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To hell with that White Oak snake oil! All you need are sockets for the IC's and new ICs for your sockets. Thought you all might want to properly invest your money...

Ah, I see! Looked up a couple pics of the series 1, and wouldn't you know it, one explicitly states 4 channel SQ + Logic, and the other ambience.

Hydroponics, but I like where your head is at!

I'm slowly but surely beginning to understand what's happening. Do I need to coordinate the (2-2-4), (4-2-4), etc. media with the pre-amp? Which formats do our PL's decode? Does this happen over all of the inputs? It makes me wonder if I can find a digital copy of older quadraphonic music and...

From what I've been reading, the media is encoded and then decoded in the pre-amp (similar to AM or FM radio) before being sent out. That being said, I see that most people talk about LP when talking about quadraphonics, but that can't be the only format. Does the demodulation happen over all of...

Alright guys, please excuse my ignorance, but I am having trouble wrapping my head around this. How do media devices achieve quad channel operation through a stereo input? I'd love to take advantage of my 2000 or 4000's abilities even if it doesn't end up being a long term setup.

Thanks again for answering my novice questions. I'm going to dig into it more and report back

Thank you all for the insight! WOPL just for clarification, you use the RC4136's to replace the original 4136's and not the 4739's correct? Are the pin configurations the same?

I restored my dad's original 2000 II with the BD 4136 adapter and OPA2134's fitted along with new muse caps and it sounds fantastic!! I left the 4739 alone since there was nothing viable at the time. FF to now, I have a 4000 II I bought with one dead channel that I'm tracing down to possibly a...

So the 400 sounded fantastic after the WO parts installed when connected to the front end of my ADCOM setup. I then put the 400 back in its place with the 2000 and I notice a low hum coming from the 2000. It gets louder if I just touch a fingertip to any of the buttons on the front and gets...

Did you end up making a decision on these? I picked up a pair for cheap a few months back with blown tweeters.

Well that certainly explains it!

Is it normal for Q1 to get hot at idle? Q2 was warn, but nowhere near as hot. I noticed while waiting for it to warm up for bias adjustment.

I really need to learn to pay attention to directions. I wired up the driver board wrong on both channels having 2 leads on each side off by one pin, and I blew a rail fuse. Wired everything up correctly, replaced fuse, and bias was able to be set at 380mV on both channels! DC offset is still...

Well, everything is installed. By everything I mean WO Cap kit, driver board, and output transistors. My emitter resistors were already .33ohm, so no worries there. I'm trying to adjust the bias and on both channels, I only have a range from 3.5mV to 18mV on both channels. I made sure to turn...

So I bought 4 of those 410's linked earlier just to take advantage of the opportunity and the price wasn't going to break the bank. From what I can tell, they are new, and they are legit unless someone more experienced can prove otherwise...

That seemed like it was the Mouser number. Those are the pre-cut ones right?

Well, that's good to know. Does anybody have some stock they'd be willing to part with? And does anybody know what you call the rubber pads you put under the transistors?

Ok great! Thanks for the info. Now about the drivers, the notes say to use the RCA410 or SJ2741 which are both obsolete. I currently have the 410's in there now which I believe are original. I have read people say that you can use the same device as the upper rows, but the fact that the notes...

The release notes for the Rev. E driver board say to change all your transistors (for quasi) to MJ21196. After looking those up, I see they are obsoleted. Mouser has the MJ21196G and I'm curious if these will be sufficient. Here is the data...