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: triode wired KT88

Posted by tube wrangler on June 24, 2017 at 10:56:52:
Listen to TRE.
Think of it this way-- a PP circuit is a processor-- it forces
reduction of signals and distortions found in the Common Mode--
including musical artifacts that are in the common mode (not all parts of music are). Since most of audio here in the States uses 60 HZ A.C. power,
PP and/or balanced circuitry is commonly used to PARTIALLY SHORT OUT
A.C. interference that is Common to both sides of a signal--
hence, the "Common Mode" moniker. Of course, some artifacts
of music are also found in the Common Mode, so they also get reduced/processed by a PP and/or balanced circuit.
Single-Ended cannot do this. The only thing it can do is amplify
ALL of the signal, which includes both the negative and positive of it.
That is why S.E. sounds more real. It hasn't been processed.
S.E., of course, is much more expensive and harder to build right.
If you don't do a lot of exotic engineering and spend some real
money on S.E., you will prefer the easy to get extra bandwidth and power
with PP-- and that is why most users have PP amplifiers.
They're NOT getting ultimate musical expression with PP. What they
have is easy to get POWER and lots of EASY TO GET bandwidth.
Since Common-Mode reduction is inherent to PP topology, low hum
levels and low distortion measurements are EASY TO GET-- allowing
MUCH cheaper parts and engineering costs and MORE power.
S.E. has only one saving grace: it can actually reproduce music the
way it was recorded.
No PP amp has ever done that-- or ever will.
-Dennis-