| Author |
Message |
Tim Williams
Guest
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Tom Schlangen
Guest
|
 Posted:
Mon Dec 27, 2004 3:00 pm Post subject:
Re: Tube drag racing! |
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K3WL (or hot, at least for the plates).
Where is Nick Sheldon? Didn?t see him posting to RAT for
a long time now.
Tom
-- |
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shiva
Guest
|
| Posted:
Mon Dec 27, 2004 10:14 pm Post subject:
Re: Tube drag racing! |
|
|
"Tim Williams" <tmoranwms@charter.net> wrote in message
news:FdQzd.890$8S2.796@fe05.lga...
| Quote: | http://webpages.charter.net/dawill/tmoranwms/Elec_TubeChlng.html
What say ye?
Tim
|
Hiya, Tim.
First, where'd you learn nasty phrases like "Class D"? Been' hangin out
with those nasty SS audiophool boys, huh? Or was it the digital gang? I'm
so ashamed...
Anyhow, I think you have to tighten up the rules a bit to make the whole
thing interesting, otherwise the results will be meaningless. Lil' things
like the drive requirement - could i use SG drive? Or just tie the plate to
the AC mains & see how long it takes for my breakers to trip?
If the test time is not a part of the requirements, and a few cycles is
all i need (before the toob vaporizes itself), once again - i could get some
funky #'s. But that ain't draggin' - even a dragster has to finish the 1/4
mile before it's silly motor could be torn down. How 'bout making it 1
minute?
Since RF toobs will have an unfair advantage (low inter-element C - if you
get the rise & fall time down to nothing, and you have an ideal device (off
= [infinity sign]Ohms, on = 0 Ohms), and an ideal rise & fall time (0) on
the square wave, you simply don't have to dissipate *any* heat), so everyone
will jump on the class D (if that's even applicable, since you don't define
distortion limits - we could be calling it *anything*, like C, or even
AB1 - why not?).
Another bit which could make the whole thing more of a kick - let's agree
on some common, throw-away power toob, to make folk's results easier to
quantify & make it a bit less stressful on the wallet. 6L6, 6V6, EL34/84
come to mind. Folks usually have a bucketful of "pulls" they could play
with, and don't mind tossing into the trash after they "drag" them. I'd
pick the el84, to make it easy on the HV power supply. The biggest/baddest
i have is a homebrew 300 - 800V 1A, with sweep toobs as regulators, and
that's a monster. Can we stick with dinky toobs? Seem reasonable?
Also, since this is kind-o sort-a an audiophool NG, why not disallow
switching & tank (C oscillator) circuits, and nail down somethin' like 1KHz
sine as input / output, with something like 30% distortion (or clearly
visible clipping, or something - for the folks without distortion
analyzers).
I'd be up for something like that, only... You'll just show me a
circuitmaker simulation, right? <sad grin>
-dim, tormenting toobs since ... a long time ago.
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Tim Williams
Guest
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| Posted:
Tue Dec 28, 2004 2:01 am Post subject:
Re: Tube drag racing! |
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|
"shiva" <helpdesk@666.com> wrote in message
news:VpXzd.2610$PY6.1725@trndny02...
| Quote: | First, where'd you learn nasty phrases like "Class D"? Been' hangin out
with those nasty SS audiophool boys, huh? Or was it the digital gang?
I'm
so ashamed...
|
SMPS actually. Hey, it's not all bad! I've been using a 17CT3 for the high
voltage, high speed diode! ;)
| Quote: | Anyhow, I think you have to tighten up the rules a bit to make the
whole
thing interesting, otherwise the results will be meaningless. Lil' things
like the drive requirement - could i use SG drive?
|
However you want -- I'm just interested in output power.
| Quote: | Or just tie the plate to
the AC mains & see how long it takes for my breakers to trip?
|
That won't work because it's not performing any work. ;o)
| Quote: | If the test time is not a part of the requirements, and a few cycles is
all i need (before the toob vaporizes itself), once again - i could get
some
funky #'s. But that ain't draggin' - even a dragster has to finish the
1/4
mile before it's silly motor could be torn down. How 'bout making it 1
minute?
|
Long enough that you can prove that the tube has accomplished the power
level; if that takes a few seconds, fine. Most tubes (especially the small
ones) will have holes melted through long before a minute, anyway, so it
doesn't really scale.
