Derek92994's 700 Ser II White Oak conversion

[laatsch55]

TO-3's in particular they are the MJ 21195, 21196 complementary pairs....

 

[gadget73]

Coolness Bud. I need the AC feed voltage to the meter boards...

With 122vac from the wall, I get 11.8 vac to the meter boards.

 

[laatsch55]

Thanks Bud. That's exactly what we needed...

 

[Gepetto]

Thanks Bud. That's exactly what we needed...

Then light board ballast resistors go from 150 to 402 ohms

Filter caps go from 15KuF, 10V to 10KuF, 25V

 

[laatsch55]

Thanks Joe. Still in the field. Wasn't to bad a disaster. I'll be back at the house in a bit.

 

[NavLinear]

Thanks Dennis
I found these new old stock Nichicon caps QXF2J223KRPT 630 volt .022 mdf Polypropylene
100 lot for $35 . Do these thing go bad over time ? is this a good deal or should I go new? Anyone got best choice part # for this job?

Here's a choice or two from Mouser Electronics:

http://www.mouser.com/ProductDetail...=/ha2pyFaduh6Q3oaTL7FlSbfr7Phq0eR103m1ccc5v0=

http://www.mouser.com/ProductDetail...GAEpiMZZMv1cc3ydrPrF0%2bjlB8SXIRujuI8ZMOgY6Q=

The price IMO isn't bad for the Nichicon caps - if you don't need 100 you can get new ones to do the job. Mouser is one of the go to electronic distributers so you could bundle this with other items such as the bridge rectifier and new output transistors. The Nichicon caps should still be good to use if you decide to go in that direction.

 

[gadget73]

Caps can fail from age. I don't like using old ones. I figure if I'm replacing old caps, there is no good reason to install different old caps. Thats like replacing bald tires with a different brand of bald tire.

 

[derek92994]

Does gadget have the 240 volt version as well?

 

[laatsch55]

Electrolytic caps fail with age....

 

[laatsch55]

Does gadget have the 240 volt version as well?

No. We needed the secondary low voltage winding. Primary has no effect on that winding...

 

[derek92994]

Have you talked to anyone (engineers etc) about a water cooled design for the WOPLs using radiator, pump and fan?

 

[laatsch55]

The idea has been bantied about.....large copper heatsinks worked well...

 

[derek92994]

The idea has been bantied about.....large copper heatsinks worked well...

Yeah I have to admit, air cooling works fine for my PC, when overclocking and video encoding I am hitting core temps of 80 celcius and surface temps of 60c which is well within the chip's limits. I down clock the cpu back to stock speed and voltage when doing basic tasks the majority of the time. Stock speed is even sufficient for audio editing with the use of multiple SSD and RAM drives as its more transfer rate based rather than CPU based.

 

[derek92994]

Is there anyone out there with a WOPL 700 or higher that can idle their amp with nothing playing through it and monitor what the watt usage is at idle please? (from the wall socket)

 

[laatsch55]

Yeah I have to admit, air cooling works fine for my PC, when overclocking and video encoding I am hitting core temps of 80 celcius and surface temps of 60c which is well within the chip's limits. I down clock the cpu back to stock speed and voltage when doing basic tasks the majority of the time. Stock speed is even sufficient for audio editing with the use of multiple SSD and RAM drives as its more transfer rate based rather than CPU based.

OK.....

 

[derek92994]

I'll explain more. There are two important pipe lines with the PC, the CPU which does all the thinking and processing (e.g. crackle filtering, EQing, sample conversion, video format encoding (very heavy processing). And the transfer rate of the drives which stream the data to the storage device upon saving or during processing itself. These two have to be fast and work efficiently together. A mechanical hard disk has an average transfer rate of around 120 megs per second and an access time of around 12ms (as it has to wait for the rotating disk to come to the part where the data is stored for reading and writing, also the head actuator has to seek to that spot on the disk), where as a solid state drive (no moving parts, pure chip based) goes upwards of 500 megs per second transfer rate and has an access time which is a fraction of a ms. Ram drive which is the system memory on the board of your PC is even faster which is approx 22000 megs per second and even faster access time to boot. So if you avoid using mechanical drives when processing/saving audio and video data, and use a combination of the RAM and solid state drive, it is super fast and efficient. It provides a much larger pipe line to feed the central processing unit so it can work at its peak 100% as it is not being starved of data for the task at hand, or in other words, does not have to wait for the data to be fed to it. There is also less chance of Cyclic redundancy errors with non moving parts drives, which takes up time and in very rare cases can corrupt data if the CRC check errors out and fails to correct properly.

 

[laatsch55]

I think I even understood some of that....

 

[derek92994]

Kind of like a pipe line and eliminating bottle neck effects. Like providing an amp with stable voltage to run at peak performance.

 

[laatsch55]

Yes, I saw that...

 

[laatsch55]

Putting together the DCP....