At this time---
- Thread starter eSGEe
- Start date
Goldmember
Ambassador of Golden Yoo-Hoos
...and I'll piggy-back on that pure, undivided attention with something I like to watch while eating pancakes...nostalgic "brought to you by" clips!
Goldmember
Ambassador of Golden Yoo-Hoos
Perhaps eSGEe experienced an urgent restroom crisis whilst starting this groovy thread?
That, or he's outside shooting zombie killer iguanas that have invaded central Florida.
OP
eSGEe
Ferengi Ambassador of Trade
oh sorry --
just wanted to point out -- uhm
I HAVE A MESA!!!!!!!!!!!!!!!!!!!!!!!!! (review I stumbled on )
As title - I have a Mesa Boogie F30 I'd like to move on. It's a great great sounding amp, hands down the quietest operating valve amp with the least amount of background hum I've ever heard, has a set of the cryogenically frozen (or something like that) harma valves in it in full working order, and is brilliant for home recording. Clean it is bell like and chimey and has a nice spring reverb, but it can also bring the pain with a really great (very) high gain channel too. It's been gigged and has few small marks which I mention just for accuracy, but nothing significant - it has been looked after is in in good condition. Includes the proper Mesa footswitch and a cover of some sort (I think the cover is from a Riviera) Am asking for £400 for this, collected from Leicester, or £425 inc courier service (it is pretty heavy). Any questions please do ask. Specs and pics -
Handbuilt in the USA
30 Watts of Patented Dyna-Wat™t Power / 2xEL84, 4x12AX7
Fixed Bias for Consistent, Maintenance Free Performance
2 Fully Independent Channels, 3 Footswitchable Sounds (Channel 1, 2 & 2 w/Contour)
Independent Gain, Bass, Mid, Treble, Reverb & Master Controls per Channel
Pull Bright (Channel 1) Contour Switch (Channel 2)
Long Tank Spring Reverb
Parallel FX Loop w/Mix Control
Record / Headphone Output
Silent Record Mute Switch
3 Button Footswitch (Channel 1/2, Reverb & Contour)
V30 Speaker
just wanted to point out -- uhm
I HAVE A MESA!!!!!!!!!!!!!!!!!!!!!!!!! (review I stumbled on )
As title - I have a Mesa Boogie F30 I'd like to move on. It's a great great sounding amp, hands down the quietest operating valve amp with the least amount of background hum I've ever heard, has a set of the cryogenically frozen (or something like that) harma valves in it in full working order, and is brilliant for home recording. Clean it is bell like and chimey and has a nice spring reverb, but it can also bring the pain with a really great (very) high gain channel too. It's been gigged and has few small marks which I mention just for accuracy, but nothing significant - it has been looked after is in in good condition. Includes the proper Mesa footswitch and a cover of some sort (I think the cover is from a Riviera) Am asking for £400 for this, collected from Leicester, or £425 inc courier service (it is pretty heavy). Any questions please do ask. Specs and pics -
Handbuilt in the USA
30 Watts of Patented Dyna-Wat™t Power / 2xEL84, 4x12AX7
Fixed Bias for Consistent, Maintenance Free Performance
2 Fully Independent Channels, 3 Footswitchable Sounds (Channel 1, 2 & 2 w/Contour)
Independent Gain, Bass, Mid, Treble, Reverb & Master Controls per Channel
Pull Bright (Channel 1) Contour Switch (Channel 2)
Long Tank Spring Reverb
Parallel FX Loop w/Mix Control
Record / Headphone Output
Silent Record Mute Switch
3 Button Footswitch (Channel 1/2, Reverb & Contour)
V30 Speaker
OP
eSGEe
Ferengi Ambassador of Trade
AM I DEAD?!?!?!?!? --- you WASH YOUR MOUTH OUT WITH SOAP for that kinda slander and blaspheme!!!!
Sp8ctre
Ambassador of Steel
That punishment was imposed on me at least twice in my childhood...once for lying and once for cursing. Soap tastes terrible!
bea
AmBASSador of the F Clef
Cool little amp although i don't believe the 30 Watts from just 2 EL84. That's not possible unless You operate the tubes massively out of specs, especially out of the safety margins of those small sockets.
(You will need to run the tubes in nearly class B at anode voltages around 400 V instead of the permissible 300, and You'll possibly need to drive them into control grid current mode as well which is officially not supperted for these tubes)
But anyway, 15W clean (around 20W overdriven) is already pretty loud and quite often more than sufficient.
