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A470 S Triode USA Ultralinear Output 35W/70W for Dynaco Replacement MADE IN USA

NEW A470-S, a reproduction of the Dynaco A470 output transformer as used on the Dynaco (tm) ST70 and MkIV amplifiers.

For the Dimensional diagram and hookup sheet for this unit please click here (Adobe Acrobat Reader required)

The primary is wound the same as the original A470, same number of turns, sections and wire size, using the same patented Dynaco winding method, and made on the same core size and material. Only improved insulation material used (thus making the transformer more resistant to abuse) and nice long (10 inch/ 25 cm minimum) teflon insulated leads have been added.




This transformer has what you'd expect out of a Dynaco transformer, like healthy low frequency inductance, high resistance to distortion caused by output tube imbalance, and low distortion overall. They're great for both hifi and guitar amplifier DIY projects (such as the Eiclone project at www.diytube.com ) as well as replacements for Dynacos.

This type of transformer can be used with many tube types, such as 6550, KT88, KT90, 6CA7/EL34, 300B, 2A3, 6B4 or push-pull parallel 6BQ5/EL84 & 6V6-GT. It may be used with triode, pentode, or ultralinear (screen tap connection) wired tube arrangements.

Brand new production, MADE IN USA.

Transformer specs are: 4300 ohms CT primary with screen taps, 4,8 and 16 ohm secondary. 20 Hz to 20 KHz response at 35W, within 1 db, 30 to 15 KHz at 70 watts. Max DC per side (suggested) 80 ma. Exact same dimensions as the original A470 Dynaco transformer: Height 3 1/2 inches (88 mm) Width 3 inches (75 mm), depth over covers 4 inches (101 mm), mounting centers are 2 5/16 inches (59 mm) by 2 7/8 inches (72.5 mm).


Sunn Replacement Part# 3-4OT


a470s$124.95

A470 END BELL REPLACEMENT COVER a470endbell$13.95


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