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Messages - EddieTavares

#1
Tubes and Hybrids / Re: Peavey Mace Question ?
May 07, 2010, 09:57:07 AM
skynyrd

         I bought this amp in 2006, in the beginning I intended to replace the old ss preamp to all tube, but the solid state phase splitter make the amp much more louder tham a tube long tail pair specialy with that mods becouse became brighter. I compared with a Jcm800 side by side and my amp seems to be louder with more top-end and less mids.

        No problems with eletronics, heating, the power supply is ok, I ask a friend to mesure the bias and its all ok.
#2
Tubes and Hybrids / Re: Peavey Mace Question ?
March 25, 2010, 01:33:19 PM
Thank you J M Fahey, tudo na paz!


So if you use a cleam bosst it will increase the preamp distortion... remember it's a ss preamp... It'll distort in the second stage opamp (u5a), maybe some diodes in paralel to r42 will give you something like tubescreamer...

Something that I think now is increase the r100, it will increse the amount o signal to power amp!



Sorry one more time... this is the correct version of peavey mace:

http://www.abeltronics.co.uk/download.php?manu=peavey&file=peavey-mace-deuce-vt.pdf
#4
Tubes and Hybrids / Re: Peavey Mace Question ?
March 24, 2010, 09:52:46 AM
Hi, I'm brasiliam forgive my poor english

I bought years ago a cousin of your amp, a PV Classic VT that its circuit is almost the same of mace/deuce. My amp has just one tonestack and just 2 6l6 in the power section.

When I bougth the amp I tested it in the shop, the amp shows a lot of punch and bass frequences but not nuck mids and treebles enough and the tonestack seems didn't work at all... but it was

too cheap!!! Aproximately U$ 200.

I bought!

So I replaced all electrolitic caps, the smaller values I decided to use a bipolar electrolitic. This changes was not enough to becomes the amp brighter to my taste but becomes perfect to play jazz.

Some months reading manuals and schematics of Classic and deuce/mace in addiction other amps that have two tubes in the power section like bassmann and Hiwatt and schematics of solid states preamps, Too many hours trying different values of resisistors in different places... But just few and not complex mods made all difference, follow:

- I Added a presence control in phase splitter/power section. I made this With a 2x2 circuit board, 1 resistor, 1 trimpot and one cap, follow:


         22K    680N
   |---\/\/\/\/\--||--|
   | |   /\               |
   | |____|             |
   |                       |
   |     5k1             |
   |--/\/\/\/\/------|
   |                      |
   |                      |
  ---             fd back
   -

  This circuit must replace the IR24 (1k).

- I replaced the IR14 (1k) with 5k1 resistor.

- In the preamp section I replace R42 (33k) to 47k and R51 (33k) to 22k, this change makes the tonestack more effective.

All this changes make the amp more louder with mids and highs, Increased the distortion of power section, tonestack more effective ... perfect to rock'n'roll!!!