Topics

468 with no -2450

Michael A. Terrell
 

No, it was failing memory. That was from 40 years ago. :(

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 26, 2017 8:20 AM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

40673...Lysdexia strikes again ;-)

Tin plating was very common.... unfortunately. In many cases,
the bright tin plating was also inside of the can, and created
the infamous tin whiskers, and rendered the device inert.

-Chuck Harris

'Michael A. Terrell' mike.terrell@... [TekScopes] wrote:
Most of what I saw were tin plated TO-5 or TO-3 cans, in PA amplifiers when I did industrial repairs.

The 40763 was a popular Dual Gate, N-channel RCA FET in that five digit line. I replaced dozens, if not hundreds of those in 'Linear' brand garage door openers for a friend's 'Overhead Door Company' dealership. I believe that they were in four lead, TO-1 cans. We bought them 25 or more at a time, because he had many thousands of the old openers still in service. They were about 16 cents each, but now they can go for $16 each, when some turn up.

-----Original Message-----
From: "David @DWH [TekScopes]" <TekScopes@...>
Sent: May 26, 2017 12:31 AM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

Somewhere I have the RCA transistor databook with those 5 digit
transistors.

The thing I always remember about them is that they used nickel plated
steel cases which tended to rust.

On Thu, 25 May 2017 23:36:34 -0400 (GMT-04:00), you wrote:

RCA used to used a five digit code for semiconductors that hadn't been assigned a JEDEC number. Their predecessor to the 2N3055 was a 100 V version that they called the 40411. It was part of a consecutive set from 40406-40411 for their first Quasi-Complementary 701W audio amplifier design which was shown in their semiconductor handbook, around 1970. There was no stated logic for the numbering, and it appeared to just be sequential. Once they were assigned a JEDEC number, the old numbering was removed from current literature, making it difficult to find any data.

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 25, 2017 8:12 PM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....
Michael A. Terrell

Michael A. Terrell


------------------------------------
Posted by: "Michael A. Terrell" <mike.terrell@...>
------------------------------------


------------------------------------

Yahoo Groups Links




Michael A. Terrell

Chuck Harris
 

40673...Lysdexia strikes again ;-)

Tin plating was very common.... unfortunately. In many cases,
the bright tin plating was also inside of the can, and created
the infamous tin whiskers, and rendered the device inert.

-Chuck Harris

'Michael A. Terrell' mike.terrell@... [TekScopes] wrote:

Most of what I saw were tin plated TO-5 or TO-3 cans, in PA amplifiers when I did industrial repairs.

The 40763 was a popular Dual Gate, N-channel RCA FET in that five digit line. I replaced dozens, if not hundreds of those in 'Linear' brand garage door openers for a friend's 'Overhead Door Company' dealership. I believe that they were in four lead, TO-1 cans. We bought them 25 or more at a time, because he had many thousands of the old openers still in service. They were about 16 cents each, but now they can go for $16 each, when some turn up.

-----Original Message-----
From: "David @DWH [TekScopes]" <TekScopes@...>
Sent: May 26, 2017 12:31 AM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

Somewhere I have the RCA transistor databook with those 5 digit
transistors.

The thing I always remember about them is that they used nickel plated
steel cases which tended to rust.

On Thu, 25 May 2017 23:36:34 -0400 (GMT-04:00), you wrote:

RCA used to used a five digit code for semiconductors that hadn't been assigned a JEDEC number. Their predecessor to the 2N3055 was a 100 V version that they called the 40411. It was part of a consecutive set from 40406-40411 for their first Quasi-Complementary 701W audio amplifier design which was shown in their semiconductor handbook, around 1970. There was no stated logic for the numbering, and it appeared to just be sequential. Once they were assigned a JEDEC number, the old numbering was removed from current literature, making it difficult to find any data.

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 25, 2017 8:12 PM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....
Michael A. Terrell

Michael A. Terrell


------------------------------------
Posted by: "Michael A. Terrell" <mike.terrell@...>
------------------------------------


------------------------------------

Yahoo Groups Links



Michael A. Terrell
 

Most of what I saw were tin plated TO-5 or TO-3 cans, in PA amplifiers when I did industrial repairs.

The 40763 was a popular Dual Gate, N-channel RCA FET in that five digit line. I replaced dozens, if not hundreds of those in 'Linear' brand garage door openers for a friend's 'Overhead Door Company' dealership. I believe that they were in four lead, TO-1 cans. We bought them 25 or more at a time, because he had many thousands of the old openers still in service. They were about 16 cents each, but now they can go for $16 each, when some turn up.

