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I just finished up a vintage studio monitor restoration. A hell of a lot of work but I think it was worth it. Here are some before and after pictures. I`ve documented the process in more detail over at Lansing Heritage if anyone one is interested...

I noticed that too. Frankensteined?

Nah, that`ll buff right out :)

Ouch :sad1: http://www.ebay.com/itm/Vintage-Phase-Linear-700-RMS-Power-Amplifier-Amp-Exct-/201160242147?pt=Vintage_Electronics_R2&hash=item2ed615b3e3...

You should`nt have any problems at all. You will find that a new fan is much quieter. You can experiment with the additional series resistor too but make sure the amp tolerates the PR heat and humidity. The system I was referring to earlier consisted of 16x 750B/C`s that were driven hard and...

Oh I have. I used to run a BGW powered Turbosound rig and they all were modified in that fashion and never experienced any amp failure . It made cleaning the amps so much easier, 6 screws and a quick brushing, you were back in business in less than 5 minutes. That also kept things very clean on...

You`re very welcome. If you want to see what your amp can really do, go ahead and do the cap change. It`s $10 well spent, the difference is quite noticeable :)

Panel removal and disassembly was key (and a huge PITA) in this case. Galvanic corrosion had set in between the panel and hex fasteners so a few drops of PB Blaster were needed to break them free. The knob had to go too because the set screw was cross threaded so it and the pot were...

I had chance to put the amp into the system today ( Arcam CD-82T>Simaudio Moon i-3>BGW 750B>Spendor S8e) and I`m glad to report that it`s sounding every bit as good as it`s looking :happy7: It`s a smooth and ballsy sounding amp. It doesn't have the low end torque or control of the 700B which...

Those amps are set up so that they intake from the rear and exhaust through the vents on the left and right topside. It seems the exhaust would be a little constricted in that rack. I`m currently working on a 750B (see link) and installed a new fan in reverse fashion...

Looks good but can it breathe properly?

American Muscle In good company :smokin:

Who said you cant polish a turd? Phase 1 is completed! The amp was fully assembled a few days ago except for the volume knobs which arrived from China this morning. The original knobs were most likely custom made so finding a suitable replacement turned out to be quite the task. I found these...

The power supply went in after the faceplate and handle assembly, damn that transformer is heavy! Relay and meter boards were next up. I left the fan till last in order to install the 47uF/100v Vishay bypass caps.

Nothing special really, I just didn't want to enlarge the holes to accommodate a new jack.

Yes but reluctantly. The input attenuators were barely conducting as were the phono input jacks. They were so dirty that they would only conduct at certain positions. The new pots would take care of one issue but then there were the input jacks that needed to be dealt with. After much cleaning...

Moving right along. Now that the cleaned and painted panels have had a chance to dry, it`s reassembly time. Everything will go back together more or less in reverse order except for the front panel and handle assembly which will be sooo much easier when the chassis completely gutted. Backside...

The Coke can does provide a reference. Caps are 21 000 uF @ 85vdc, transformer isn't too shabby either 55-0-55 and 12 v secondary's, not sure about VA.

You mean like this? The chassis components, main housing, faceplate, handles, top cover and transformer shield were scrubbed down (yuck:pukeleft:), degreased, lightly sanded, masked off and painted. This amp was subjected to a fair amount of dampness/humidity or had ingested some form of liquid...

The later production units had much neater wiring harnesses. I removed the entire assembly as a whole and gave it a careful scrubbing using 99 percent Isopropyl alcohol. It turned out pretty good but I think a second go may get it a little better. Transformer leads received a similar...