Waveform Interpretation needed.

[mlucitt]

I would be curious about the ESR on your not yet installed Black Gates. Well, the installed ones too but I am not about to ask you to lift a lead just for me. Except maybe those C11s.

I have never seen a side-by-side comparison of ESR in BG to say, Nichicon Muse or Elna Silmic II.

Could it happen?

 

[laatsch55]

It could Mark. There are not any "not yet installed BG's". I will pull C11.

 

[Gepetto]

Are both channels exhibiting the same thing Lee?

 

[Gepetto]

What does the signal look like at the bottom side of R18?

 

[laatsch55]

Joe, was home all day with a bug of some sort. Barely able to type without fallling asleep. I'll do the suggested tomporrow, thank you though.

 

[Gepetto]

Get well Lee, we are on your schedule...

 

[mlucitt]

A good bug killer is a few shot of single malt scotch.

 

[laatsch55]

Don't know about that Joe. Your expertise is never taken for granted from here man, appreciate every second of the time you're able to spare us.

Mark--Amen.

 

[laatsch55]

Going to bed guys, thanks. Got that hurry up job this weekend on James Burkes 400, shou;ld be no problem should it Joe? Nothing weird about the cap swapout? Got some Imlay DC protect going in too.

 

[Gepetto]

Mark is the expert on this transplant Lee. Only trick is need to fabricate a new copper bus bar for the cap to cap span.

 

[laatsch55]

Well in THAT CASE, I just happen to have BAD ASS bus bar out the ying yang!! In fact had cleane some 1/2 by 1/8 up this weekend, must be psychic.

 

[Gepetto]

When you install the cap clamps that are in the kit, the new clamps are 2 screw type vs 3 screw on the original cap clamps. The 2 screw clamps fit into 2 of the original 3 holes so no chassis drilling is required. However this put the plus to minus post connections slightly farther apart than the original caps driving the need for a new bus bar with slighly wider and I believe a small dogleg in one end. This is for the early PL400 Series 1 where the caps were mounted to the left sidewall of the amp.

 

[laatsch55]

Ok Joe. The 1/2 inch wide bus bars allow for an offset with 10/32's, no bend required, thank you Sir.

 

[laatsch55]

Not seeing anything on either channel till I get to 22KHZ then there is a slight deformation as the waveform starts to go down from the apex, This is UNLOADED, fixin to load em up and check again.

 

[laatsch55]

One disadvantage to having wire to snug in the hole. This is soldered well on the other side. I will not solder this side till I can see if I can repeat the squiggly waveform from the other day.

 

[laatsch55]

Loaded it is there from 23KHZ to 1KHZ, both channels. I will now check at R18.

 

[laatsch55]

It is present at both ends of R18, in both channels.

 

[Gepetto]

Yeah you are pushing that large hole to the limit Lee. You don't need large gauge wire for this connection, it is low current and prevents good reflow plus you may have a cold solder joint due to the size of the wire (thermal mass). I use 24AWG with teflon sleeving.

 

[laatsch55]

I know ya do Joe, was trying something was all. Now that I have duplicated the event I will solder this side to see if that effected the event.

 

[laatsch55]

Still present after soldering 11L, 11R.