Martin:
For PH1, PH2, and PH3 on the PRA board, the Xvive Vactrol VTL5C3 is a drop-in replacement.
Its response curve?is the same as original working parts on the PRA card according to my tests and I have used?them on several occasions to restore function to CS-80's without issues. I keep them in the parts bins for the occasion when a customer's machine shows up with a dead?one.
Scott Rodriguez
Hi Martin, how told that was Mr. Scott Rodriguez, I only agreed
with his comment.
Anyway let me tell you that if the Diode that illuminates the photo
resistor in PH1, PH2 or PH3 opens up, that is going to make that you
do not get sound from the CS. This is because of the topology of the
circuit (devices are in a serie).
Regarding a replacement, since I didn't have problems with them, I
do not know. But I can give you some ideas.
On one hand you can try to look for an integrated device (how I
suppose that PH1, PH2 and PH3 are). The main characteristic must be
the resistance of the photo resistor with the lower and higher
light..... I have seen in t he past.... long, long time ago, that
sometime these devices are custom made. On one hand you have the
photocell and lamp and a tube keeping the lamp facing the photocell,
usually kept
all together
by mean of termocontraible tube. Photocells of a given size have
likely response (this is not absolutely true, but we can approach
the point this way). Replacing the old lamp with a LED is something
that deserve a analysis and trial-error procedure.... They do not
have for sure a likely response regarding Voltage applied versus
lighting power. Anyway there is something to keep in mind, to avoid
problems of a misbehavior, replace all the PHx at once. Depending of
the lighting device chosen, you surely will have to make an
adjustment to the variable voltage that feeds the lamps.
Hope these thoughts can help.
Have a nice day/night!
Gustavo.
On 9/4/2022 7:05 PM, Mooseheads wrote:
Greetings
to all,
?
Since
the topic is including problems on the PRA board (which mine
has) I thought I
would ask.? Gustavo when you write:
?
¡°If
one or both of the sensors in the CS-80 are dead,
replacements are available.
I'm not familiar with the¡¡±
?
Are
you by any change referring to PH1, PH2 and PH3 on the PRA
board?? I have been looking for a replacement part
for some time.? Would you mind letting me
know what that replacement part is?? This
is the last issue I am aware off in my machine, I would very
much like to rectify
the problem!
?
?
Thank
you very much
?
?
Martin
