dbonin

EQP1A Standard Test Procedure
« on: January 21, 2021, 08:51:27 AM »
Is there a standard or recommended test procedure for a stock Pultec EQ?


Thanks!
Don
Stand off to the side of the unit, out of the line of fire.  Flip the ON switch...  "Watch for flames and sniff for smoke."


gyraf

Re: EQP1A Standard Test Procedure
« Reply #1 on: January 21, 2021, 10:21:49 AM »
No.

Can you explain what you are really looking for?

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

dbonin

Re: EQP1A Standard Test Procedure
« Reply #2 on: January 21, 2021, 11:03:37 AM »
I guess I'm just looking for a logical approach to testing my latest build, which is an EQP1A. 
My first pass is not to validate the wide range of EQ settings, but to check some baseline performance metrics.

Something like this?

Input  a .775 volt, 1khz sine wave (preferably @600ohms)

Measure the output under the following conditions:

  • Bypassed : output should be in the range of <value> volts with 1khz sine on output
  • With <knobs> in <some> position output should be <volts>
Stand off to the side of the unit, out of the line of fire.  Flip the ON switch...  "Watch for flames and sniff for smoke."

ruffrecords

Re: EQP1A Standard Test Procedure
« Reply #3 on: January 21, 2021, 04:59:11 PM »
I guess I'm just looking for a logical approach to testing my latest build, which is an EQP1A. 
My first pass is not to validate the wide range of EQ settings, but to check some baseline performance metrics.

Something like this?

Input  a .775 volt, 1khz sine wave (preferably @600ohms)

Measure the output under the following conditions:

  • Bypassed : output should be in the range of <value> volts with 1khz sine on output
  • With <knobs> in <some> position output should be <volts>

A basic first test should be done with the EQ bypassed as this should establish if there is any overall gain and the baseline frequency response. The engage the EQ and keep the controls in the flat position and measure the frequency response again. it should be pretty much the same. You could also measure the distortion at various levels and frequencies to make sure the gain make up amp is behaving.

Cheers

ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

EmRR

Re: EQP1A Standard Test Procedure
« Reply #4 on: January 21, 2021, 05:47:52 PM »
Yes, EQ flat to confirm amp response.  Somewhere here I posted all the curves from an Analog Allstars EQP1S5 I have, they seem to match the published Pultec curves in the manual.  Have a look at that. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

dbonin

Re: EQP1A Standard Test Procedure
« Reply #5 on: January 21, 2021, 10:04:25 PM »
Thanks Ian, Doug.
Stand off to the side of the unit, out of the line of fire.  Flip the ON switch...  "Watch for flames and sniff for smoke."


 

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