And that's one of the advantages of pulsed operation - you kill the plate in
bursts so you aren't swapping tubes all the time or something. Heavy plates
will take a true *beating* before giving it up.
| Quote: | Since RF toobs will have an unfair advantage (low inter-element C - if
you
get the rise & fall time down to nothing, and you have an ideal device
(off
= [infinity sign]Ohms, on = 0 Ohms), and an ideal rise & fall time (0) on
the square wave, you simply don't have to dissipate *any* heat)
|
Huh?
I showed in my graphing example that heat is dissipated during saturation,
in the last example the tube goes between 200V, 800mA and 600V, 0mA.
Sweep tubes are in a whole other class as this goes. (Grading by heater
dissipation may prove a more accurate method.)
| Quote: | so everyone
will jump on the class D (if that's even applicable, since you don't
define
distortion limits - we could be calling it *anything*, like C, or even
AB1 - why not?).
|
Again... I just want to see how much power people can get from these things.
I don't care how, and it has no practical purpose so gimme the squarewaves
n' stuff. ;)
| Quote: | Another bit which could make the whole thing more of a kick - let's
agree
on some common, throw-away power toob, to make folk's results easier to
quantify & make it a bit less stressful on the wallet. 6L6, 6V6, EL34/84
come to mind.
|
I'll group it by type so this is no problem.
| Quote: | I'd pick the el84, to make it easy on the HV power supply.
|
Bah. I was thinking top caps. Sweeps with 7.7kV peak plate voltage
*rated*, I mean...geesh... that's what, 3kW output within ratings!?
| Quote: | The biggest/baddest
i have is a homebrew 300 - 800V 1A, with sweep toobs as regulators, and
that's a monster.
|
Sounds like a good torture chamber...
| Quote: | Can we stick with dinky toobs? Seem reasonable?
|
I'm gonna do a 12AU7 of course... I'd love to see the nuvistor class
results, if anyone wants to torture those relics!
| Quote: | Also, since this is kind-o sort-a an audiophool NG, why not disallow
switching & tank (C oscillator) circuits
|
'Cuz this isn't specifically for RAT, just anyone who wants to kill tubes.
:^)
| Quote: | and nail down somethin' like 1KHz
sine as input / output, with something like 30% distortion (or clearly
visible clipping, or something - for the folks without distortion
analyzers).
|
Everyone with a spec. anal. would then push the 30% limit definition,
because as the wave squares out, power goes up.
Pffbbt... hell! If I got a squarewave INPUT, and a squarewave output...
who's to say if it's distorted anyway!? ;-D
| Quote: | I'd be up for something like that, only... You'll just show me a
circuitmaker simulation, right? <sad grin
|
No, that'd be Gregg.
I on the other hand would bore you with text descriptions of math and
graphing. ;o)
| Quote: | -dim, tormenting toobs since ... a long time ago.
|
I figured you'd be a participant ;)
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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Gregg
Guest
|
| Posted:
Tue Dec 28, 2004 4:57 am Post subject:
Re: Tube drag racing! |
|
|
Behold, Tim Williams signalled from keyed 4-1000A filament:
| Quote: | I'd be up for something like that, only... You'll just show me a
circuitmaker simulation, right? <sad grin
No, that'd be Gregg.
|
:-)
Funny, I *am* simulating some pulse stuff for this.....
--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca |
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Tim Williams
Guest
|
| Posted:
Tue Dec 28, 2004 7:32 am Post subject:
Re: Tube drag racing! |
|
|
"Gregg" <nospam@unknown.org> wrote in message
news:Ij1Ad.33269$dv1.26192@edtnps89...
| Quote: | Funny, I *am* simulating some pulse stuff for this.....
|
I wonder how well the models hold up under high current. If you put 50V on
the grid and 800V on screen and plate, does it squash from saturating the
cathode, or is it basically unlimited? Does the saturation knee voltage
rise with current? (This I susupect will be the absolute limiting factor
for any particular tube.)
