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Posts: 3314
Joined: June 29, 2000
Contributor
Since: May 7, 2004
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Hi Craig:
The A450 and A451 are identical in most respects... the largest difference btwn them is that the 450 does not have a 4 ohm tap on the secondary. The 451 has the "full" complement of secondary taps (4, 8, 16 ohms)--- and the way the secondary is wound is slightly different btwn the 450 and 451. But otherwise all of the main design considerations are the same--- i.e., the core size, number of turns, wire sizes, etc.
The 450 and 451 are nominally ~2200 ohms ct on the primary. The Mk. VI output is nominally ~1650 ohm ct. Reason is that the MK VI amp was designed for use with a quad set of 8417 tubes. The 450 and 451 was never used by Dyna captively in any of their in house produced amps... these transformers were designed for use with a quad set of KT88 or 6550's and were sold "over the counter" to support the DIY world.
Re: the US vs Japan MK VI's. The MK VI was only made for a few short years. The cost of shipping the complete MK VI to Japan was very high due principally to the weight of the transformers as well as the import duty in Japan for complete amplifiers. What Dyna did was to work with the importer and made an arrangement whereupon the MK VI's going to Japan would be sent sans transformers and that a Japanese domestic producer would build the outputs and powers (revised for 110 volt service) to original Dyna specs with Dynaco oversight on the project.
Unless you find a Japanese MK VI that has been sent back to the US--- all of the outputs, powers and chokes were made here in the good ole USA.
cheers,
MSL
Builder of MagneQuest™ & Peerless™ transformers since 1989
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RE: Dynaco OPTs - mqracing 09:46:59 10/06/09
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