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#1
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a small valve amp
1watt p/ch 12au7x2
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#2
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a small valve amp
Cute! Here's its daddy. :-)
Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "ZACK`" wrote in message ... 1watt p/ch 12au7x2 |
#3
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a small valve amp
"Tim Williams" wrote in message ... Cute! Here's its daddy. :-) Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "ZACK`" wrote in message ... 1watt p/ch 12au7x2 is that a 7/ch or 2/ch how many watts |
#4
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a small valve amp
"ZACK`" wrote in message
u... is that a 7/ch or 2/ch how many watts Monoblock, all 7 in PPP class AB, around 7W output. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |
#5
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a small valve amp
http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386
I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.livejournal.com/userinfo.bml?user=fleetie |
#6
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a small valve amp
"Fleetie" ... http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Battery stuff, directly heated, so the filament is also the cathode. On a penthode G3 is almost always connected to the cathode. Could be something like: 1 f 2 f + g3 3 g1 4 g2 5 anode Arie de Muynck |
#7
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a small valve amp
On Sun, 4 Jan 2009 20:08:36 -0000, "Fleetie"
wrote: http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Paste into browser... tubedata.itchurch.org/sheets/127/5/5886.pdf ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | If we knew what we were doing, it wouldn't be called research... -- Albert Einstein |
#8
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a small valve amp
On Sun, 04 Jan 2009 20:08:36 +0000, Fleetie wrote:
http://cgi.ebay.com/LOT%2F2-RAYTHEON...-PENTODE-TUBE- PAIR-NIB_W0QQitemZ120352344397QQcmdZViewItemQQimsxZ2008 1220? IMSfp=TL081220111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something They are pentodes. http://www.radiomuseum.org/tubes/tube_ck5886.html -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info Filtering everything posted from googlegroups to kill spam. |
#9
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a small valve amp
Thanks, guys!
Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.livejournal.com/userinfo.bml?user=fleetie |
#10
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a small valve amp
On Sun, 04 Jan 2009 13:31:34 -0700, Jim Thompson
wrote: On Sun, 4 Jan 2009 20:08:36 -0000, "Fleetie" wrote: http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Paste into browser... tubedata.itchurch.org/sheets/127/5/5886.pdf ...Jim Thompson Nominal grid current 3 fA. John |
#11
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a small valve amp
On Sun, 04 Jan 2009 18:09:08 -0800, Archimedes' Lever
wrote: On Sun, 04 Jan 2009 16:22:44 -0800, John Larkin wrote: On Sun, 04 Jan 2009 13:31:34 -0700, Jim Thompson wrote: On Sun, 4 Jan 2009 20:08:36 -0000, "Fleetie" wrote: http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Paste into browser... tubedata.itchurch.org/sheets/127/5/5886.pdf ...Jim Thompson Nominal grid current 3 fA. John Extrapolated. Extrapolated from what? No, I'm sure this was measured. I have seen and used a picoammeter. I have never seen a femtoammeter. It's easy to measure fet gate or tube grid current, into the attoamps, thousands of electrons per second. The first time I got my hands on some RCA small-signal mosfets, I was astounded at the pA gate currents. Just make a follower and connect its input to a low-leakage capacitor, an air cap in the extreme. Short the cap, open it, and monitor the source or cathode with a DVM. Watch the voltage change with time. Do the math. Easy. John |
#12
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a small valve amp
On Sun, 04 Jan 2009 20:58:39 -0800, Archimedes' Lever
wrote: On Sun, 04 Jan 2009 18:52:14 -0800, John Larkin wrote: On Sun, 04 Jan 2009 18:09:08 -0800, Archimedes' Lever wrote: On Sun, 04 Jan 2009 16:22:44 -0800, John Larkin wrote: On Sun, 04 Jan 2009 13:31:34 -0700, Jim Thompson wrote: On Sun, 4 Jan 2009 20:08:36 -0000, "Fleetie" wrote: http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Paste into browser... tubedata.itchurch.org/sheets/127/5/5886.pdf ...Jim Thompson Nominal grid current 3 fA. John Extrapolated. Extrapolated from what? No, I'm sure this was measured. I have seen and used a picoammeter. I have never seen a femtoammeter. It's easy to measure fet gate or tube grid current, into the attoamps, thousands of electrons per second. The first time I got my hands on some RCA small-signal mosfets, I was astounded at the pA gate currents. Just make a follower and connect its input to a low-leakage capacitor, an air cap in the extreme. Short the cap, open it, and monitor the source or cathode with a DVM. Watch the voltage change with time. Do the math. Easy. John In other words... extrapolated. You take a measure of a voltage,and calculate (read extrapolate) the amperage. That's measured, not extrapolated. How do you think your picoammeter works? Does it count electrons passing? Calculate is not the same as extrapolate: http://en.wikipedia.org/wiki/Extrapolate "In mathematics, extrapolation is the process of constructing new data points outside a discrete set of known data points." You make a positive effort to be Always Wrong. John |
#13
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a small valve amp
On Sun, 04 Jan 2009 21:22:12 -0800, Archimedes' Lever
wrote: On Sun, 04 Jan 2009 21:06:12 -0800, John Larkin wrote: On Sun, 04 Jan 2009 20:58:39 -0800, Archimedes' Lever wrote: On Sun, 04 Jan 2009 18:52:14 -0800, John Larkin wrote: On Sun, 04 Jan 2009 18:09:08 -0800, Archimedes' Lever wrote: On Sun, 04 Jan 2009 16:22:44 -0800, John Larkin wrote: On Sun, 04 Jan 2009 13:31:34 -0700, Jim Thompson wrote: On Sun, 4 Jan 2009 20:08:36 -0000, "Fleetie" wrote: http://cgi.ebay.com/LOT%2F2-RAYTHEON...20111004r23386 I'm having a "stupid moment": They are sold as pentodes, yet have only 5 leads. What about the heaters? Well, the heater connections must be exposed, else they wouldn't work, so what about the other 2 electrodes? Martin - obviously missing something Paste into browser... tubedata.itchurch.org/sheets/127/5/5886.pdf ...Jim Thompson Nominal grid current 3 fA. John Extrapolated. Extrapolated from what? No, I'm sure this was measured. I have seen and used a picoammeter. I have never seen a femtoammeter. It's easy to measure fet gate or tube grid current, into the attoamps, thousands of electrons per second. The first time I got my hands on some RCA small-signal mosfets, I was astounded at the pA gate currents. Just make a follower and connect its input to a low-leakage capacitor, an air cap in the extreme. Short the cap, open it, and monitor the source or cathode with a DVM. Watch the voltage change with time. Do the math. Easy. John In other words... extrapolated. You take a measure of a voltage,and calculate (read extrapolate) the amperage. That's measured, not extrapolated. How do you think your picoammeter works? Does it count electrons passing? No, it is a direct reading, and goes directly in the circuit. We were testing PMT supply leakage. Calculate is not the same as extrapolate: Sure it is. http://en.wikipedia.org/wiki/Extrapolate "In mathematics, extrapolation is the process of constructing new data points outside a discrete set of known data points." Exactly. The current is the UNKNOWN data point. You construct the value based on data points taken OUTSIDE a direct current reading. So you "conclude" the value from reading of other types of data taken. ie extrapolate. You make a positive effort to be Always Wrong. You're an idiot, Johnny. You always resort to this stupid remark. Because you're Always Wrong. John |
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