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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Gregg
Guest
|
| Posted:
Tue Dec 28, 2004 8:36 am Post subject:
Re: Tube drag racing! |
|
|
Behold, Tim Williams signalled from keyed 4-1000A filament:
| Quote: | "Gregg" <nospam@unknown.org> wrote in message
news:Ij1Ad.33269$dv1.26192@edtnps89...
Funny, I *am* simulating some pulse stuff for this.....
I wonder how well the models hold up under high current. If you put 50V
on the grid and 800V on screen and plate, does it squash from saturating
the cathode, or is it basically unlimited? Does the saturation knee
voltage rise with current? (This I susupect will be the absolute
limiting factor for any particular tube.)
Tim
|
From my experience, the models hold up well with DC parameters, it's the
AC params that are as reliable as a $2 watch. I don't even want to think
of the models pulse response.
My basic model plan is to make sure the initial DC params are good and
calculate component values for resonance.
Think of my "plan of attack" this way, you know those "penny shrinker"
devices that dump a few farads of cap through a little coil? Yeah, well
that with a smaller cap, 1% duty cycle (avg. power, 5W + headroom, say 15W
average on the tube) and a repetition rate of ~150KHz. I'll probably use
a compliamentary bipolar pair DC to the grid, +-50V split supply and vary
the drive stages "dynamic diode" for the tubes quiescent bias :-)
--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca |
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shiva
Guest
|
| Posted:
Tue Dec 28, 2004 11:50 pm Post subject:
Re: Tube drag racing! |
|
|
"Tim Williams" <tmoranwms@charter.net> wrote in message
news:_U_zd.2893$Bs2.2524@fe05.lga...
| Quote: | "shiva" <helpdesk@666.com> wrote in message
news:VpXzd.2610$PY6.1725@trndny02...
First, where'd you learn nasty phrases like "Class D"? Been' hangin out
with those nasty SS audiophool boys, huh? Or was it the digital gang?
I'm
so ashamed...
SMPS actually. Hey, it's not all bad! I've been using a 17CT3 for the
high
voltage, high speed diode! ;)
[doesn't even bother to look up the thing (but then the curiosity gets the |
best of him - he does - now can pretend to have known all along. As some
writer said 'bout writin' (loose paraphrase) "[writing] allows mediocre
minds, if they are diligent and patient enough, to seem relatively
intelligent." Hey, I'm all over that sh8t, especially since now one I don't
even need patience - the stacks are just a click away!)]
I ain't gonna ask why, though silicon made for *just that" litters the
streets, and is just a few boot-kicks away (forgive me, Dept. of
Sanitation - I'm not willin' to drag ageing monitors home for a couple o'
parts). Afterall, I use sweep toobs as voltage regulators...
| Quote: | Anyhow, I think you have to tighten up the rules a bit to make the
whole
thing interesting, otherwise the results will be meaningless. Lil'
things
like the drive requirement - could i use SG drive?
However you want -- I'm just interested in output power.
Or just tie the plate to
the AC mains & see how long it takes for my breakers to trip?
That won't work because it's not performing any work. ;o)
|
Ahh, so it has to perform work, huh? but it's OK if the drive power exceeds
the output power, right? Or is that out, too? [thinks of more Goldbergian
schemes] Modulatin' thyratrons (sp?)? Modulating *cathodes* (if input
power can be anything, why not? Mercury rects? All good with you?
| Quote: |
If the test time is not a part of the requirements, and a few cycles
is
all i need (before the toob vaporizes itself), once again - i could get
some
funky #'s. But that ain't draggin' - even a dragster has to finish the
1/4
mile before it's silly motor could be torn down. How 'bout making it 1
minute?
Long enough that you can prove that the tube has accomplished the power
level; if that takes a few seconds, fine. Most tubes (especially the
small
ones) will have holes melted through long before a minute, anyway, so it
doesn't really scale.
|
But Tim, that ain't interesting. I mean, I have respect for the
resourcefulness of old-time HAMs runin' a set of 6l6's in an oilbath &
water, and guessing the duty cycle (not of the waveform, but their keyin'
style, taking thermal inertia into account). Or drag mechanics building
hand-grenade motors which would *usually* last through a couple of runs
before goin "ca-boom!". Both tried to get the most from the least, but if
someone built a motor which would dyno wikid' -high numbers for a second,
and then melt down, i'd tell the guy to try voluntary lock-down wards... (
had the misfortune of dealing with a couple of 2-stage turbo,
oxygen-injected Merlin Diesels from an offshore - racer which did just
that.)
