Henrik P

Pultec freq pops
« on: August 24, 2008, 05:47:20 AM »
Hi.

Does anyone know how to get rid of the pops when you switch frequencies on the G-Pultec?

Regards
Henrik


Tekay

Pultec freq pops
« Reply #1 on: August 24, 2008, 05:58:49 AM »
Use shorting switches, bleed resistors between the positions.
Thomas "TK" Kristiansson
----------------------------------
"The Sound Is In The Iron"
www.vintagedesign.se  www.tkaudio.se

Henrik P

Pultec freq pops
« Reply #2 on: August 24, 2008, 06:55:45 AM »
Thanks for the answer!
How many ohms should I use?

Tekay

Pultec freq pops
« Reply #3 on: August 24, 2008, 12:10:21 PM »
Neve uses 4M7 try that.Or higher.
Thomas "TK" Kristiansson
----------------------------------
"The Sound Is In The Iron"
www.vintagedesign.se  www.tkaudio.se

kazper

Pultec freq pops
« Reply #4 on: August 24, 2008, 12:15:38 PM »
Neve also uses 6.8M 1/2W why 1/2W I don't know you should be fine with 1/4W.

Kevin
Intentionally left blank

drpat

Pultec freq pops New
« Reply #5 on: August 25, 2008, 11:21:42 AM »
...
« Last Edit: September 18, 2010, 08:35:21 AM by drpat »
I use the LA2a on very hot signals like lead vocal.

ioaudio

Pultec freq pops
« Reply #6 on: August 25, 2008, 01:21:26 PM »
patrick,

can you confirm shorting switches in the original?

thanks,
-max

Henrik P

:(
« Reply #7 on: August 25, 2008, 02:26:10 PM »
Thanks for all the answers.
Its gonna be a pain to resolder all the switches :sad:

Here is what it looks like so far

drpat

Pultec freq pops New
« Reply #8 on: August 25, 2008, 11:33:26 PM »
...
« Last Edit: September 18, 2010, 08:35:37 AM by drpat »
I use the LA2a on very hot signals like lead vocal.

gyraf

Pultec freq pops
« Reply #9 on: August 26, 2008, 05:20:55 AM »
BUT - if you switch with signal running through, then it will thump - both on the original and the clone (as the filter is the same).

If you get thumping without any signal, then you have some DC in the circuit - which you shouldn't have, as this is a passive filter?? Check integrity of the input transformer and the grid-blocking capacitor to the tube amplifier.

Jakob E.
..note to self: don't let Harman run your company..


ioaudio

Pultec freq pops
« Reply #10 on: August 26, 2008, 09:10:07 AM »
thanks pat, thats interesting. i just talked to a local peq1a owner and asked him to check the switches, and he says they are non shorting/break before make.
i also tried both possibilities, and prefer non shorting clicks over shorting frequency jumps.

drpat

Pultec freq pops New
« Reply #11 on: August 27, 2008, 05:37:52 AM »
...
« Last Edit: September 18, 2010, 08:36:28 AM by drpat »
I use the LA2a on very hot signals like lead vocal.


 

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