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Tube Tech CL 1B...any guru's here
Old 11th May 2006
Lives for gear
Kyle Ashley's Avatar

Tube Tech CL 1B...any guru's here

I have a CL 1B made in August 05. Tubes replaced with NOS Mullards. Setting up for a session tonight, I did a mic/level check and upon playback noticed a rattling/static sound behind the vocal.

Switched tubes out, somewhat less rattling sound, but still present. Patched mic pre direct, no rattling....tried other rattling.

Any CL 1B owners ever notice something like this?

Also, what is the function of the internal gain pot on the circuit board? Input gain?
Old 11th May 2006
Gear Head

I have two of them, one older, one a few months old, and never heard any rattling, and no engineer ever complained about it.

Old 11th May 2006
Gear Guru
rickrock305's Avatar

its funny, i have a CL1B and i swear i hear a little bit of distortion, very slight. So i changed out the tubes (mullards), and i'm pretty sure its gone. But my mind plays tricks with me. Its happened with several mics at two different studios, so it seems the CL1B is the weak link. As long as the gurus are going to be answering CL1B questions, i figured i would ask. What might cause this?
Old 11th May 2006
Lives for gear
Kyle Ashley's Avatar

I don't it's microphonics as I've now tried 3 sets of tubes.

I think I'll post 2 audio clips later and see if it's audible to anyone else. Thanks for the posts
Old 11th May 2006
Lives for gear
Kyle Ashley's Avatar

here are a couple of clips.

they're basic "test 1....2...." things.

the first one was through the CL1B. If you listen behind the voice you can hear the rattling/static issue.

the second clip is through the mic pre only...much cleaner.

anyone else hear this?
Attached Files

CL1B RATTLE.mp3 (49.0 KB, 207 views)

TEST NO COMP.mp3 (53.9 KB, 163 views)

Old 22nd June 2007
Lives for gear
Mike Jasper's Avatar
There are no Tube Tech gurus here. Try this link:

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