I still think that there shouuld be some defined test time /duty cycle
type o' a thing. Otherwise, I'll wait for you to post your results,
<machismo> and then blow them out of the water</machismo>.
| Quote: |
And that's one of the advantages of pulsed operation - you kill the plate
in
bursts so you aren't swapping tubes all the time or something. Heavy
plates
will take a true *beating* before giving it up.
Since RF toobs will have an unfair advantage (low inter-element C - if
you
get the rise & fall time down to nothing, and you have an ideal device
(off
= [infinity sign]Ohms, on = 0 Ohms), and an ideal rise & fall time (0)
on
the square wave, you simply don't have to dissipate *any* heat)
Huh?
|
You're missing the *ideal device* & device bein' *true* binary (0 rise &
fall times, 0 resistance when "on", infinite resistance when "off"). Think
it through, without beginnin' to plot anything, just Ohm's law:
when the *IDEAL DEVICE* is off, no power to dissipate, just like an open
microswitch wouldn't heat up, even when it's hooked up to the mains.
When the device is on, it's resistance is 0, thus a perfect conductor.
Let's not revisit Ohms'law.
This leaves us with the transition periods, where thhe device is neither
"on" or "off", but somewhere in between,
thus having *resistance*. That's when the device has to dissipate heat
(Ohm's law again). 'Puter folk are constantly tryin' to make faster
/smaller transistors to minimize this time, not only to allow for higher
clock speeds, but to minimize the heat which needs to be dissipated, and the
energy consumed (a laptop makes a lousy lap warmer). A real square wave,
unlike the ideal one, will have measurable rise & fall times, and, even if
the on/off states are close to ideal, the suckers still heat up. That's why
early overclocking was such a tricky deal - the proc will still do it's
thing, but heatsinking becomes critical, since the rise & fall times become
a significant part of the duty cycle.
I betcha' i still haven't made myself clear, but it's the [lack of]
coffee's fault not mine. Must go and get some. Hey, you want to clean up a
perl script for RDH mirrors? Drop me a line, Gregg knows my email.
-dim
| Quote: | I showed in my graphing example that heat is dissipated during saturation,
in the last example the tube goes between 200V, 800mA and 600V, 0mA.
Sweep tubes are in a whole other class as this goes. (Grading by heater
dissipation may prove a more accurate method.)
so everyone
will jump on the class D (if that's even applicable, since you don't
define
distortion limits - we could be calling it *anything*, like C, or even
AB1 - why not?).
Again... I just want to see how much power people can get from these
things.
I don't care how, and it has no practical purpose so gimme the squarewaves
n' stuff. ;)
Another bit which could make the whole thing more of a kick - let's
agree
on some common, throw-away power toob, to make folk's results easier to
quantify & make it a bit less stressful on the wallet. 6L6, 6V6,
EL34/84
come to mind.
I'll group it by type so this is no problem.
I'd pick the el84, to make it easy on the HV power supply.
Bah. I was thinking top caps. Sweeps with 7.7kV peak plate voltage
*rated*, I mean...geesh... that's what, 3kW output within ratings!?
The biggest/baddest
i have is a homebrew 300 - 800V 1A, with sweep toobs as regulators, and
that's a monster.
Sounds like a good torture chamber...
Can we stick with dinky toobs? Seem reasonable?
I'm gonna do a 12AU7 of course... I'd love to see the nuvistor class
results, if anyone wants to torture those relics!
Also, since this is kind-o sort-a an audiophool NG, why not disallow
switching & tank (C oscillator) circuits
'Cuz this isn't specifically for RAT, just anyone who wants to kill tubes.
:^)
and nail down somethin' like 1KHz
sine as input / output, with something like 30% distortion (or clearly
visible clipping, or something - for the folks without distortion
analyzers).
