DIY HiFi Forum

Welcome! Need support, you got it. Or share you ideas and experiences.

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

you're close

Posted by zarniwoop on February 15, 2005 at 15:44:48:
What I meant was that the splitter's grids are meant to be at +100VDC because they are originally direct coupled from the SRPP stage. Having them near ground would be okay except that the common cathode resistor is 15K (iirc). So you are running the splitter into cutoff because its not biased correctly.. not enough current. You could separate the cathode resistor into a large "tail" resistor and a small bias resistor and connect 1M grid resistors to the junction. Otherwise, to keep that 15K resitor like it is, you would need to connect it to a negative rail instead of gnd.
Other than that, I'm sure the foreplay has enough gain to drive the amp minus the front-end stage. And I probably wouldn't run DC out on ICs either (just make sure you know what you're connecting it to).
re heater current: sorry.. meaning: running other tubes that draw more heater current. 6n1p's, 6bl7's... etc.