|
Dynaco-Doctor Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
|
|
|
Dynaco-Doctor Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
|
In Reply to: RE: Was: Re: PAS Transformer Replacement posted by sbalfour on March 22, 2011 at 10:04:59:
For those searching these Dynaco Asylum archives for information, as I often do, the above post is incorrect.Per the original PAS manual, the Dynaco PAS used a #53 pilot lamp, NOT a #57. The data sheet for the #53 lamp indicates a current draw of 0.12 A, 60% less than the current draw stated incorrectly in the above post.
That means that the four (4) 12AX7s are drawing 300 mA, the 12X4 rectifier tube draws 300 mA, and the #53 lamp draws 120 mA, for a total of 720 mA, which is well within the speculated 1A filament ratings of the Dynaco PA-211 transformer.
Edit: Note that the 120 mA draw of the #53 lamp is based on its 14.4 volt rating. In the PAS testing done by Pacific Audio Regenesis (link below), the actual draw of the lamp, at the voltage the PAS runs it, is 90 mA.
"Replace the power lamp with an LED?
A common recommendation, propagated on online forums, is to replace the power lamp with an LED to reduce the load on the transformer. Keep in mind that the lamp was part of the intended load, is operating at well under its rated voltage, and only draws about 90mA.
And the transformer is already operating with a good temperature rise margin. Removing the lamp will only lower the core temperature by about 1.3
Edits: 04/07/22 04/07/22
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- For the archives - 1973shovel 04:51:07 04/07/22 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]