Someone gave me one of these that he says smoked. I found a small
burned diode, (looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected to
the positive terminal of C1.This part looks like it must have been a
production change as all other parts are labled on the board but this
one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic that
they could share. Thanks for any help. Lenny

On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:

Someone gave me one of these that he says smoked. I found a small burned
diode, (looks like a 1N4000 series size) on the regulator board.This
diode was soldered accross C1 with the cathode connected to the positive
terminal of C1.This part looks like it must have been a production
change as all other parts are labled on the board but this one the board
is not labled for it and so it looks like it was a factory modification.
Tripp Lite won't help me at all with this problem. So I was hoping that
someone might have run into this before who might have any information
on this and/or perhaps a schematic that they could share. Thanks for any
help. Lenny

What happens when you replace the diode?



--
Live Fast, Die Young and Leave a Pretty Corpse

On Dec 1, 3:11*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:
Someone gave me one of these that he says smoked. I found a small burned
diode, *(looks like a 1N4000 series size) on the regulator board.This
diode was soldered accross C1 with the cathode connected to the positive
terminal of C1.This part looks like it must have been a production
change as all other parts are labled on the board but this one the board
is not labled for it and so it looks like it was a factory modification..
Tripp Lite won't help me at all with this problem. So I was hoping that
someone might have run into this before who might have any information
on this and/or perhaps a schematic that they could share. Thanks for any
help. Lenny

What happens when you replace the diode?

--
Live Fast, Die Young and Leave a Pretty Corpse

WelI I haven't replaced it as of yet because I don't know if it was
just a diode or a zener. And not knowing this and what else might be
wrong I wouldn't want to compound the problem. Lenny

On Wed, 01 Dec 2010 12:35:56 -0800, klem kedidelhopper wrote:

On Dec 1, 3:11Â*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:
Someone gave me one of these that he says smoked. I found a small
burned diode, Â*(looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected
to the positive terminal of C1.This part looks like it must have been
a production change as all other parts are labled on the board but
this one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic
that they could share. Thanks for any help. Lenny

What happens when you replace the diode?

--
Live Fast, Die Young and Leave a Pretty Corpse

WelI I haven't replaced it as of yet because I don't know if it was just
a diode or a zener. And not knowing this and what else might be wrong I
wouldn't want to compound the problem. Lenny

If it's a zener it would be clamping voltage on a reg circuit. Not
knowing what C1 is or does it's hard to say what its function is but
I would take an educated guess and say it's not a zener. I suppose you'll
need to figure out how C1 plays into the circuit. Personally I would ramp
the source up using a variac and watch what kind of voltage developed
where the cathode should be and take into consideration C1's rated
voltage and maybe develop a schematic in my head.




--
Live Fast, Die Young and Leave a Pretty Corpse

On Dec 1, 3:53*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 12:35:56 -0800, klem kedidelhopper wrote:
On Dec 1, 3:11*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:
Someone gave me one of these that he says smoked. I found a small
burned diode, *(looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected
to the positive terminal of C1.This part looks like it must have been
a production change as all other parts are labled on the board but
this one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic
that they could share. Thanks for any help. Lenny

What happens when you replace the diode?

--
Live Fast, Die Young and Leave a Pretty Corpse

WelI I haven't replaced it as of yet because I don't know if it was just
a diode or a zener. And not knowing this and what else might be wrong I
wouldn't want to compound the problem. Lenny

If it's a zener it would be clamping voltage on a reg circuit. Not
knowing what C1 is or does it's hard to say what its function is but
I would take an educated guess and say it's not a zener. I suppose you'll
need to figure out how C1 plays into the circuit. Personally I would ramp
the source up using a variac and watch what kind of voltage developed
where the cathode should be and take into consideration C1's rated
voltage and maybe develop a *schematic in my head.

--
Live Fast, Die Young and Leave a Pretty Corpse- Hide quoted text -

- Show quoted text -

Yeah I don't think that its a zener either. Its just that with the
cathode on + it doesn't seem like it could be forward biased so what
is it doing there? I haven't tried to draw it out but this otherwise
appears to be a straight forward 723 based linear regulator circuit.
The way this thing is built though its virtually impossible to reverse
engineer it. I do like your idea of using the variac for testing. I
have a small variac but with a small load on the PR60 ouput I don't
think it should be much of a problem. It ****es me off how
uncooperative most of these manufacturers have gotten in the past few
years. Back in the 60's when I started in electronics you could get
anything from most anyone. Today you would think I was asking for
state secrets.This is an obsolete model. What the hell difference
would it make to give me a schematic? Not like I'm going to try to
mass produce these things. I would just like to get it going for
myself. Lenny

