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Either take the time to do it right, or find the time to do it twice. Apparently this time around I have selected the latter. I spent my 20's as a bench technician and a field service tech working on dynamometers. I was fairly good at troubleshooting at one point. That feels like a long time...

I'm using the sil-pads for all output transistors. I only used heat sink compound for the heat sink to chassis thermal transfer. Transistor to heat sink thermal transfer (and insulation) is via sil-pads. I actually took an hour to pull the boards out last night and I think I found my problem. I...

No, the trouble started when I tightened up the thermal straps on the bias transistors and cranked the backplane board down one last time. Then I added in the second row of transistors and had the runaway bias issue. The 4 to 8 fin conversion was just a joke. All I did was mount in the small...

Only thing I can think to do is keep hitting the rewind button. Taking out all three boards this morning. Perform a thorough inspection of all solder joints and wiring. Something broke free. Hopefully I'll find something and then begin the startup procedure from step 1.

No, White Oak backplanes.

One more thing I did was tighten down the thermal straps on the bias transistors. I was expecting to never lift the control board again. Just checked for shorts across any of those leads or to ground. Looks okay.

B+ is at 1.2v and bias is 0.6v already.

It's as if bias = half of B+ now.

Only other things I did between good and not good was Install the clamping plate over the bulk caps and added a few tie wraps.

2nd row out and same result. Bias jumped up to 1.3vdc before I could even reach 10vac input power.

Hmmm... It appears that I may have spoke too soon on getting her up and running this weekend. That was back when I wasn't anticipating any problems. I brought it up with the control board wired in and the bottom row of output transistors installed. It came up fine. I was able to adjust the bias...

My Rotel Phono pre arrived already! Color me impressed. That was the fastest eBay purchase->delivery I've ever seen. I'm going to Tulum next weekend, so it'll have to go on the pile for a few weeks before I tear into it.

I saw that! Those must be some REALLY nice bolts. Maybe he meant 147 Dominican pesos?

Back to the WOPL400... I powered on last night with the bottom row installed. Everything came up fine. Voltages look good. I am getting 5.85v on my light board supply feeds. I'm not exactly sure how with this series 2 transformer, but it looks like I'm good to go for my White Oak analog VU...

I still had the instruction set - see attached.

I bought everything on the BillD bill of materials. Replaced power supply and signal path caps, resistors, and op-amps. Didn't change the sonic holography design, kept it fairly close to original values, just increased voltage ratings.

I just picked up the Schitt Mani 2 that VSAT recommended and I have heard good things about. I also now have this Rotel on the way. I'll hook both up to the RL-11 and see which one I like better.

Lol, you guys are bad influences. I just bought the Rotel too. I'll do a A/B and sell/return whichever one loses the head-to-head. Sniff - do you have that Phono Guru upgrade instruction set handy? I just did a quick search and didn't immediately find it, so naturally I gave up.

From their site: "Mani 2 is simply the highest-performance affordable phono preamp, period." Sold. It's on the way. Thanks for the suggestion! I was leaning towards the Pro-ject Phono Box S2 to pair with my Pro-ject Debut Carbon with Ortofon Blue cart, but I'll give this Mani 2 a try...

Lee - this might be a question for another thread on another day, but I intend to play 50% vinyl and 50% hi-res streaming on these through my BlueSound Node 2i. What upgrades can you suggest in the phono stage on the 3300? I would like to order the recommended parts and get that work in the...