Unless you are a collector, you will pay more for a vintage 275 than a used Mk-IV or Mk-V (the two latest models) and you will not get as good sounding an amp for your money as the two latest models. The IV and V are identical in that they both have:
1. Detachable power cords
2. 490V power transformers (420V in previous models)
3. Balanced circuit topology and balanced inputs
4. Lo-maintenance polished stainless steel chassis
5. Tube-cooling chimneys
6. 90W/ch output (75W/ch in previous models)
7. 180W mono (150W previous models)
8. Sturdy powder-coated tube cage and transformer cans
9. Lo noise short trace main board (better than point/point IMO)
10, Improved quality pcb components (resistors, caps, diodes.)
The difference(s) between the IV and the V are:
1. The Model V contains NO LEAD (RoHS for marketing in the EU)
2. The V has modern 5-way speaker binding posts; the IV has barrier strips.
3. The V has no input attenuators for single ended input operation.
There is no sonic difference as far as anyone can tell.
I don't know if it's easy/possible to convert the operating voltage -- contact the factory.
A fully restored, reliable, mint pair of used MC75's will cost you upwards of $6000. You could by a pair of lightly used mint MC275 IV's or V's for $5000 and run them mono @ 180W/ channel instead of 75W/channel with a pair of MC75's (which BTW you could not run with balanced interconnects!) So why would you want MC75's, unless of course you have decided to collect vintage amps?
1. Detachable power cords
2. 490V power transformers (420V in previous models)
3. Balanced circuit topology and balanced inputs
4. Lo-maintenance polished stainless steel chassis
5. Tube-cooling chimneys
6. 90W/ch output (75W/ch in previous models)
7. 180W mono (150W previous models)
8. Sturdy powder-coated tube cage and transformer cans
9. Lo noise short trace main board (better than point/point IMO)
10, Improved quality pcb components (resistors, caps, diodes.)
The difference(s) between the IV and the V are:
1. The Model V contains NO LEAD (RoHS for marketing in the EU)
2. The V has modern 5-way speaker binding posts; the IV has barrier strips.
3. The V has no input attenuators for single ended input operation.
There is no sonic difference as far as anyone can tell.
I don't know if it's easy/possible to convert the operating voltage -- contact the factory.
A fully restored, reliable, mint pair of used MC75's will cost you upwards of $6000. You could by a pair of lightly used mint MC275 IV's or V's for $5000 and run them mono @ 180W/ channel instead of 75W/channel with a pair of MC75's (which BTW you could not run with balanced interconnects!) So why would you want MC75's, unless of course you have decided to collect vintage amps?