On Wed, 01 Dec 2010 13:28:11 -0800, klem kedidelhopper wrote:

On Dec 1, 3:53Â*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 12:35:56 -0800, klem kedidelhopper wrote:
On Dec 1, 3:11Â*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:
Someone gave me one of these that he says smoked. I found a small
burned diode, Â*(looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode
connected to the positive terminal of C1.This part looks like it
must have been a production change as all other parts are labled
on the board but this one the board is not labled for it and so it
looks like it was a factory modification. Tripp Lite won't help me
at all with this problem. So I was hoping that someone might have
run into this before who might have any information on this and/or
perhaps a schematic that they could share. Thanks for any help.
Lenny

What happens when you replace the diode?

--
Live Fast, Die Young and Leave a Pretty Corpse

WelI I haven't replaced it as of yet because I don't know if it was
just a diode or a zener. And not knowing this and what else might be
wrong I wouldn't want to compound the problem. Lenny

If it's a zener it would be clamping voltage on a reg circuit. Not
knowing what C1 is or does it's hard to say what its function is but I
would take an educated guess and say it's not a zener. I suppose you'll
need to figure out how C1 plays into the circuit. Personally I would
ramp the source up using a variac and watch what kind of voltage
developed where the cathode should be and take into consideration C1's
rated voltage and maybe develop a Â*schematic in my head.

--
Live Fast, Die Young and Leave a Pretty Corpse- Hide quoted text -

- Show quoted text -

Yeah I don't think that its a zener either. Its just that with the
cathode on + it doesn't seem like it could be forward biased so what is
it doing there? I haven't tried to draw it out but this otherwise
appears to be a straight forward 723 based linear regulator circuit. The
way this thing is built though its virtually impossible to reverse
engineer it. I do like your idea of using the variac for testing. I have
a small variac but with a small load on the PR60 ouput I don't think it
should be much of a problem. It ****es me off how uncooperative most of
these manufacturers have gotten in the past few years. Back in the 60's
when I started in electronics you could get anything from most anyone.
Today you would think I was asking for state secrets.This is an obsolete
model. What the hell difference would it make to give me a schematic?
Not like I'm going to try to mass produce these things. I would just
like to get it going for myself. Lenny

Years ago I bought a used Nady 201 that I wanted to switch channels.
Requiredan xtal change and some tweaking of the RF circuits for both the
xmitter and rxcvr. I finally got someone to talk to me at Nady. Even sent
me some schematics. I called back maybe 2 weeks later and that person was
no longer employed there. Seems at least back then it would take a
Wikileak to get any info from Nady. This guy probably got the boot for
giving me some tech literature. And Nady wanted back in around 1992 $69
+S/H to re-channel the 201. I had the info on the xtal parameters and
sent the data to Jan xtal. They made a new set of xtals for $14.99. Took
me 5 minutes to align. Still have the units.

Your diode might suppress some kind of transients in that config. May
help C1 live longer, hard to tell.


--
Live Fast, Die Young and Leave a Pretty Corpse

On Wed, 1 Dec 2010 20:11:33 +0000 (UTC), Meat Plow wrote:

What happens when you replace the diode?

My clit flicks.
--
Don't **** with me. I'm tuff. And stupid but don't dare **** with me.

On Wed, 01 Dec 2010 17:04:09 -0500, Nancy Norelli puked:

On Wed, 1 Dec 2010 20:11:33 +0000 (UTC), Meat Plow wrote:

What happens when you replace the diode?

My clit flicks.

That's a horrific thought.

On Dec 1, 4:46*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 13:28:11 -0800, klem kedidelhopper wrote:
On Dec 1, 3:53*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 12:35:56 -0800, klem kedidelhopper wrote:
On Dec 1, 3:11*pm, Meat Plow wrote:
On Wed, 01 Dec 2010 11:54:20 -0800, klem kedidelhopper wrote:
Someone gave me one of these that he says smoked. I found a small
burned diode, *(looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode
connected to the positive terminal of C1.This part looks like it
must have been a production change as all other parts are labled
on the board but this one the board is not labled for it and so it
looks like it was a factory modification. Tripp Lite won't help me
at all with this problem. So I was hoping that someone might have
run into this before who might have any information on this and/or
perhaps a schematic that they could share. Thanks for any help.
Lenny

What happens when you replace the diode?

--
Live Fast, Die Young and Leave a Pretty Corpse

WelI I haven't replaced it as of yet because I don't know if it was
just a diode or a zener. And not knowing this and what else might be
wrong I wouldn't want to compound the problem. Lenny

If it's a zener it would be clamping voltage on a reg circuit. Not
knowing what C1 is or does it's hard to say what its function is but I
would take an educated guess and say it's not a zener. I suppose you'll
need to figure out how C1 plays into the circuit. Personally I would
ramp the source up using a variac and watch what kind of voltage
developed where the cathode should be and take into consideration C1's
rated voltage and maybe develop a *schematic in my head.