-----Original Message-----
From: "David @DWH [TekScopes]" <TekScopes@...>
Sent: May 26, 2017 12:31 AM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

Somewhere I have the RCA transistor databook with those 5 digit
transistors.

The thing I always remember about them is that they used nickel plated
steel cases which tended to rust.

On Thu, 25 May 2017 23:36:34 -0400 (GMT-04:00), you wrote:

RCA used to used a five digit code for semiconductors that hadn't been assigned a JEDEC number. Their predecessor to the 2N3055 was a 100 V version that they called the 40411. It was part of a consecutive set from 40406-40411 for their first Quasi-Complementary 701W audio amplifier design which was shown in their semiconductor handbook, around 1970. There was no stated logic for the numbering, and it appeared to just be sequential. Once they were assigned a JEDEC number, the old numbering was removed from current literature, making it difficult to find any data.

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 25, 2017 8:12 PM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....
Michael A. Terrell

Michael A. Terrell

 

Somewhere I have the RCA transistor databook with those 5 digit
transistors.

The thing I always remember about them is that they used nickel plated
steel cases which tended to rust.

On Thu, 25 May 2017 23:36:34 -0400 (GMT-04:00), you wrote:

RCA used to used a five digit code for semiconductors that hadn't been assigned a JEDEC number. Their predecessor to the 2N3055 was a 100 V version that they called the 40411. It was part of a consecutive set from 40406-40411 for their first Quasi-Complementary 701W audio amplifier design which was shown in their semiconductor handbook, around 1970. There was no stated logic for the numbering, and it appeared to just be sequential. Once they were assigned a JEDEC number, the old numbering was removed from current literature, making it difficult to find any data.

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 25, 2017 8:12 PM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....
Michael A. Terrell

Michael A. Terrell
 

RCA used to used a five digit code for semiconductors that hadn't been assigned a JEDEC number. Their predecessor to the 2N3055 was a 100 V version that they called the 40411. It was part of a consecutive set from 40406-40411 for their first Quasi-Complementary 701W audio amplifier design which was shown in their semiconductor handbook, around 1970. There was no stated logic for the numbering, and it appeared to just be sequential. Once they were assigned a JEDEC number, the old numbering was removed from current literature, making it difficult to find any data.

-----Original Message-----
From: "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...>
Sent: May 25, 2017 8:12 PM
To: TekScopes@...
Subject: Re: [TekScopes] 468 with no -2450

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....
Michael A. Terrell

Samuel Rocha <py1dkw@...>
 

Hi Chuck and the Group,
Yes, you are correct concerning the Q110B (see picture) and not Q110 as described, my copy was hard to read.
There is an interesting matter, concerning the described out of oscillation before the fuse and transistor blown up, unfortunately first the Q110B and next the 1,5 A fuse:
In order to oscillate, I had disconnected both the home made multiplier and the diode after the secondary. Next, I placed a -4,5 V supply into the base of Q110B and earth. I managed to get a spark from the HV transformer to the HV diode. But if I switched the scope off and on, I had no oscillation, no HV. This was after changing the capacitors.Yes, for a few moments I was happy looking a small horizontal trace, besides having no 15 kV.
Next, I connected a TIP3055 in Q110B place, but no sign of HV, it seems to me I have now two problems together: finding a proper good and old 2N3055 ( easy for me) and find why there is no oscillation (difficult part) . I had checked with another scope and the frequency was 63 kHz when it was working. At least the HV transformer seems to be in good shape.
I think this oscillator is rather hard to work and even worse to repair!
Regards to all,Sam RochaPY1 DKW
.

Em Quinta-feira, 25 de Maio de 2017 21:13, "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...> escreveu:


  AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....

In the tektronix semiconductor cross reference, it is
listed as a type 2N3055H.

It appears among a few other 2N3055H's that each have
different 151 numbers, but the 0140 has the lowest ft,
being 300KHz. The others have ft = 800KHz.

The ft is important, as the transistor is hanging on
a long set of leads, and too high of an ft will help
it to oscillate in the HF bands somewhere.

Most readily available 2N3055's today are a totally
different internal geometry from the low ft type made
back in the 1960's. You may have trouble finding a
new unit. Anything pulled from really old (1960's)
stuff should be fine.

C104 is a popular failure. It is the feedback filter
for the HV regulation loop. I think I mentioned the
possibility a month or so ago, but I forget.

