WOPL dual 500

[grapplesaw]

We have started a new conversion to full complementary with A White Oak Audio revision E control board. It is a bit of a mess but with some trimming up souls come out. Sry clean.

This Will have
14-20 revision E2 control board.
MJ21195/65 transistors
33,000uf power caps
5 watt emitter resistors , etc.

outstanding issues are few but I do have these to concider
1- transistor insulators

as I have new To-3 sockets of the new style I plan to solder the mj transistor pins into the backplate sockets and therefore may want to use mica insulators in place of the silicon pads.

2-decide on blue or red led Meter lights

 

[WOPL Sniffer]

We have started a new conversion to full complementary with A White Oak Audio revision E control board. It is a bit of a mess but with some trimming up souls come out. Sry clean.

This Will have
14-20 revision E2 control board.
MJ21195/65 transistors
33,000uf power caps
5 watt emitter resistors , etc.

outstanding issues are few but I do have these to concider
1- transistor insulators

as I have new To-3 sockets of the new style I plan to solder the mj transistor pins into the backplate sockets and therefore may want to use mica insulators in place of the silicon pads.

2-decide on blue or red led Meter lights

Not familiar with MJ21165,is it a typo???

 

[WOPL Sniffer]

Any reason as to why soldering in the MJ's??? I tried that once...... It was a MOFO to change them out with a failure.

 

[grapplesaw]

Not familiar with MJ21165,is it a typo???

OMG a Typo!!!! they are mj21195/96's

 

[grapplesaw]

Any reason as to why soldering in the MJ's??? I tried that once...... It was a MOFO to change them out with a failure.

Well Perry you are right about the drawbacks. The reason is the new sockets for mouser are different than the original in that the pins go through and contact two flats and are not touching much of the socket where as the old style had a round contact shape and pretty much contacted the entire pin. I have spread the contact tabs apart so to make removal fairly straightforward. The first WOPL I did with Joe's backplates are soldered pins and it is still working well. I do not want any shortcomings with this unit that I can avoid.

 

[WOPL Sniffer]

cool, onward and upward.... too much fun

 

[WOPL Sniffer]

Well Perry you are right about the drawbacks. The reason is the new sockets for mouser are different than the original in that the pins go through and contact two flats and are not touching much of the socket where as the old style had a round contact shape and pretty much contacted the entire pin. I have spread the contact tabs apart so to make removal fairly straightforward. The first WOPL I did with Joe's backplates are soldered pins and it is still working well. I do not want any shortcomings with this unit that I can avoid.

Did I miss your call? I was..... Um, indisposed for a moment.

 

[WOPL Sniffer]

OMG a Typo!!!! they are mj21195/96's

Here is those fans I want to use Glen. They come in many configurations and the base unit is only $21..... They got hem up on the bay too.

http://www.acinfinity.com/cabinet-f...d-av-quiet-cabinet-cooling-fan-system-4-inch/

 

[Gepetto]

We have started a new conversion to full complementary with A White Oak Audio revision E control board. It is a bit of a mess but with some trimming up souls come out. Sry clean.

This Will have
14-20 revision E2 control board.
MJ21195/65 transistors
33,000uf power caps
5 watt emitter resistors , etc.

outstanding issues are few but I do have these to concider
1- transistor insulators

as I have new To-3 sockets of the new style I plan to solder the mj transistor pins into the backplate sockets and therefore may want to use mica insulators in place of the silicon pads.

2-decide on blue or red led Meter lights

What type emitter resistors are you using? Critical!!

 

[grapplesaw]

What type emitter resistors are you using? Critical!!

Glad you asked. They are Panasonic 5 watt metal oxide film
i sure hope they are good for the job. Just bigger version of the Koa I was told.

here is the link to the Panasonic

http://www.mouser.com/ds/2/315/AOA0000C249-951351.pdf

i have used 3 watt kao in the past build

http://www.mouser.com/ds/2/219/MOS-16613.pdf

 

[Gepetto]

Glad you asked. They are Panasonic 5 watt metal oxide film
i sure hope they are good for the job. Just bigger version of the Koa I was told.

here is the link to the Panasonic

http://www.mouser.com/ds/2/315/AOA0000C249-951351.pdf

i have used 3 watt kao in the past build

http://www.mouser.com/ds/2/219/MOS-16613.pdf

Good stuff Glen, MO equals low inductance.

 

[grapplesaw]

Good stuff Glen, MO equals low inductance.

Joe I measured the inductance of three resistors. The Panasonic I am using here, the Koa ones we all use and the original stock ones. They all read within .01 uh of each other.

 

[grapplesaw]

I made some progress today.

Looks like like Joe's board fits nicely

need it pull it apart again and trim up some leads and hook up the bias transistors and start loading the power transistors after finishing the main cap wiring.

 

[laatsch55]

LOVE THE BUSS BAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[grapplesaw]

LOVE THE BUSS BAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I did it to honor of all those who build these things

 

[laatsch55]

Good man Glen, you polished the shit outta it!!

 

[orange]

Somebody buy him a beer, and thank you Canada!

 

[62vauxhall]

Worthy of an engraving.

 

[grapplesaw]

Worthy of an engraving.

right Gary. Then all I would have to do is gold plate it.

 

[62vauxhall]

right Gary. Then all I would have to do is gold plate it.

No need to overboard....chrome should do.