[sdiy] aging transformer replacement

[Theo]

With older transformers of the open construction kind the coils can get
"loose" overtime.
A blob of PU construction glue (this stuff expands to fill gaps, a glue
cousin of PU foam) or
sometimes just some tactically inserted folded paper, usually fixes the
problem.

Cheers
Theo


----- Original Message -----
From: jhno <ear at subminimal.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, June 10, 2004 10:47 PM
Subject: [sdiy] aging transformer replacement


> hello sdiy! it has been a while.
>
> i come bowing and scraping to know:
>
> is it straightforward to replace power transformers in aging synths?
>
> several of my devices start to hum/buzz acoustically after being powered
up
> for a while - typically 0.5 - 2 hours, say. it is the transformers, of
> course. i imagine they are just getting old.
>
> the main offenders are:
> eventide h3000
> orig. nord lead
> roland jx10
> prophet 5 r3
>
> some of the power supplies are more elaborate than others. if i measure
> each winding utilized and find a transformer (or multiple units) that give
> the same voltages with plenty of volt-amps to spare, is it safe to attempt
> the replacement?
>
> or, is there some other way to cure the hum? it can be quite distracting.
>
>
> as an aside, i have bought a few 110 to 110 transformers for isolation and
> power conditioning purposes. these have buzzed louder than anything. very
> industrial.
>
> jhno
>
>
>