-Chuck Harris

Samuel Rocha py1dkw@... [TekScopes] wrote:

Hi Group!
I had found Q110 in short.
Which transistor should I use for RCA 36568?
Regards to ALL,
Sam





Enviado do Yahoo Mail. Baixe o aplicativo

--------------------------------------------
Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2450
Para: TekScopes@...
Data: Quinta-feira, 25 de Maio de 2017, 16:47












Hi Group!

My 468 still gives no sign of -2450v.

I wrote the transistors voltages,It may give you an Idea, I
am working in It for some months already with no success.

Many thanks again

Sam Rocha



--------------------------------------------

Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes]
<TekScopes@...> escreveu:



Assunto: Re: [TekScopes] 468 with no -2450

Para: TekScopes@...

Data: Quinta-feira, 25 de Maio de 2017, 16:00

























Hi Group,







I Have found some diodes 1n4152 and Q533 deffective,
which

were replaced by 1n4148 and BC328.



Now, I discovered that Q109-35495 ( Q1416 in The 465

diagram) is bad.



I need to know which transistor should I replaced It,
better

If It matches the BC/Philips line available in Brazil.



Many thanks again.



Sam







Enviado do Yahoo Mail. Baixe o aplicativo























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------------------------------------
Posted by: Samuel Rocha <py1dkw@...>
------------------------------------


------------------------------------

Yahoo Groups Links



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[Non-text portions of this message have been removed]

Chuck Harris
 

AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....

In the tektronix semiconductor cross reference, it is
listed as a type 2N3055H.

It appears among a few other 2N3055H's that each have
different 151 numbers, but the 0140 has the lowest ft,
being 300KHz. The others have ft = 800KHz.

The ft is important, as the transistor is hanging on
a long set of leads, and too high of an ft will help
it to oscillate in the HF bands somewhere.

Most readily available 2N3055's today are a totally
different internal geometry from the low ft type made
back in the 1960's. You may have trouble finding a
new unit. Anything pulled from really old (1960's)
stuff should be fine.

C104 is a popular failure. It is the feedback filter
for the HV regulation loop. I think I mentioned the
possibility a month or so ago, but I forget.

-Chuck Harris

Samuel Rocha py1dkw@... [TekScopes] wrote:


Hi Group!
I had found Q110 in short.
Which transistor should I use for RCA 36568?
Regards to ALL,
Sam





Enviado do Yahoo Mail. Baixe o aplicativo

--------------------------------------------
Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2450
Para: TekScopes@...
Data: Quinta-feira, 25 de Maio de 2017, 16:47












Hi Group!

My 468 still gives no sign of -2450v.

I wrote the transistors voltages,It may give you an Idea, I
am working in It for some months already with no success.

Many thanks again

Sam Rocha



--------------------------------------------

Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes]
<TekScopes@...> escreveu:



Assunto: Re: [TekScopes] 468 with no -2450

Para: TekScopes@...

Data: Quinta-feira, 25 de Maio de 2017, 16:00

























Hi Group,







I Have found some diodes 1n4152 and Q533 deffective,
which

were replaced by 1n4148 and BC328.



Now, I discovered that Q109-35495 ( Q1416 in The 465

diagram) is bad.



I need to know which transistor should I replaced It,
better

If It matches the BC/Philips line available in Brazil.



Many thanks again.



Sam







Enviado do Yahoo Mail. Baixe o aplicativo























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------------------------------------
Posted by: Samuel Rocha <py1dkw@...>
------------------------------------


------------------------------------

Yahoo Groups Links



Samuel Rocha <py1dkw@...>
 

Hi Group!
I had found Q110 in short.
Which transistor should I use for RCA 36568?
Regards to ALL,
Sam





Enviado do Yahoo Mail. Baixe o aplicativo

--------------------------------------------
Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2450
Para: TekScopes@...
Data: Quinta-feira, 25 de Maio de 2017, 16:47


 









Hi Group!

My 468 still gives no sign of -2450v.

I wrote the transistors voltages,It may give you an Idea, I
am working in It for some months already with no success.

Many thanks again

Sam Rocha



--------------------------------------------

Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes]
<TekScopes@...> escreveu:



Assunto: Re: [TekScopes] 468 with no -2450

Para: TekScopes@...

Data: Quinta-feira, 25 de Maio de 2017, 16:00





 



















Hi Group,







I Have found some diodes 1n4152 and Q533 deffective,
which

were replaced by 1n4148 and BC328.



Now, I discovered that Q109-35495 ( Q1416 in The 465

diagram) is bad.



