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When a bishop who has fallen into heresy is reconciled he is not reconsecrated. Therefore he did not lose the power which he had of conferring Orders. Furthermore, the power to ordain is greater than the power of Orders. But the power of Orders is not forfeited on account of heresy and the like. Neither therefore is the power to ordain. Further, as the one who baptizes exercises a merely outward ministry, so does one who ordains, while God works inwardly. But one who is cut off from the Church by no means loses the power to baptize. Neither therefore does he lose the power to ordain.
--St. Thomas Aquinas, Summa Theologica, Suppl. 38, 2.

Those ordained by schismatic bishops, who have been otherwise duly ordained, the due form having been observed, receive, indeed, ordination, but not jurisdiction.
--Pope Clement VIII, Instruction concerning the rites of the Italo-Greeks (1595), D1087.

Can. 2372. He who presumes to receive orders from one excommunicated or suspended or interdicted after a declaratory or condemnatory sentence, or from a notorious apostate, heretic, or schismatic, ipso facto contracts a suspension a divinis, reserved to the Apostolic See; however he who should be ordained in good faith by any of them lacks the exercise of the order so received until he shall be dispensed.
--Code of Canon Law (1917).
[Note: The implication is that such ordinations are valid.]

Every validly consecrated bishop, including heretical, schismatic, simonistic or excommunicated bishops, can validly dispense the Sacrament of Order, provided that he has the requisite intention, and follows the essential external rite (sent. cert.).
--Ludwig Ott, Fundamentals of Catholic Dogma (1955), p. 458.

Interesting comments which seem to fly in the face of this from the Second Council of Carthage:

“...therefore, according to the testimony of the Scriptures, and according to the decree of our colleagues, men of most holy memory, that all schismatics and heretics who are converted to the Church must be baptized; and moreover, that those who appeared to have been ordained must be received among lay people.”

Of course 2d. Carthage was a local council....

"When a bishop who has fallen into heresy is reconciled he is not reconsecrated. Therefore he did not lose the power which he had of conferring Orders...."

Thanks for that input, Petrosius.

Of course the Anglicans wouldn't fall into the category having lost valid orders.