PCB sockets for plug-in xtors/etc.


Dave Peterson
 

Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?

Dave


 

Hi Dave,
These are the ones I use with their corresponding DIgiKey and Mouser part numbers:
Mill-Max Part Numbers
917-93-103-41-005000 CONN TRANSIST TO-5 3POS GOLD
0552-2-15-01-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
0552-2-15-15-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
All three of these are still available from DigiKey.

Mouser Part Numbers
575-055220 Mill-Max 0.015-.022” pin, 0.170” deep, for small transistors & small in-line pkgs.
575-0293015 Mill-Max 0.022-.034” pin, 0.170” deep, for TO-66 transistors
575-031400 Mill-Max 0.032-.046” pin, 0.236” deep, for TO-3 transistors & large in-line pkgs.
Only two are available now from Mouser.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Peterson via groups.io
Sent: Wednesday, March 03, 2021 10:34 AM
To: TekScopes@groups.io
Subject: [TekScopes] PCB sockets for plug-in xtors/etc.

Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?

Dave







--
Dennis Tillman W7pF
TekScopes Moderator


 

Dennis,

So it doesn't look like any of the available sockets (at Mouser, at least) have the silicone gaskets that the Tek sockets seem to have. Do you know if that was something Tek did themselves?

-- Jeff Dutky


 

Hi Jeff,

I always wondered what the Tek PCB sockets were filled with and was that stuff really necessary?

The Tek PCB sockets are really great. I wish there was someone selling something like them now. I didn't find any other manufacturers of PCB pin sockets other than Milli-Max. Maybe someone else can locate a company that makes the kind that have a filler in them and explain how the filler helps the socket make better contact.

I always wondered how a wire was able to make contact with the inside of the Tek PCB sockets since the filler material (whatever it is) may get in the way of making contact to the socket.
I haven't tried to see if the filler material is conductive but I always assumed it isn't conductive at all.

If I remember correctly the Milli-Max pins I used have three spring fingers that press inward inside the socket where they grip the wires of the part. I like that idea because it tells me these sockets have the greatest area in contact with the wire.

40 years ago I worked for a company that used pins similar to the ones Tek used. They were filled with a similar material. They came on a flexible 1/4" mylar ribbon for automatic insertion into a PCB. These were square unlike the Tek ones which are round. These also required a 40% bigger hole in the PCB partially (a drawback) because they were square.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jeff Dutky
Sent: Wednesday, March 03, 2021 12:10 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] PCB sockets for plug-in xtors/etc.

Dennis,

So it doesn't look like any of the available sockets (at Mouser, at least) have the silicone gaskets that the Tek sockets seem to have. Do you know if that was something Tek did themselves?

-- Jeff Dutky







--
Dennis Tillman W7pF
TekScopes Moderator


Larry McDavid
 

Dennis, do you know the appropriate finish hole size in the PWB for each of these replacement sockets?

Larry

On 3/3/2021 11:02 AM, Dennis Tillman W7pF wrote:
Hi Dave,
These are the ones I use with their corresponding DIgiKey and Mouser part numbers:
Mill-Max Part Numbers
917-93-103-41-005000 CONN TRANSIST TO-5 3POS GOLD
0552-2-15-01-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
0552-2-15-15-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
All three of these are still available from DigiKey.
Mouser Part Numbers
575-055220 Mill-Max 0.015-.022” pin, 0.170” deep, for small transistors & small in-line pkgs.
575-0293015 Mill-Max 0.022-.034” pin, 0.170” deep, for TO-66 transistors
575-031400 Mill-Max 0.032-.046” pin, 0.236” deep, for TO-3 transistors & large in-line pkgs.
Only two are available now from Mouser.
Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Peterson via groups.io
Sent: Wednesday, March 03, 2021 10:34 AM
To: TekScopes@groups.io
Subject: [TekScopes] PCB sockets for plug-in xtors/etc.
Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?
Dave
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


 

Dennis Tillman wrote:

40 years ago I worked for a company that used pins similar to the ones Tek used.
They were filled with a similar material. They came on a flexible 1/4" mylar ribbon
for automatic insertion into a PCB.
I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a seal or gasket just like the Tek sockets. I was unable to find modern equivalents with the seal/gasket. I ended up ordering several strips of Advanced Interconnections Peel-A-Way sockets, but my sources for those have subsequently dried up.

-- Jeff Dutky


Larry McDavid
 

Sorry, Dennis, wrong question before. what is the spacing of the three pins and are the spacing angles 120°? Or, what pattern?

The datasheet at DigiKey does not come up.

Larry

On 3/3/2021 11:02 AM, Dennis Tillman W7pF wrote:
Hi Dave,
These are the ones I use with their corresponding DIgiKey and Mouser part numbers:
Mill-Max Part Numbers
917-93-103-41-005000 CONN TRANSIST TO-5 3POS GOLD
0552-2-15-01-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
0552-2-15-15-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
All three of these are still available from DigiKey.
Mouser Part Numbers
575-055220 Mill-Max 0.015-.022” pin, 0.170” deep, for small transistors & small in-line pkgs.
575-0293015 Mill-Max 0.022-.034” pin, 0.170” deep, for TO-66 transistors
575-031400 Mill-Max 0.032-.046” pin, 0.236” deep, for TO-3 transistors & large in-line pkgs.
Only two are available now from Mouser.
Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Peterson via groups.io
Sent: Wednesday, March 03, 2021 10:34 AM
To: TekScopes@groups.io
Subject: [TekScopes] PCB sockets for plug-in xtors/etc.
Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?
Dave
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


teamlarryohio
 

The ones spec'd in the B25+ 465 manual are Berg 75060, which appear to be deceased. But like Mill-Max, it's a starting point.
-ls-


 

Dennis Tillman wrote:

I always wondered what the Tek PCB sockets were filled with and was that stuff really necessary?
I'm only guessing that it's silicone. I've not gotten a great look at it, actually. I thought, in the GRiD laptops, that it was a solid seal over the top of the socket, based on first encountering it in the sockets for an unpopulated 8087, but that may also be inaccurate.

-- Jeff Dutky


Vince Vielhaber
 

On 03/03/2021 04:51 PM, Jeff Dutky wrote:
Dennis Tillman wrote:

40 years ago I worked for a company that used pins similar to the ones Tek used.
They were filled with a similar material. They came on a flexible 1/4" mylar ribbon
for automatic insertion into a PCB.
I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a seal or gasket just like the Tek sockets. I was unable to find modern equivalents with the seal/gasket. I ended up ordering several strips of Advanced Interconnections Peel-A-Way sockets, but my sources for those have subsequently dried up.

-- Jeff Dutky