I need to know which transistor should I replaced It,
better

If It matches the BC/Philips line available in Brazil.



Many thanks again.



Sam







Enviado do Yahoo Mail. Baixe o aplicativo























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Samuel Rocha <py1dkw@...>
 

Hi Group!
My 468 still gives no sign of -2450v.
I wrote the transistors voltages,It may give you an Idea, I am working in It for some months already with no success.
Many thanks again
Sam Rocha








--------------------------------------------
Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2450
Para: TekScopes@...
Data: Quinta-feira, 25 de Maio de 2017, 16:00


 









Hi Group,



I Have found some diodes 1n4152 and Q533 deffective, which
were replaced by 1n4148 and BC328.

Now, I discovered that Q109-35495 ( Q1416 in The 465
diagram) is bad.

I need to know which transistor should I replaced It, better
If It matches the BC/Philips line available in Brazil.

Many thanks again.

Sam



Enviado do Yahoo Mail. Baixe o aplicativo











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[Non-text portions of this message have been removed]

Samuel Rocha <py1dkw@...>
 

Hi Group,

I Have found some diodes 1n4152 and Q533 deffective, which were replaced by 1n4148 and BC328.
Now, I discovered that Q109-35495 ( Q1416 in The 465 diagram) is bad.
I need to know which transistor should I replaced It, better If It matches the BC/Philips line available in Brazil.
Many thanks again.
Sam






Enviado do Yahoo Mail. Baixe o aplicativo

Samuel Rocha <py1dkw@...>
 

Dear Group,
I had changed the MC1458 and both supplies are now good.
But still no -2450 v!
Regards to ALL,
Sam Rocha






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--------------------------------------------
Em qui, 18/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2459 v
Para: "David" <@DWH>, "TekScopes@..." <TekScopes@...>
Data: Quinta-feira, 18 de Maio de 2017, 11:50


 









Dear Group,

Sorry, completing the message:



Well, meanwhile I could repair the 55V supply. The VR725
diode, 9,1 v was open, replaced by a 9.1v/1W. This repaired
the +55v, the +15v is ok.Now, the  +5 v  supply is +7.0v
and the -8 v supply is -12v.

I checked the Q401,Q402,Q402, Q617 onboard and Q718 out of
board, they seems to be good with an analog Simpson7
multimeter,

Just for checking the influence of one suplly in tho the
other, I disconnected CR304 in collector of Q402 and
connected it to a +5v supply, still the -8v gives -12v.

I suspect the U506 is faulty. The measures in U506 are:Pin
1= +9,7Pin 2=+17

Pin 3=+5

Pin 4= -12,4Pin 5 =-3,8Pin 6 =0Pin 7 =+2,3Pin8 =+15Is it
possible to remove the  U506 without taking the interface
board out? I think I will have to destroy it cutting all ic
legs and soldering a 8 pin socket.Any ideas about these two
power supplies repair?

many thanks, nice weekend for all And Keep your world blue
as TEKTRONIX !!Sam Rocha 



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Em Quinta-feira, 18 de Maio de 2017 11:40, Samuel Rocha
<py1dkw@...> escreveu:





Dear Group

Well, meanwhile I could repair the 55V supply. The VR725
diode, 9,1 v was open, replaced by a 9.1v/1W. This repaired
the +55v, the +15v is ok.Now, the  +5 v  supply is +7.0v
and the -8 v supply is -12v.

I checked the Q401,Q402,Q402, Q617 onboard and Q718 out of
board, they seems to be good with an analog Simpson7
multimeter,

Just for checking the influence of one suplly in tho the
other, I disconnected CR304 in collector of Q402 and
connected it to a +5v supply, still the -8v gives -12v.

I suspect the U506 is faulty. The measures in U506
are:Pin Pin 

Pin 

 



Enviado do Yahoo Mail. Baixe o aplicativo



Em Terça-feira, 16 de Maio de 2017 3:42, David
<@DWH> escreveu:





On Fri, 12 May 2017 01:30:57 +0000 (UTC), you wrote:





>Dear David ,

>Thank you very much for your attention and answer.

>Confirming the tested voltages:-2450 => zero Volts

>+110 => +110,8 Volts

>-8 did not test

>

>+15v= +15v5v gives 6.75 Volts (higher voltage)



What?  So the +5 volt supply is actually +6.75 volts?  If
so that

needs to be fixed before all else.  A high voltage could
damage the

logic circuits.



[Non-text portions of this message have been removed]













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