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TS500 Tape Simulator / Testing The Unit For Correct VAC
« on: April 11, 2021, 11:38:19 PM »
Just a couple of questions to make sure my unit is working correctly:

1) I'm trying to check the VAC specified in "Testing your TS500" topic. In the first "Conditions" I set a 1kHz at .04VAC ? This is measured by attaching my DMM to the output XLR connector on my chasis?  Also, what do you mean by "in Bypass"?

2) Am I using TP2 and TP0 for testing the VAC for all the test conditions?



EQP501 Passive Equalizer / Question About R14 And R15
« on: March 08, 2021, 05:33:06 PM »
Hi JP,

I had initially made a mistake when building the SK25 which caused R14 and R15 to burn up. I replaced R14 and R15 and replaced the SK25. In a previous post I stated that I am getting a reading of .227VAC on TP2 when sending a 100Hz 2VAC signal. Could that reading of .227VAC be a result of the previous issue? Could I have affected other components besides R!4 and R15 due to the mistake I made with the SK25? If so, which components might have also been affected?

The mistake i made with the SK25 was reversing Q9 and Q10.


Rob Lanter

EQP501 Passive Equalizer / VAC and VDC Readings Not Right
« on: March 08, 2021, 01:16:01 AM »
Hi JP,

I have built two EQ501 units.

With unit 1 I am getting a reading of .227 VAC on TP2 when sending 2VAC 100hz signal, TP1 is ok at 1.3VAC

With unit 2 I am getting in the setup Step 4 DOA Check, I get  -.7 Millivolts on TP2. Is that ok?

Also with unit 2, in the "In case your EQP501 doesn't work as expectedI am getting some strange readings. When sending 2VAC 100hz signal I am getting .947VAC on TP2, not 1.15VAC. TP1 is ok at 1.3VAC on TP1.

What can the problem be?



Hi JP,

R14 and R15 started to burn up when I inserted the SK25 DOA during the testing phase after the build. All the voltages checked out before I inserted the DOA.

I sent you an email asking for replacement parts.



CP4500 Stereo Bus Compressor / Channel A Distorted
« on: February 06, 2021, 11:31:33 PM »
Hi JP,

I am getting distortion in channel A. I followed the tests in the "In case your CP4500 doesn't work as expectedI got some strange readings:

TP2: -.7 VDC
TP4: -1.1 VDC
TP11: -6.5 VDC
TP12: - 6.0 VDC

Step 6:
U6 pin 1: -.7

Any suggestions?


CP4500 Stereo Bus Compressor / How can I test the Side Chain HF Lift?
« on: January 31, 2021, 06:00:46 PM »
How can I test the Side Chain HF Lift?



CP4500 Stereo Bus Compressor / No Signal On 2nd Channel of the CP4500
« on: January 26, 2021, 10:46:53 PM »
I don't seem to be getting any signal on channel 2. Channel one seems to be working perfectly, but I do not get any readout on the DMM for channel 2.
What can I do to debug the problem.


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