(You will need to run the tubes in nearly class B at anode voltages around 400 V instead of the permissible 300, and You'll possibly need to drive them into control grid current mode as well which is officially not supperted for these tubes)
But anyway, 15W clean (around 20W overdriven) is already pretty loud and quite often more than sufficient.
bea
AmBASSador of the F Clef
Well, of course i was curious. And what did i see? 399V on the anodes, 330V on the screens. Far beyond the specs. a bias of -11 V - not really cold, but cold enough that You don't need to make the bias adjustable (safety margin...). The output impedance of the PI possibly too large to be able to drive the tube into grid current.
Only 1 V drop through the primaries of the OT - that transformer must be pretty large...
Anyway, although this amp WILL definitely be more powerful than a typical EL84-PP-amp, i still won't believe real 30W; i would rather guess that they computed the RMS value of U(t)*I(t) on the output. This is suggested officially by the amareican stand commitees, but nevertheless it it physically meaningless (as the power my be computed by the average of that product, not its RMS value - RMS(U)*RMS(I)=average(U*I)!!!)
But that number is larger... my 12W amp appears as a 20W amp by doing this ;-)
(What i also see: the grid resistor i too large for fixed bias. But due to the large voltages currents in the tube will be relatievly small which seems to make this acceptable... it is also possible to drive the peak voltage on the anode beyond the absolite limit of 550 V - that's probably why most designers stick to slightly lower anode voltags - 340-370 V is not too uncommon)
And that design again shows that EL84 are actually pretty rugged tubes....
Only 1 V drop through the primaries of the OT - that transformer must be pretty large...
Anyway, although this amp WILL definitely be more powerful than a typical EL84-PP-amp, i still won't believe real 30W; i would rather guess that they computed the RMS value of U(t)*I(t) on the output. This is suggested officially by the amareican stand commitees, but nevertheless it it physically meaningless (as the power my be computed by the average of that product, not its RMS value - RMS(U)*RMS(I)=average(U*I)!!!)
But that number is larger... my 12W amp appears as a 20W amp by doing this ;-)
(What i also see: the grid resistor i too large for fixed bias. But due to the large voltages currents in the tube will be relatievly small which seems to make this acceptable... it is also possible to drive the peak voltage on the anode beyond the absolite limit of 550 V - that's probably why most designers stick to slightly lower anode voltags - 340-370 V is not too uncommon)
And that design again shows that EL84 are actually pretty rugged tubes....
OP
eSGEe
Ferengi Ambassador of Trade
Well-- I still dont know what it does how it does-- the attchment looks like squiggly lines and makes me want my hammer-- however---
Im guessing the 30 watts are based on the "30 Watts of Patented Dyna-Wat™t Power "
See it seems your not calculating the DYNA-Watts bea.....cant tell you how those are weighted/measured/biased/calculated or configured--- I do see according Mesa they ARE TM or Patented-- or uhm both I guess---(must be a well kept secret) perhaps they have hidden a FLUX capacitor in the wiring not shown on them squiggly line things?????
I dont know watt a DYNA-WATT is-- maybe its 2 regular watts? The mystery continues!!!
All I know is I turn the switch on and glorious tones flow from it----would be MORE beautiful if I could play worth a hoot -- but this amp is so good it at least make my ham handed hacking sound "tolerable"
Im guessing the 30 watts are based on the "30 Watts of Patented Dyna-Wat™t Power "
See it seems your not calculating the DYNA-Watts bea.....cant tell you how those are weighted/measured/biased/calculated or configured--- I do see according Mesa they ARE TM or Patented-- or uhm both I guess---(must be a well kept secret) perhaps they have hidden a FLUX capacitor in the wiring not shown on them squiggly line things?????
I dont know watt a DYNA-WATT is-- maybe its 2 regular watts? The mystery continues!!!
All I know is I turn the switch on and glorious tones flow from it----would be MORE beautiful if I could play worth a hoot -- but this amp is so good it at least make my ham handed hacking sound "tolerable"
According to the Mesa propaganda, the way they achieve 30 watts is through their “Dyna-Watt” technology. They acknowledge that the tubes, by themselves, would provide a maximum of 20 watts.
This link to one of their manuals (though not the F-30) talks a little bit about it:
http://mesaboogie.com/media/User Manuals/20-20 Manual.pdf
From perusing other areas on the Internet, the Dyna-Watt technology seems like a capacitive, power storing system that can provide instantaneous increases in power, though not necessarily sustained power increases.
This link to one of their manuals (though not the F-30) talks a little bit about it:
http://mesaboogie.com/media/User Manuals/20-20 Manual.pdf
From perusing other areas on the Internet, the Dyna-Watt technology seems like a capacitive, power storing system that can provide instantaneous increases in power, though not necessarily sustained power increases.