MC2205 Love - Part 3

[emmvette]

Thanks for all the great work photographing your work on the MC2205; it is great documention, and you did an awesome job! I've read through and maybe missed something, but why did you end up replacing the large filter caps? I see earlier where you discuss and thought you would inspect and just leave put the old ones back. I'm facing this same decision of leaving my perfectly good looking originals intact, or putting in new, which I'm hesitating on because of the blue.

[Masterlu]

emmvette, Welcome to AA

[Gregory]

Originally Posted by emmvette

Thanks for all the great work photographing your work on the MC2205; it is great documention, and you did an awesome job! I've read through and maybe missed something, but why did you end up replacing the large filter caps? I see earlier where you discuss and thought you would inspect and just leave put the old ones back. I'm facing this same decision of leaving my perfectly good looking originals intact, or putting in new, which I'm hesitating on because of the blue.

Mc Service Dept. told me over the phone them leave the old ones in place unless there's signs of failure. The would be things like leaking, and the cans getting warm I'd suppose. If you look up in the discussion above a few posts, it was Ron C that convinced me to replace the PS caps. Terry said they could stay (I think.) The blue color isn't the greatest. Mc Parts will sell you a pair of black caps IIRC buy they are way more expensive. Still have the original silver MEPCO/ ELECTRA caps in the cabinet. Maybe get them tested by someone who has the right equipment someday.

Here's another tip.. look at the edges and ends of the heat sink fins. Do you see any pinpoint nicks or bare aluminum spots showing? You can dab these tiny spots with a Sharpie pen.

The 2205 still has some areas that need attention. Someday I'll put a new glass on it, and she'll be near-mint or mint.


-Gregory

[Gregory]

Originally Posted by kmanusa

My 2205 never seems to get hot at all. I do not use the walnut case, though.

I still have an intermittant left meter although mine just drops out entirely. When it does, cycling the speaker on/off switch always brings it back. I have replaced just about every cap and diode on the meter boards.

I have replaced all the output transistors and many signal path caps in both channels of the driver boards. I have replaced the input electrolytic caps (my amp is an older version w/o input board). Also replaced the main power supply electro caps. The amp works great but I never have solved the meter intermittant!

The amp in the series also has a left meter that is InOp when the AC power is turned on. Every week I think about fixing it, but the task seems to slip. The fix involves popping the meters housings open and deoxing the brass ring lugs at the end of the tiny black and red wires. Mc Service also recommends to solder the (tiny brass ring) terminals onto the wires. They were originally crimped on. Thing is, from all the handling, the ribbon cable has deteriorated!! Maybe that's what the delay is.


-Gregory

[Markd51]

Very nice thread Gregory, I enjoyed the read, and your pics. Thank you!

I would assume the smaller MC-2105 is similar in many ways to the 2205 Amp.

I see Terry D. has chimed in thoughout this thread, so I'd like asking Terry here, if you commonly have done such with customer's units, a rebuild of the metter assemblies, blue lenses, and whatnot on the front of the Amp?

I'm of the thinking that basically all of these units for this time era are long overdue for the foam, and lens replacement-refurb. Thank you, Mark

[Perryinva]

I've sent 3 different pieces to him in the past (MR78, C28, and 1900) and my experience is that Terry will do as much work as you want to pay him to do! He's done it all, from just making it work to the works.