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MC75 Cages

BuzzK

BuzzK

AK Member
Subscriber
I've got a pair of MC75s that I'm restoring. They were made for some kind of industrial application - the input potentiometer wasn't wired to spec, and there was no knob.

Anyway, I'm having a bit of trouble finding cages for the units.

I have a great metal fab shop that can reproduce the originals. I have a couple of questions:

1. Will cages from other models fit an MC75?

2. Might there be enough demand from other owners to do a run of 10 - 20 pieces (in order to reduce costs)?

Thanks in advance . . .
 
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Hello Buzzk

1. Will cages from other models fit an MC75 ? no , each cage is made for each model , a MC75 cage fit only MC75 and will fit no other.

2. Might there be enough demand from other owners to do a run of 10 - 20 pieces (in order to reduce costs) ? you can produce them if you want but there is a seller on the bay who offer MC275 cage and he didnot sale a lot of them
Producing 20 pieces is like a gamble , you can winn,or loose .
 
clinic-audio said:
Hello Buzzk
you can produce them if you want but there is a seller on the bay who offer MC275 cage and he did not sale a lot of them
Producing 20 pieces is like a gamble , you can winn,or loose .
Click to expand...

Thanks for your reply.

I would sell them for a lot less. :-)
 
Pio1980 said:
Are you going to do a thread on this resto? I am interested in seeing this version.
Click to expand...

I certainly could. However, I didn't document the "before" conditions.

I restuffed the larger cans and replaced the pair for the voltage doubler. I also isolated the ground connection from the input jack from ground with a 10 ohm resistor, to reduce noise (hum). I replaced the A/C jack with an illuminated power switch, which I think is a must (if you are not a purist, which I am [usually] not . . . )

MC75 mod.jpg
 
Thnx, I've been on the lookout for industrial Mac as a more affordable alternative to the "collectables" and am interested in the variations.
 
I used a KCD1-106N Mini Rocker with lamp10A.
125 VAC 3 pin SPST ON-OFF Boat Rocker Switch
 
Makes you wonder if they were an option. Very few have them now. I know people pass on and estates are sold on but I figure most original buyers would have stored the cages in the original shipping boxes. They should have turned up and sold with the amps. Makes you wonder how so many were lost.

BillWojo
 
Sorry , but this is not what I expected for a repro
the grids is not the same , emblem on the side (original don't have emblem on the side)
gold emblem (what for ? )
square holes and not round
and price too expensive in my point of view
If you have a pair of mono blocks this will cost you 440,00 usd + shipping :yikes:
 
clinic-audio said:
Sorry , but this is not what I expected for a repro
the grids is not the same , emblem on the side (original don't have emblem on the side)
gold emblem (what for ? )
square holes and not round
and price too expensive in my point of view
If you have a pair of mono blocks this will cost you 440,00 usd + shipping :yikes:
Click to expand...

I've never seen a MC75 cage so I don't know what spec is.
It's a rare bird. If you found a pair of originals, they would not be cheap, but I agree $440 is steep.
 
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Well, these aren't Verdin amps . . . probably coal table shakers!

I'm a bit confused about the cages. There is one on eBay that is listed as genuine & "unobtanium" and has round holes – for $325+. Another (in bad shape -- with corrosion damage) is listed for $90, but the seller has a pretty low rating. And the repros have square holes . . .

Wish I could find one to "borrow" in order to copy it . . . I'd buy the $90 for a sample if I had any confidence in the seller.
 
While not a definitive answer on the shape of the holes, I looked at other Mc power amps. The MC240 Mid (1961-65), MC275 (1961-70), and the MC75 (1961-70) all had small square holes. The first to have small round holes was the MC240 Late (1965-69).

The MC40 was produced from 1962-69 and so likely had the small square holes. On the other hand, the factory may have switched over to small round holes in 1965 when the MC240 Late started using these.

Larry
 
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