Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time.

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Vintage Asylum ]

---

[ Alert Moderator ]

---

RE: George Wright AG1000 preamp power transformer spec

Posted by Eli Duttman (A) on November 2, 2014 at 10:58:25

In Reply to: George Wright AG1000 preamp power transformer spec posted by dls123 on November 2, 2014 at 10:27:57:

Don,

FWIW, the triodes in a 6GU7 are "the same" as those in a 12BH7. Pin out is the same as a 6FQ7 and, more often than not, 6FQ7 circuitry operates just fine with 6GU7s in the sockets. Perhaps thinking in terms of the 6FQ7 will allow for proper selection of the replacement power trafo. Also, the 70 ma. B+ current limit of the 6X4 is an important clue.

Can you post a quick sketch of the PSU? I'm curious as to how the late Mr. Wright obtained 2 rails from a single secondary, especially since 1.8 A. of heater current are drawn by the 3X signal tubes, but a 600 mA./"18" V. series heater string is possible.

Except for the signal tube heaters, a Hammond 261G6 might be suitable. Since the object of the exercise is restored functionality, perhaps an external regulated heater supply is the path of least resistance.


Eli D.

• Small Hammond Power Transformer Specifications   (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Schiit Audio

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---