Any way to reduce noise on those Meek VC6?

jeronimo · 18th December 2004

Hello guys, I have a Joe Meek VC6 that I want to try to make it sound quieter... ´cause this thing IS noisy.
Any IC´s or anything that can be exchanged in order to make it sound better?

**Tim Farrant** · 24th December 2004

Is it just the mic pre that is noisy or the whole thing?

Pop the lid and see what opamps are in there, especially around mic preamp stage. The OP275 from Analog Devices is a safe replacement for any TL072's in the audio path, but might not work correctly in other situations like the compressor sidechain detection circuit.

Hope this is of some help
Tim.

jeronimo · 24th December 2004

Nice idea. I´ll rip it apart and post some pics here... what do you think?

jeronimo · 21st April 2006

Ok, here´s the thing:
The only chips I could identify inside the VC6 are those, 1 TL084CN on the pre amp and 3 LM324N on the compressor and the output (I´m guessing!!). Does this help?

tINY · 21st April 2006

Those are both pretty cheap op amps. Neither one is going to drive a balanced line.

I'm guessing that the LM324 gets used for filtering.

The TL084 is resonably quiet itself, but will only be good for about 60dB of gain. If you use all that gain, the S/N will be about 60-70dB.

What is the input impedance ot the unit?

-tINY

jeronimo · 22nd April 2006

I´ll check that and post back later... any ideas on mods for this unit?

Jim Williams · 25th April 2006

Low noise quads are not common, at least those that will do audio well. The obsolite BB4134PA is a good choice if you can find one, otherwise an Aries adaptor with the surface mount OPA4134UA should work. Alternatively, a LT1359CN is very good. You will need to check that all feedback resistances above 2~3k ohms have a small ~22pf cap across the feedback resistor. Local .1 uf psu decoupling caps are also needed.

Jim Williams
Audio Upgrades

18th December 2004	#1
jeronimo Lives for gear Joined: Jun 2002 Location: Montreal, QC Posts: 3,227 Thread Starter 1 Review written	Any way to reduce noise on those Meek VC6? Hello guys, I have a Joe Meek VC6 that I want to try to make it sound quieter... ´cause this thing IS noisy. Any IC´s or anything that can be exchanged in order to make it sound better? __________________ Think Diferente! http://www.jeracravo.com

24th December 2004	#2
Tim Farrant Moderator Joined: Jun 2002 Location: New Zealand Posts: 2,410	Is it just the mic pre that is noisy or the whole thing? Pop the lid and see what opamps are in there, especially around mic preamp stage. The OP275 from Analog Devices is a safe replacement for any TL072's in the audio path, but might not work correctly in other situations like the compressor sidechain detection circuit. Hope this is of some help Tim. __________________ "Come on, make my day" Dirty Harry (Clint Eastwood) Visit Buzz Audio

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21st April 2006	#4
jeronimo Lives for gear Joined: Jun 2002 Location: Montreal, QC Posts: 3,227 Thread Starter 1 Review written	Ok, here´s the thing: The only chips I could identify inside the VC6 are those, 1 TL084CN on the pre amp and 3 LM324N on the compressor and the output (I´m guessing!!). Does this help?

21st April 2006	#5
tINY Gear Guru Joined: Jul 2004 Location: Orygun Posts: 10,233	Those are both pretty cheap op amps. Neither one is going to drive a balanced line. I'm guessing that the LM324 gets used for filtering. The TL084 is resonably quiet itself, but will only be good for about 60dB of gain. If you use all that gain, the S/N will be about 60-70dB. What is the input impedance ot the unit? -tINY

22nd April 2006	#6
jeronimo Lives for gear Joined: Jun 2002 Location: Montreal, QC Posts: 3,227 Thread Starter 1 Review written	I´ll check that and post back later... any ideas on mods for this unit?

25th April 2006	#7
Jim Williams Voiding warranties Joined: Feb 2004 Location: beautiful Carlsbad, CA Posts: 10,070	Low noise quads are not common, at least those that will do audio well. The obsolite BB4134PA is a good choice if you can find one, otherwise an Aries adaptor with the surface mount OPA4134UA should work. Alternatively, a LT1359CN is very good. You will need to check that all feedback resistances above 2~3k ohms have a small ~22pf cap across the feedback resistor. Local .1 uf psu decoupling caps are also needed. Jim Williams Audio Upgrades