juried wrote:
>> Agreed, Tom. Strap an ESR meter to those caps and watch the resistance
>> shoot up. Replace them and watch you AC ripple fall.  Sincerely,
>
> Unlikely.  Except in cheap crappy switched-mode power supplies,
> electrolytics just don't fail.  Maybe if you're working on equipment that
> was built in and has not been switched on since the 1950s or 1960s, you'd
> have a problem.
>
> In roughly 30 years of repairing electronic equipment I've replaced maybe
> half a dozen genuinely faulty electrolytics (save the aforementioned cheap
> crappy SMPSUs - if I never see an Amstrad satellite TV receiver again it'll
> still be too soon).  Disc ceramic and tantalum bead capacitors are a
> different story altogther.
>
> Incidentally, I automatically charge an extra 300 quid to even carry
> something that's been "re-capped" in from the car, never mind take the
> screws out.  Every single piece of equipment I've seen that has been
> "re-capped" has had significant faults, made worse by the "HERP DERP IT NO
> WORKY MUST BE CAPACITATORS" mentality that leads people to fuck about with
> the insides blindly.  Generally it takes a full day of work to get anything
> "re-capped" to even run at all, never mind correctly.
>
> Never, *ever* "re-cap" things.  If it has a fault, fix it.  It won't be an
> electrolytic capacitor.
>
> --
> Gordonjcp MM0YEQ
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