Wurlitzer 3010 repair help

I am attempting to restor a 3010 and am having a problem with the selector
circuit. The 50 record unit uses a combination of a 1/2 wave rectifier and
two solenoids to make the selections. Teh rectifier is the old fashioned
selenium type that is square and has cooling fins on it. It was made by
Sarkes Tarzan who is long out of business. The rectifier is shot and I need
to put in a substitute circuit. Doe anyone on this group have a fix for this
issue? Thanks in advance for any solution you may be able to offer. Jim

I don't remember the details, but if you search or ask at
rec.antiques.radio+phono this subject has been discussed before.
Here is just one of numerous instances.

"FrankG" wrote in message
...
Hey all,
I have a rather dumb question to ask. I have been reading that it is
best to replace
the selenium rectifier with a silicon version such as a 1N4007 and adding
a
50 ohm
1 or 2 watt resistor in series with it. Is this right? And which way
should
the banded
end of the diode be facing? towards filter caps or away from them? Any
help
would be appreciated as I am not an electronics genius.


Yes, this is correct.. and use a 2 watt resistor, for the safety factor. The
band (cathode) end of the silicon diode goes toward the filter caps.





"TheMurf" wrote in message
...
I am attempting to restor a 3010 and am having a problem with the selector
circuit. The 50 record unit uses a combination of a 1/2 wave rectifier and
two solenoids to make the selections. Teh rectifier is the old fashioned
selenium type that is square and has cooling fins on it. It was made by
Sarkes Tarzan who is long out of business. The rectifier is shot and I need
to put in a substitute circuit. Doe anyone on this group have a fix for
this issue? Thanks in advance for any solution you may be able to offer.
Jim

Thanks for the help. I made a post over in the radio newsgroup. I had
forgotten about them. A bunch of geniuses over there. theMurf

"Arthur Dent" wrote in message
...
I don't remember the details, but if you search or ask at
rec.antiques.radio+phono this subject has been discussed before.
Here is just one of numerous instances.

"FrankG" wrote in message
...
Hey all,
I have a rather dumb question to ask. I have been reading that it is
best to replace
the selenium rectifier with a silicon version such as a 1N4007 and adding
a
50 ohm
1 or 2 watt resistor in series with it. Is this right? And which way
should
the banded
end of the diode be facing? towards filter caps or away from them? Any
help
would be appreciated as I am not an electronics genius.


Yes, this is correct.. and use a 2 watt resistor, for the safety factor.
The
band (cathode) end of the silicon diode goes toward the filter caps.





"TheMurf" wrote in message
...
I am attempting to restor a 3010 and am having a problem with the selector
circuit. The 50 record unit uses a combination of a 1/2 wave rectifier and
two solenoids to make the selections. Teh rectifier is the old fashioned
selenium type that is square and has cooling fins on it. It was made by
Sarkes Tarzan who is long out of business. The rectifier is shot and I
need to put in a substitute circuit. Doe anyone on this group have a fix
for this issue? Thanks in advance for any solution you may be able to
offer. Jim

On 2007-05-19 20:47:23 -0700, "TheMurf" said:

I am attempting to restor a 3010 and am having a problem with the selector
circuit. The 50 record unit uses a combination of a 1/2 wave rectifier and
two solenoids to make the selections. Teh rectifier is the old fashioned
selenium type that is square and has cooling fins on it. It was made by
Sarkes Tarzan who is long out of business. The rectifier is shot and I need
to put in a substitute circuit. Doe anyone on this group have a fix for this
issue? Thanks in advance for any solution you may be able to offer. Jim

If you replace a selenium rectifier with a silicon rectifier you MUST
make certain to fuse the AC side of the bridge. Selenium bridge
rectifiers will fail OPEN while Silicon will SHORT - blowing the
transformer in the process.

For the Wurlitzers you do not require a load resistor, simply take a
25A/200PIV bridge rectfier and install it in place of the open selenium
bridge, taking care to wire the AC and DC lines correctly!

FUSE the AC SIDE!!! Same value as the DC is just fine.

John :-#)#
--
(Please post followups or tech enquires to the newsgroup) John's
Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com "Old pinballers never die, they
just flip out."

John, Thanks for the great information. This all makes sense to me. I have
replaced the rectifier before successfully but by trial and error. I'm glad
to have the correct information. I'll give it a try.

"John Robertson" wrote in message
news:2007052222062050073-spam@flipperscom...
On 2007-05-19 20:47:23 -0700, "TheMurf" said:

I am attempting to restor a 3010 and am having a problem with the
selector
circuit. The 50 record unit uses a combination of a 1/2 wave rectifier
and
two solenoids to make the selections. Teh rectifier is the old fashioned
selenium type that is square and has cooling fins on it. It was made by
Sarkes Tarzan who is long out of business. The rectifier is shot and I
need
to put in a substitute circuit. Doe anyone on this group have a fix for
this
issue? Thanks in advance for any solution you may be able to offer. Jim

If you replace a selenium rectifier with a silicon rectifier you MUST make
certain to fuse the AC side of the bridge. Selenium bridge rectifiers will
fail OPEN while Silicon will SHORT - blowing the transformer in the
process.

For the Wurlitzers you do not require a load resistor, simply take a
25A/200PIV bridge rectfier and install it in place of the open selenium
bridge, taking care to wire the AC and DC lines correctly!

FUSE the AC SIDE!!! Same value as the DC is just fine.

John :-#)#
--
(Please post followups or tech enquires to the newsgroup) John's Jukes
Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757
or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com
"Old pinballers never die, they just flip out."