Vintage Synth Repair

Hi everyone,
I´m a new member here, discovering all there is to vintage synth 
repair. I have been building and repairing for a while now, but mostly 
for my own needs.
After the first Norwegian synth gathering, the pressure was on to start 
repairing other people´s gear as well. So right now I have an OB-8, an 
ARP Axxe, Korg PolySix and a Korg Delta on my bench, as well as two 
Yamaha DMC 1000 digital mixers, and some of my own instruments and 
modules that need some repair as well. Also a Roland VP-330 mk I that 
needs calibration (too much carrier bleedthrough on the vocoder). I 
have already repaired and calibrated moogs, ARP, Roland, Korg et al, 
but there is a lot to learn in this business. I have bought parts from 
the usual suspects in the US and Europe, and I have some supply of nice 
parts, originally intended for my own projects (that are, of course, 
way too many). Oh, and when I find the time, I record some music and 
gig either solo or with my band WintherStormer. I am based in Norway. 
Lot´s of good ol´ analogs around here, but way too few in good shape, 
or qualified technicians to take care of these old goodies. Looking 
forward to the conversations here.

Terje Winther
terjewi@...
http://www.wintherstormer.no/

Welcome!

I'd be interested how you go with the VP330 carrier bleed through, My 
friend has a VP-330, and almost over night, it's intelligibility 
dropped to "crap"
I never thought about it too much, but it might be a case of 
adjustment.. 
Let us know if you find the tuning procedure etc for carrier 
bleedthrough.. 

Regards

Mike
>
> Hi everyone,
> I´m a new member here, discovering all there is to vintage synth 
> repair. I have been building and repairing for a while now, but 
mostly 
> for my own needs.
> After the first Norwegian synth gathering, the pressure was on to 
start 
> repairing other people´s gear as well. So right now I have an OB-8, 
an 
> ARP Axxe, Korg PolySix and a Korg Delta on my bench, as well as two 
> Yamaha DMC 1000 digital mixers, and some of my own instruments and 
> modules that need some repair as well. Also a Roland VP-330 mk I 
that 
> needs calibration (too much carrier bleedthrough on the vocoder). I 
> have already repaired and calibrated moogs, ARP, Roland, Korg et 
al, 
> but there is a lot to learn in this business. I have bought parts 
from 
> the usual suspects in the US and Europe, and I have some supply of 
nice 
> parts, originally intended for my own projects (that are, of 
course, 
> way too many). Oh, and when I find the time, I record some music 
and 
> gig either solo or with my band WintherStormer. I am based in 
Norway. 
> Lot´s of good ol´ analogs around here, but way too few in good 
shape, 

> or qualified technicians to take care of these old goodies. Looking 
> forward to the conversations here.
> 
> Terje Winther
> terjewi@...
> http://www.wintherstormer.no/
>

> Welcome!

Thanks!

> I'd be interested how you go with the VP330 carrier bleed through,

It is just out of calibration. There are a lot of input and output 
filters/envelope followers that need to be calibrated. Lots of 
trimmers!

>  My
> friend has a VP-330, and almost over night, it's intelligibility
> dropped to "crap"

Yes. Same with this. Strings went out. Turned out to be a 0.40$ op-amp 
that needed replacement. Took a while to find it, though.

> Let us know if you find the tuning procedure etc for carrier 
> bleedthrough..

I have the service manual, which explains it quite well. It will be a 
lot of work. I will let you know the results.


Terje Winther
terjewi@...
http://www.wintherstormer.no/