Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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

RE: Bottlehead c4s w/standard RED LED's

Posted by deathtube 667 on July 22, 2021 at 03:14:21:
"The original HP LEDs have been out of production for many years. We currently use a version with identical performance specifications but a different format. The originals were chosen by the late John 'Buddha" Camille for their low noise and low dynamic impedance."

DT667 purchased the C4S manual years ago and DIY'ed C4S on perf boards with standard RED LED's.

The RED LED's were sourced from Mouser.

Of course, that does not say much for how those LED's performed vs. the HP units selected by JBC or those currently used by Bottlehead in their product line.

Perhaps all of this is meaningful to professional audio product engineers vs. typical hobby-level listeners.

DT667