So, here I go. Phase Linear 400

[VSAT88]

Now I will ask a question that I know the answer to. I will not assume anything and I will follow direction. The amp has two C6 Capacitors, both at the very top of the main board I should put double didoes back to back in reverse of each other on BOTH C6 Capacitors on the bottom of the board..Correct ?

 

[laatsch55]

Absolutely. And make sure the leads do not touch anything else when done soldering.
When you get done wit that , take a pic and post it.

 

[laatsch55]

And then you can reinstall the bottom row of transistors and bring it up on the variac and DBT.

Often times when an output goes on a stock PL, Q7, Q10 may have taken a hit, so, do a diode check in circuit on those two before powering up. We're just checking for open and shorts on those 2 in circuit.

 

[laatsch55]

Q7, Q10 may take a hit on the White Oak board too, but it doesn't seem to be a problem as much as a stocker.

 

[VSAT88]

Absolutely. And make sure the leads do not touch anything else when done soldering.
When you get done wit that , take a pic and post it.

Here goes.

 

[WOPL Sniffer]

Today was Diode Tuesday ! Nice. Thank you Mr. WOPL S.

No problem. Good luck. Lee will take care of you.

 

[laatsch55]

Here goes. View attachment 30417 View attachment 30418 View attachment 30419

Ok, looks good, the only other cautionary note is when you bolt the board back to the standoffs check clearance between the diodes and the backwall....

 

[laatsch55]

Fuses??????

 

[VSAT88]

Fuses??????

Main and Rail fuses right ? I need to go pick some up later on tonight. If that is what you mean and I really hope you do.

 

[VSAT88]

Ok, looks good, the only other cautionary note is when you bolt the board back to the standoffs check clearance between the diodes and the backwall....

I did go ahead and check that.

 

[laatsch55]

Yes, rail and mains fuses...

 

[VSAT88]

Yes, rail and mains fuses...

So, standard sizes right ? one 15 and two 8 amp fuses if I remember correctly.

 

[Gepetto]

So, standard sizes right ? one 15 and two 8 amp fuses if I remember correctly.

If it is a 400 then AC is 8A AGC and the 2 rail fuses are 5A AGX

 

[VSAT88]

If it is a 400 then AC is 8A AGC and the 2 rail fuses are 5A AGX

Got ya but not the fuses. Unfortunatly it seems as if I have every fuse under the sun (including 1960's VW) except..Yep, you guessed it. No 8A and no 5A fuses. hope to source locally.

And then you can reinstall the bottom row of transistors and bring it up on the variac and DBT.

Often times when an output goes on a stock PL, Q7, Q10 may have taken a hit, so, do a diode check in circuit on those two before powering up. We're just checking for open and shorts on those 2 in circuit.

Did just that, installed all the drivers and I suppose I was not as careful as I thought. Stripped out two holes. Fixed with small machine screws and nuts. They fit well without getting near any components or leads/wire. And yes sir, I did check Q7, Q10. All seems well with them, nothing open and nothing shorted. Off grid for tonight that way I wont tear anything else up. Thanks again Gents.

 

[laatsch55]

Hookay, fire up tomorrow eh?

 

[VSAT88]

Hookay, fire up tomorrow eh?

Got inside and looked at the PC and oh yes I am gonna fire it right on up tomorrow. I was thinking to myself as I came into the office that I am going to fix that G.D. thing if it takes me the rest of my life and every bit of spare $ I have until then !

 

[VSAT88]

Fuses in place. DBT and Veriac. When I hit 90 V or so the bulb goes bright and stays bright . 100 w bulb in DBT

 

[VSAT88]

The bulb does not strobe like a disco any longer..lol..Forgot to mention that.

 

[laatsch55]

Stop just before the bulb goes bright and measure DC offset, then watch what it jumps to when the bulb goes bright...

 

[VSAT88]

R channel stays around 20 mV until the bulb goes bright then 30 mV. The left just before it goes bright is 9.3 v then drops to around 4.9 V