--
Live Fast, Die Young and Leave a Pretty Corpse- Hide quoted text -

- Show quoted text -

Yeah I don't think that its a zener either. Its just that with the
cathode on + it doesn't seem like it could be forward biased so what is
it doing there? I haven't tried to draw it out but this otherwise
appears to be a straight forward 723 based linear regulator circuit. The
way this thing is built though its virtually impossible to reverse
engineer it. I do like your idea of using the variac for testing. I have
a small variac but with a small load on the PR60 ouput I don't think it
should be much of a problem. It ****es me off how uncooperative most of
these manufacturers have gotten in the past few years. Back in the 60's
when I started in electronics you could get anything from most anyone.
Today you would think I was asking for state secrets.This is an obsolete
model. What the hell difference would it make to give me a schematic?
Not like I'm going to try to mass produce these things. I would just
like to get it going for myself. Lenny

Years ago I bought a used Nady 201 that I wanted to switch channels.
Requiredan xtal change and some tweaking of the RF circuits for both the
xmitter and rxcvr. I finally got someone to talk to me at Nady. Even sent
me some schematics. I called back maybe 2 weeks later and that person was
no longer employed there. Seems at least back then it would take a
Wikileak to get any info from Nady. This guy probably got the boot for
giving me some tech literature. And Nady wanted back in around 1992 $69
+S/H to re-channel the 201. I had the info on the xtal parameters and
sent the data to Jan xtal. They made a new set of xtals for $14.99. Took
me 5 minutes to align. Still have the units.

Your diode might suppress some kind of transients in that config. May
help C1 live longer, hard to tell.

--
Live Fast, Die Young and Leave a Pretty Corpse- Hide quoted text -

- Show quoted text -

Maybee I'll replacethe diode with a 1N4004 lets say and plan on
possibly doingthe 723 as well. There are no shorted transistors on the
output so I guess we'll see. It can always go to the metal pile if
need be. Lenny

I saw a reference to the T-L PR-60 PSU schematic being available at this
website (in 2005)
http://www.cbtricks.com/

I don't see the schematic listed, but an email to someone at CB Tricks may
be worthwhile.

Otherwise, a voltage regulator circuit isn't extremely complicated, and many
examples can be found in the ARRL Handbooks (library) or various online
plans.

--
Cheers,
WB
..............


"klem kedidelhopper" wrote in message
...
Someone gave me one of these that he says smoked. I found a small
burned diode, (looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected to
the positive terminal of C1.This part looks like it must have been a
production change as all other parts are labled on the board but this
one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic that
they could share. Thanks for any help. Lenny

"Wild_Bill" wrote in message
...
I saw a reference to the T-L PR-60 PSU schematic being available at this
website (in 2005)
http://www.cbtricks.com/



Is there a crowbar scr in there? It could be a zener used as an overvoltage
protector.

tm

On Dec 1, 8:39*pm, "Wild_Bill" wrote:
I saw a reference to the T-L PR-60 PSU schematic being available at this
website (in 2005)http://www.cbtricks.com/

I don't see the schematic listed, but an email to someone at CB Tricks may
be worthwhile.

Otherwise, a voltage regulator circuit isn't extremely complicated, and many
examples can be found in the ARRL Handbooks (library) or various online
plans.

--
Cheers,
WB
.............

"klem kedidelhopper" wrote in message

...



Someone gave me one of these that he says smoked. I found a small
burned diode, *(looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected to
the positive terminal of C1.This part looks like it must have been a
production change as all other parts are labled on the board but this
one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic that
they could share. Thanks for any help. Lenny- Hide quoted text -

- Show quoted text -

I tried to register on their site but it was an excercise in
frustration. How would I contact anyone there?
Lenny

On Wed, 1 Dec 2010 13:28:11 -0800 (PST) klem kedidelhopper
wrote in Message id:
:

Yeah I don't think that its a zener either. Its just that with the
cathode on + it doesn't seem like it could be forward biased so what
is it doing there?

Reverse voltage protection for the cap?

I have owned this Poor PR60 for years. I have repaired it more times that I can remember. Pass Transistors failed, Caps exploding and Regulator board etc. Here is one solution. Get the regulator board from Astron use Main Transformer, SCR and Pass Transistors.

I have one thats failed mode. I will revert to astron regulator board and single Capacitor. I will post more to follow. It wont be hard.

victor