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Joe Good to know I did some test w shorter ones and did not see a different. I was also thing if it was a problem adding shielded cables. what do you think?

The Goal is to have a test fixture since I'm doing a bunch of them, I have a lot of parts so I'm going to update all the old PL boards w news parts and Resistors and them I can swap out them w the new PL14_20G1 This PL 400II has already had 2-PL14_20G1 boards in it and the Original modify PL one.

Here the pic of the Connecters I added and is wired w 20awg but it tight (not a lot of room behind the board. I will make the Bias wires longer from the board so they can move around the board, I'm using 4-connecters all wired from the backplane and power and all are wired for the PL14_20G1 . I...

Oh OK , I see that you took the 7.5K Resistors out? bottom pic and I see a blob of solder by the Cap (Top Right ) I can look later at my working board , but its full comp. the Zennor diode has been replaced & I would add sockets for the op-amp , I had a lot of problems w the Pots so I would...

What's you Plan? No wires?

That's a nice Unit, How many bad outputs just that one? Do you have a pic of the board front and back?

Kits are cheaper now, not a bad ideal (sometimes a shot gun approach is just quicker) are the outputs good I cant find your thread w the Pic of the Board I remember some bad traces? do you have the Link?

Have you had time to work on it yet? The Boards also use Op-Amps

As these get older, new problems will pop up and every little tip Helps :p

So you think this is high frequency oscillations? I need to test my other 700II and see if it also does it, as I recall I think they all did it? but I not sure since it been 20 years ago. I will have to test the 400II w my original board and my PL14_20G1 #1 board ,using my #2 board What I...

Thanks I tried the straw so that's why it did not work and this is Good to know, this unit had no rust on the inside of one of the Bolt :) so for now I will leave it as is But I'm doing a bunch of other 400II , if a Have some bad ones or a little more time and they have a lot of rust I will do...

Gene and George I pulled one bolt out and I would have to drill hole's in both transformer covers and it still might not work? So its a no go for me , yours might have bigger holes. So for me I don't want to take the change of loosing up anything in the inside the transformer (metal and...

w the volume turned up? You should be able to make it Dances

When your done, Buss out the each bolt to Ground and check and make that it is open (when I do mine I will only do one bolt at a time I don't want to to open any of the steal shanks) I also might use a brush to get the rust out I hope theirs is none LOL . also George said to use Stainless Steal...

Sometimes testing can do that LOL

Not a option for the 700II cap to the 400II , their no room and I can buy the same value 15kUF for the 400II which will fit from Joe) I did use the old 700II Caps & than switched to the Newer 700II caps.

LOL I'm also taking it to the Extreme. And it sounds amazing until I hit the Tweeter rip sound lol Did you have the Tweeter rip sound? w all the room treatment and the speakers I made Dead, requires more Power. but has amazing sound stage and w the New board added even more Dynamic Range.

Thank George I'm running from the inside the wall are14awg than I run a 12AWG to a power strip (only 14awg) than the original PL cord don't think this is the problem since I normally have 2-PL 700II w no problems, except for power up and will trips the 15amd house breaker 1 of a 50 times (I...

Joe What is the Normal Transformer load regulation and running all the way up to Clipping. If the Voltage drops to much (high current) and will cause problems to the transformer? or other components? (I use fans and always keep it below 110 degrees) Transformer seems to be a normal temp but I...

Joe That's what I thought, I did not notices any real gain differents. I also have been experimenting w different Capacitors (have the 700II in their now, I bought from you) when the power Rails + - DC go down from 80vdc and around 74vdc or below I can get a Bad Spike in the tweeter. What's...