Jer's 400 PLWO Thread

[laatsch55]

In the same hole the others come out of. Remove the slotted screw and bring it through the chassis and into the bracket. With the bracket and tranny bolted in, from left to right C-B-E. The wires come out in the same order that hey were soldered in.

 

[laatsch55]

NavLinear supplied the bare bracket. I installed the 2N5088's in the P strap and soldered the leads and heat shrunk.

 

[NavLinear]

Very cool - glad these are making their way to others. Still waiting for the stars to align to get some more made with mods.

 

[laatsch55]

One of the coolest doo-dads to come accross the bench. Ed showewd some to Dean, and Dean wasn't as excited about em as Ed was . Dean said on the 400 wire tie it to the emitter resistor leads, way hard to do on the 700. Nav that bracket was an elegant solution to a mundane problem.......................................

 

[jbeckva]

WE HAVE IGNITION!



Offset steady at -10mV both channels



Bias ... right where it needs to be...



Getting the dummy loads out!! Cross your fingers!

 

[jbeckva]

No issues on the wave/load test!! This is doing about 10vRMS @ 15KHz - rock steady!



Max output (could not get it to clip, 5A on the positive rail blew beforehand) - Approx 43 volts RMS = 231 watts!

I did notice the DCP kicking in a little... I seem to remember that being a known issue?

Anywhoo... tomorrow night I'll get the meters and new LED lightboard together, then do some good listening tests! THE BEASTIE LIVES BUAH HA HA HAA HAAAAA!!!

 

[laatsch55]

Anything else?? To cross I mean...

 

[jbeckva]

Anything else?? To cross I mean...

What are you talking about, Lee?

 

[laatsch55]

I did notice the DCP kicking in a little... I seem to remember that being a known issue?




That was a concern Don was addressing with the north of 5 ohms recommendation.

 

[laatsch55]

What are you talking about, Lee?

Toes , elbows, legs, etc...

 

[laatsch55]

Pretty neat job there Jer..

 

[jbeckva]

Toes , elbows, legs, etc...

eyeballs??? lol

Might go find me some 6 or 7 ohm MOS resistors, eh? Still looking good nuff to hook up some speaks (tomorrow tho.. aint got 'nuff gas left for tonight)

 

[laatsch55]

If you have some original PL zoebels about 90% of those paralleled resistors measure 6.1-7.0 ohms../.

 

[laatsch55]

The blowing of a fuse before it clips is not a good sign. What do your loads ohm at??


Take that with a grain of salt though Jer, not that rare an occurance.

 

[jbeckva]

If you have some original PL zoebels about 90% of those paralleled resistors measure 6.1-7.0 ohms../.

Yeah I still have those, but also I realized something after the fact - on the '400 they are 1 watt resistors, so a single 2 watt would work fine right? I was shopping for 5 watters, so the 4.7 was the best I could find at the time...

I like the idea of a single instead of doubling them up - just "neater" IMO..

 

[jbeckva]

The blowing of a fuse before it clips is not a good sign. What do your loads ohm at??


Take that with a grain of salt though Jer, not that rare an occurance.

With 5 amp fuses it was bound to happen, right? 231 watts @ 8 ohms gives ya 5.3 amps going... that and the DCP flip-flopping probably did it with the surge with the load being connected.. disconnected.. connected again with the DCP relay.

 

[laatsch55]

I think the 400s spec'sd 2 watters, nope, just looked. PL400C, PL 14A were 1 watt ,ten ohmers. PL14 B called for 12 ohm 1 watters.

 

[laatsch55]

That's what the manual says but I've never seen a 1 watt in there...

 

[jbeckva]

This guy would be better, eh?

http://www.digikey.com/product-detail/en/ERX-2SJ6R2A/P6.2W-2TR-ND/78314

 

[laatsch55]

With 5 amp fuses it was bound to happen, right? 231 watts @ 8 ohms gives ya 5.3 amps going... that and the DCP flip-flopping probably did it with the surge with the load being connected.. disconnected.. connected again with the DCP relay.

Yes and there was a warning about needing 8 ampers for sine wave testing if needed.