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Odd Harman Kardon Output Transformers

97.105.99.138
Posted on May 26, 2017 at 12:59:38
Triode_Kingdom
Audiophile

Posts: 10049
Location: Central Texas
Joined: September 24, 2006
 Has anyone seen HK output transformers like these? They're supposedly for the A500, but every A500 and A50K I've seen used horizontal mount transformers recessed into the chassis. In addition to that, these transformers have the word "SPECIAL" stamped on the housing under the part number (FT3824638). That's the correct part number for the A500, but the stamping looks odd. It's much larger and more prominent than I've ever seen on HK transformers. Any ideas?

 

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RE: Odd Harman Kardon Output Transformers, posted on May 26, 2017 at 14:35:15
hennfarm
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Posts: 535
Location: Oregon
Joined: October 8, 2008
 Out of some old console possibly?

 

RE: Odd Harman Kardon Output Transformers (vertical), posted on May 27, 2017 at 07:56:56
Chip647
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Location: The South
Joined: December 24, 2012

Old post from Mike

 

That's the A700, not A500, posted on May 27, 2017 at 08:22:50
Triode_Kingdom
Audiophile

Posts: 10049
Location: Central Texas
Joined: September 24, 2006
 The A700 and nearly all other models did use vertical output transformers. So did their receivers. As far as I know, only the A500 and A260 (6L6GC) integrated amps were horizontal. Maybe hennfarm is right, these might be from a console or other variant. It seems odd that the factory wouldn't have used a different part number for a transformer that won't physically interchange. Anyway, I've never seen these before, was just hoping someone might be able to identify them.







 

Anyone know the primary of those OPTs? nt, posted on May 27, 2017 at 18:28:24
PeterI
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Posts: 1432
Location: Colorado
Joined: October 17, 2006
 nt

 

RE: Anyone know the primary of those OPTs? nt, posted on May 27, 2017 at 22:21:36
Triode_Kingdom
Audiophile

Posts: 10049
Location: Central Texas
Joined: September 24, 2006
 If they're really for an A500 variant with 7355 outputs, and if the factory didn't redesign them as part of the "SPECIAL" treatment, then they're about 3.8K plate-to-plate. That's the primary impedance of stock A500 OPTs.



 

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