Everyone with a spec. anal. would then push the 30% limit definition,
because as the wave squares out, power goes up.
Pffbbt... hell! If I got a squarewave INPUT, and a squarewave output...
who's to say if it's distorted anyway!? ;-D
I'd be up for something like that, only... You'll just show me a
circuitmaker simulation, right? <sad grin
No, that'd be Gregg.
I on the other hand would bore you with text descriptions of math and
graphing. ;o)
-dim, tormenting toobs since ... a long time ago.
I figured you'd be a participant ;)
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms
|
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Tim Williams
Guest
|
| Posted:
Wed Dec 29, 2004 3:11 am Post subject:
Re: Tube drag racing! |
|
|
"shiva" <helpdesk@666.com> wrote in message
news:EVhAd.16156$vF5.14936@trndny07...
| Quote: | Ahh, so it has to perform work, huh? but it's OK if the drive power
exceeds
the output power, right?
|
Sure, although your grid will fuse first if it does...
| Quote: | Or is that out, too? [thinks of more Goldbergian
schemes] Modulatin' thyratrons (sp?)? Modulating *cathodes* (if input
power can be anything, why not? Mercury rects? All good with you?
|
Rectifiers do not amplify, so cannot participate. Thyratrons have control,
so if you can figure out a way to get controlled output power from them
(maybe PWM'd quasi-resonant something?), you can have a thyratron class.
Grounded grid has some of the input power fed directly to the output, so
that will have to be either subtracted, or counted as a different class.
| Quote: | But Tim, that ain't interesting.
|
So what, you want me to regulate it worse? Like how real drag racing can't
use pure nitro fuel because it explodes too much? Like how they can't
improve weight because of all the safety restrictions?
| Quote: | You're missing the *ideal device*
|
Tubes are *far* from ideal, Dim. :^)
| Quote: | I betcha' i still haven't made myself clear, but it's the [lack of]
coffee's fault not mine. Must go and get some.
|
Please do! :-p
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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Gregg
Guest
|
| Posted:
Wed Dec 29, 2004 4:33 am Post subject:
Re: Tube drag racing! |
|
|
Update:
I was right. I have a good pulse model and seems accurate enough for the
SS driver. The 6L6 model however, the plate model is disgustingly
inaccurate. The grid+cathode model looks accurate, 1.2 ampere pulse of
cathode current @ 66nS @ *40V, slight ringing, return negative spike, etc.
So, looks like I'll just have to breadboard without a spice plan (EEEEK!)
--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca |
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| Back to top |
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Guest
|
| Posted:
Thu Dec 30, 2004 6:04 am Post subject:
Re: Tube drag racing! |
|
|
Tom Schlangen wrote:
| Quote: | What say ye?
K3WL (or hot, at least for the plates).
Where is Nick Sheldon? Didn?t see him posting to RAT for
a long time now.
Tom
--
|
Hi Tom and fellow RATs!
I'm still out here in cyberspace, but need to be reindoctrinated with
all things thermionic, having been abducted and brainwashed by the
quintessential semiconductor conspiracy, and only recently come to my
senses. I need to see audio in a former light.
Being quasi-serious for a moment, it was the acquisition of a
handbuilt, MC Squared 3600W RMS semiconductor amp (0.01% dist at full
o/p) that led me to stray from the path. Numerous other similar amps
followed, until the total output seemed impossibly difficult to equal
with valves.
My only restorative strategy is to become a zealous proponent of
push-pull and abandon everything below about 400Hz!
BW to all
Nick Sheldon |
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Guest
|
| Posted:
Thu Dec 30, 2004 4:56 pm Post subject:
Re: Tube drag racing! |
|
|
shiva wrote:
| Quote: | "Tim Williams" <tmoranwms@charter.net> wrote in message
news:FdQzd.890$8S2.796@fe05.lga...
http://webpages.charter.net/dawill/tmoranwms/Elec_TubeChlng.html
What say ye?
Tim
Hiya, Tim.
First, where'd you learn nasty phrases like "Class D"? Been' hangin
out
with those nasty SS audiophool boys, huh? Or was it the digital
gang? I'm
so ashamed...
