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50-watter with Master Volume?
Posted: Sun Dec 31, 2006 11:20 am
by diofan56
Hi all!
I am considering having George build a 50-watt head with a master volume. It would also have a low volume and a high volume. A Plexi/JMP switch is also under serious consideration.
Do any of you have a MetroAmp 50-watt head with this setup? If so, how do you like it? How well does the master volume work?
Dave
diofan56
Posted: Sun Dec 31, 2006 1:58 pm
by novosibir
Have you lost your glasses?
Or why are your letters so big
Larry
Posted: Sun Dec 31, 2006 2:15 pm
by diofan56
I figured you old people need to have large text so you can see it! Ha ha ha!
Dave
diofan56
Posted: Sun Dec 31, 2006 6:31 pm
by Flames1950
diofan56 wrote:I figured you old people need to have large text so you can see it! Ha ha ha!
Dave
diofan56
Huh....how old are we supposed to be?
Posted: Sun Dec 31, 2006 8:23 pm
by diofan56
At least 40! I am older than that myself so I know all about that.
Dave
Posted: Sun Dec 31, 2006 10:19 pm
by Flames1950
Cool, then you don't need the big print for my sake.
What did you mean by a separate high and low volume, like the Mojave Coyote with a volume for the high frequencies and a volume for the low frequencies?
Posted: Tue Jan 02, 2007 9:29 am
by JimmyR
I don't know if it helps, but I have built a fair number of 50W MV amps based on the 2204 circuit but with various changes and they sound fab! I've used mostly George's parts and sozo caps, plexi-style trannies etc and always gotten a great sound. With a few tweaks the 2204 style circuit can sound amazing.
Posted: Tue Jan 02, 2007 10:30 am
by MacGaden
JimmyR wrote:I don't know if it helps, but I have built a fair number of 50W MV amps based on the 2204 circuit but with various changes and they sound fab! I've used mostly George's parts and sozo caps, plexi-style trannies etc and always gotten a great sound. With a few tweaks the 2204 style circuit can sound amazing.
Could you post some details ? I have 2104 2 X 12" combo I want to tweak..
Posted: Tue Jan 02, 2007 9:55 pm
by JimmyR
Well particularly for combos I like to change the PS caps from .022 to .1uF. Common mod. My theory is that they originally changed from .1 to .022 when they started using closed back cabs. I like the older value for the extra low-end oomph which helps a lot with open backed cabs.
The usual things like no bright cap on the vol pot, sometimes leaving out the bright cap on the mixers - although sometimes you do need it.
I also like to experiment with the cathodes on V1. I find that the .68/2K7 on the second cathode is a pretty important part of the Marshall sound, but I like to try bypass caps on the other triode with various resistor values.
The other thing I sometimes do is vary the value of the cap/resistor combo on the gain knob. I just changed my latest from 500pF to 250 with a 470K. Seemed to help with SC pickups.
So nothing very radical, just common sense mods. HTH!
Posted: Sun Jan 07, 2007 4:45 pm
by neikeel
I use a 72 spec 1987 with one of Georges PPIMVs - could not be happier (although Rockstah is quite persuasive with a slightly modified version by Fischer
Not tried it yet). It makes the amp very useable for gigs, rehearsals and home practice, I have recently found myself in a funk band too - I even use it for that with my strat (ok a bit embarrassing to admit but they are really good musicians
). I do run Mullard xf2s and Mullard pre.s which might help.
Sounds great with 4x12 (not so good with 2x12 but my 2x12 is not very good!!!).
When I have another 50watter up and running will try the other MV and report back but cannot bear to be without it so judge for yourself