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So I put the newly WOPL`d 700 series II into the main system today and was quite pleasantly surprised at what I heard. This thing sounds real nice, gratifyingly detailed and smooth presentation with seemingly endless power and a killer bottom end, that aspect was kind of expected. I do however...

I dont have any 8 ampers around so I think I`ll leave well enough alone for now, I dont want to be blowing this thing up so soon! I just took some more measurements, line voltage compensated with the variac. The figures I got before were on a heavily taxed circuit hovering around 110v. With a...

OMG. What kind of rail fuses would support that kind of power,8 amps?

Will it be able to do 600wpc into 4 ohms?

Problem solved: I forgot to replace the 1 amp rail fuses following the control board and transistor installation and start up :rolleyes:.... Those tests were conducted with the DBT and variac in line. When bypassed, the initial rush current must have popped the right channel B+ fuse. Bias steady...

New control board installed (very nice btw). Backplane populated and all is good there, 0vdc offset both channels. Left channel bias rock solid at 350mv however, I cant get more than .050v on the right channel board regardless of trimpot position. Bias transistors were tested prior to being...

I had already successfully populated the backplane by the time I read your reply, I`ve since removed the B+ and B- wires that I ran to the right channel board. Please see the two attachments that were the source of my initial confusion. It is very likely an oversight on my end. Thanks for...

Stock, full comp backwall and E board. Thanks Lee.

I have conflicting information regarding the power supply routing to the two channels: Is B+ and B- only applied to the left side board 11L and 12Lor must B+ and B- be supplied to terminals 11r and 12r too? I ran the left side power with the 2 black and red wires previously on the PL36 board to...

I double checked everything and it`s good. Only the B- was labeled as un-fused but that has been since corrected.

As per your request Glen.

I`ve traced the wires that lead from the control board to the back planes; this is what I came up with going from left to right: Left Channel Black* B- fused White/Red * NPN column output transistor Base buss Red* Collector of bias transistor Blue*...

Thanks for that Grapplesaw:) Now the only difference is the White/Red wires that I have and White only wire on the drawing, everything else seems ok.

There seems to be a discrepancy between my control board and the manual. I have an extra wire (purple) on my board that doesn't correspond to what is on the manual. It`s right between the white/red striped wire and the input ground wires. That is the same on both Left and Right channels.

The 700 will be more specifically doing LFE duty. I have a few classic amps that I rotate in and out for that role, a BGW 750B, a Yamaha P2200, Peavey CS800 and the 700B I once owned. The 700B was the clear champion in that role, I`m hoping the 700 series II will re claim that title. My main...

I`m sure the E version will be just fine. It`s an evolved, tried and true board, it`s less expensive and I dont feel the need for a dual mono configuration particularly in my application which will be a single channel driving a JBL B380 subwoofer. Crosstalk is not really a concern.

Just placed an order for an assembled E board:)

Thanks Joe.You have mail.

Same design but dual mono? I guess channel separation and cross-talk figures are improved.

I think one of Joe`s boards is the safest and smartest option. What`s the difference between the E5 and G1 versions of the board?