Anyhow, I think you have to tighten up the rules a bit to make the
whole
thing interesting, otherwise the results will be meaningless. Lil'
things
like the drive requirement - could i use SG drive? Or just tie the
plate to
the AC mains & see how long it takes for my breakers to trip?
If the test time is not a part of the requirements, and a few
cycles is
all i need (before the toob vaporizes itself), once again - i could
get some
funky #'s. But that ain't draggin' - even a dragster has to finish
the 1/4
mile before it's silly motor could be torn down. How 'bout making it
1
minute?
Since RF toobs will have an unfair advantage (low inter-element C -
if you
get the rise & fall time down to nothing, and you have an ideal
device (off
= [infinity sign]Ohms, on = 0 Ohms), and an ideal rise & fall time
(0) on
the square wave, you simply don't have to dissipate *any* heat), so
everyone
will jump on the class D (if that's even applicable, since you don't
define
distortion limits - we could be calling it *anything*, like C, or
even
AB1 - why not?).
Another bit which could make the whole thing more of a kick - let's
agree
on some common, throw-away power toob, to make folk's results easier
to
quantify & make it a bit less stressful on the wallet. 6L6, 6V6,
EL34/84
come to mind. Folks usually have a bucketful of "pulls" they could
play
with, and don't mind tossing into the trash after they "drag" them.
I'd
pick the el84, to make it easy on the HV power supply. The
biggest/baddest
i have is a homebrew 300 - 800V 1A, with sweep toobs as regulators,
and
that's a monster. Can we stick with dinky toobs? Seem reasonable?
Also, since this is kind-o sort-a an audiophool NG, why not
disallow
switching & tank (C oscillator) circuits, and nail down somethin'
like 1KHz
sine as input / output, with something like 30% distortion (or
clearly
visible clipping, or something - for the folks without distortion
analyzers).
I'd be up for something like that, only... You'll just show me a
circuitmaker simulation, right? <sad grin
-dim, tormenting toobs since ... a long time ago.
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms
|
Hi
What about these rules:
[1] (Pa/valve).LT.50W
[2] THD.LT.50%
[3] T.GE.10sec
[4] total amp Pa .LT. 1000W
[5] no limit to HT voltage or current
[6] classes D, E and F disallowed
BW
Nick Sheldon |
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Gregg
Guest
|
| Posted:
Thu Dec 30, 2004 5:35 pm Post subject:
Re: Tube drag racing! |
|
|
Behold, nick_sheldon signalled from keyed 4-1000A filament:
[6] classes D, E and F disallowed
:-(
*throws pulse/coil idea in trash*
--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca |
|
| Back to top |
|
|
Tim Williams
Guest
|
| Posted:
Fri Dec 31, 2004 6:02 am Post subject:
Re: Tube drag racing! |
|
|
<nick_sheldon@yahoo.com> wrote in message
news:1104407774.452262.188720@c13g2000cwb.googlegroups.com...
| Quote: | [1] (Pa/valve).LT.50W
[2] THD.LT.50%
[3] T.GE.10sec
[4] total amp Pa .LT. 1000W
[5] no limit to HT voltage or current
[6] classes D, E and F disallowed
|
One question.
Why.
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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mick
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| Posted:
Fri Dec 31, 2004 9:06 pm Post subject:
Re: Tube drag racing! |
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On Thu, 30 Dec 2004 19:02:58 -0600, Tim Williams wrote:
| Quote: | nick_sheldon@yahoo.com> wrote in message
news:1104407774.452262.188720@c13g2000cwb.googlegroups.com...
[1] (Pa/valve).LT.50W
[2] THD.LT.50%
[3] T.GE.10sec
[4] total amp Pa .LT. 1000W
[5] no limit to HT voltage or current [6] classes D, E and F disallowed
One question.
Why.
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It may be more fun to have different classes based on the number of pins
and/or top caps... :-) I could flash test an EA50 on the 36kV tester at
work without immediate competition from a transmitting valve then! <grin>
--
Mick
(no M$ software on here... :-) )
Web: http://www.nascom.info
Web: http://projectedsound.tk |
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