mesa tremoverb tremolo mod

jeff · 09-05-2006, 02:58 PM

The amp uses a 555 timer base trem ckt. I would really like to get more depth out of the tremolo. I checked out the schem http://www.freeinfosociety.com/elect...iew.php?id=297
and the ckt is very simple. Any suggestions? Thanks

Mark Black · 09-08-2006, 06:20 PM

It looks like LDR21 is the controlling factor - you might research the part number they used and perhaps come up with a different LDR with lower "ON" resistance. Then again you don't want much lower "OFF" resistance or it will load the signal.

The 10K resistor in series with the Depth control might be another place to play around - maybe try another 10K across it (for 5K resultant) to give more drive to the LED in LDR21.

You might need to pay some attention to the specifications of the LDR and associated LFO circuitry to make sure you don't exceed current maximums...

Good luck!

AdmiralB · 11-25-2007, 01:05 AM

I realize this is an ancient thread, but I had the same problem. Replacing the weirdo trem LDR with a Vactrol VTL5C1 did the trick, lots more depth available.

09-05-2006, 02:58 PM	#1
jeff Junior Member Join Date: Aug 2006 Posts: 5	mesa tremoverb tremolo mod The amp uses a 555 timer base trem ckt. I would really like to get more depth out of the tremolo. I checked out the schem http://www.freeinfosociety.com/elect...iew.php?id=297 and the ckt is very simple. Any suggestions? Thanks

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09-08-2006, 06:20 PM	#2
Mark Black Senior Member Join Date: May 2006 Location: Near Seattle, WA, USA Posts: 341	It looks like LDR21 is the controlling factor - you might research the part number they used and perhaps come up with a different LDR with lower "ON" resistance. Then again you don't want much lower "OFF" resistance or it will load the signal. The 10K resistor in series with the Depth control might be another place to play around - maybe try another 10K across it (for 5K resultant) to give more drive to the LED in LDR21. You might need to pay some attention to the specifications of the LDR and associated LFO circuitry to make sure you don't exceed current maximums... Good luck!

11-25-2007, 01:05 AM	#3
AdmiralB Member Join Date: Jun 2006 Posts: 102	I realize this is an ancient thread, but I had the same problem. Replacing the weirdo trem LDR with a Vactrol VTL5C1 did the trick, lots more depth available.

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