Tubes Asylum

Questions about tubes and gear that glows. FAQ

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

Will this work? Switching from 6.3 to 12.6 volts

Posted by DAK on June 11, 2017 at 16:52:21:
I was looking for some 6x4 rectifier for my eico st84 preamp which i just finished rebuilding. I found that i have quite a few 12x4 but no 6x4. the eico uses 6.3vac heater voltage. So, i wondered if i did a voltage doubler circuit with the 6.3 and appropriate rectifiers and caps if the resultant DC voltage would be adequate for the 5 12ax7 tubes and a 12x4 rectifier. I would have to rewire the sockets for 12 volts.
I know a lot of you are thinking 6x4 tubes are pretty cheap why go through all the trouble? As a matter of fact i am going to get some but still i wonder for argument's sake if this is a valid thing to do? In case i have a situation where i needed the lower noise of DC heating of the preamp tubes. Cheers, Dak