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Re: New poll for ham_amplifiers
Peter Voelpel
Funny, the YC-156 TRIODE has 3 times that gain in GG.
I drive my grid driven 4CX3000A by a 4CX350a in class A which I integrated into the amp 73 Peter --- In ham_amplifiers@..., FRANCIS CARCIA <carcia@...> wrote: motivated by a pair of UTC CG310s on the high taps. I've read your article a number of times on the on you did Rick. Frank wa1gfz the 4cx3000A has a power gain of c. 60x. also work well in GG mode and have a bit more gain than the 4-1000A.R L MEASURES, AG6K. 805-386-3734 |
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Re: New Group
On Sep 20, 2006, at 2:36 PM, FRANCIS CARCIA wrote:
man you got that right John.....all that useless mail. The one on wiring back to the breaker panel that went on for ever sent me a runnin. my $50,000 alpha won't workUnmoderated is a euphemism for uncensored. // As I see it, when a member goes over the top, he will be ignored by the rest of the discussion group and. if given enough time. he eventually wither on the vine. This is essentially censoring by everyone. I call it democratic censoring. R L MEASURES, AG6K. 805-386-3734 r@... |
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Re: Moderator
Mike\(W5UC\) & Kathy\(K5MWH\)
¿ªÔÆÌåÓýThe absence of secret moderators is a blessing.? Now if we can just avoid month long discussions about the miniscule merits of harmonic suppressors.
Pentalabs wrote:
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Re: [-] Re: Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven
On Sep 20, 2006, at 4:01 PM, Paul Playford wrote:
It is information like this that maintains my interest in amateur radio.Are you interested enough to build one? My guess is that 6 of the Panasonic switchers would power an 8170 in SSB-mode, especially if an energy-storage C bank was connected to the output and the units were powered from a 50A electric range outlet. R L MEASURES, AG6K. 805-386-3734 r@... |
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Re: New poll for ham_amplifiers
FRANCIS CARCIA
I never tried driving the grid but in gg it is close to X15 when motivated by a pair of UTC CG310s on the high taps. I've read your article a number of times on the on you did Rick. Frank wa1gfz
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R L Measures wrote:
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Re: Moderator
On Sep 20, 2006, at 4:11 PM, pentalab wrote:
--- In ham_amplifiers@..., "w5uc" <w5uc@...> wrote:To thrive, like a TV soap opera, a discussion group needs a protagonist and an antagonist. Tom and yours truly are such. Without Tom, my guess is that there will be a lot less entertainment value.be stay tuned.R L MEASURES, AG6K. 805-386-3734 r@... |
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Can Grid Dissipation in metal GG triodes be increased ????
pentalab
Gents
On these 3CX-6000's and also the socketless version [ YC-243], I fool with from time to time, Eimac/ Svetlana state's the grid diss at 225 Watts CCS. [3CX-3000A7 is also 225 w CCS grid] Now, since the tube(s) can be operated in either GG OR grid driven.... it occured to me that in grid driven mode... the grid should still has a 225 w CCS rating ??? The point here is..... in GG service... you bolt this huge grid ring to the chassis.... and in the case of the socketless version.... an even bigger diam grid flange is bolted to the chassis ! Now... that alone should heatsink the grid ??? Since the grid is sitting in a vac... the only way for thermal heat to escape is via the grid flange. Since the below chassis compartment is pressurized... one might think the actual grid dissipation can perhaps be increased via this heatsink action ?? [GG mode] Am I out to lunch here ??? Later..... Jim VE7RF |
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Re: Censorship/Administrator
On Sep 20, 2006, at 4:18 PM, pentalab wrote:
--- In ham_amplifiers@..., FRANCIS CARCIA <carcia@...>The Z looking into the primary is a function of what's on the secondary. Silver soldering the remaining strands with 6%-Ag, 94%-Sn (221?C) solder is helpful. R L MEASURES, AG6K. 805-386-3734 r@... |
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Re: New poll for ham_amplifiers
In grid-driven service, the 4cx3000A has a power gain of c. 60x.
On Sep 20, 2006, at 4:51 PM, FRANCIS CARCIA wrote: Yup Mike,R L MEASURES, AG6K. 805-386-3734 r@... |
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Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven
Tnx, PAUL. Sounds like two Panasonic switcher supplies would run an 8877 om SSB.
On Sep 19, 2006, at 7:32 PM, w8aef wrote: I found the following web page:R L MEASURES, AG6K. 805-386-3734 r@... |
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Re: New poll for ham_amplifiers
FRANCIS CARCIA
Yup Mike, They all went to Frank because?I have a box of 4CX3000As. They also work well in GG mode and have a bit more gain than the 4-1000A.? wa1gfz? Mike Sawyer wrote:
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Re: Censorship/Administrator
pentalab
--- In ham_amplifiers@..., FRANCIS CARCIA <carcia@...>
wrote: to the shack. That one sent me running away.### I suggested at least 2 ga wire to my buddy. Turns out it shoulda been a heluva lot bigger.... once we determined the peak current on the 240 vac line.... every 8.3 msecs..... using Duncans amp tools. The chief culprit was the input Z of the plate xfmr primary [aprx 70 ohms]... and NOT the meassured .08 ohm Dc resistance. ### To get bigger wire to fit a 100 A breaker.... snip a few strands off the outer layer... and re-twist... fits like a glove. Later... Jim VE7RF |
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Re: Moderator
pentalab
--- In ham_amplifiers@..., "w5uc" <w5uc@...> wrote:
be kept a secret. Looking forward to enjoying the new group.### agreed ! This new group is gonna blow away the old 'amps' group.... hands down... stay tuned. Later... and greetings... from Jim VE7RF |
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Re: About 4-1000 family
pentalab
--- In ham_amplifiers@..., "David C. Hallam"
<dhallam@...> wrote: means the internal structure will handle very high current on a intermittentbasis. Others may give you a different take on the idle current, but nothaving a copy of that handbook I would think that is for 2 tubes. ZSAC (zero signal anode current) for AB1/AB2 is generally adjusted to give about 1/2of the rated dissipation of the tube(s).### The PR version will handle sky high plate voltages... like 10-30 KV. ### In GG... with around 7 v of zener bias.... and 4800V... I was seeing around 70 Ma ZSAC. [single tube] ### A small SPST CENTER OFF toggle switch and a string of diodes will provide 3 x bias positions..... and a rotary switch is the ultimate set up. I also found that the vdrop across the string of either 1N5408's or 6A1O's [ 1 kv - 6 A.. 400 A surge] diodes increases from aprx .7 V to almost .8 V when current thru em increases from 200 ma to 2 A. ### I installed 7 x 1000 uf lytics in parallel [7000 uf] across the entire mess of diodes...... resulted in superb bias regulation. Just beware... the wire leads from the diodes IS the heatsink for the diodes. The 6 A diodes run luke warm with 2 A CCS thru em. Later... Jim VE7RF
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Re: [-] Re: Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven
Paul Playford
It is information like this that maintains my interest in amateur radio.
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de Paul, W8AEF ----- Original Message -----
From: "Roger Glover" <r.glover@...> To: <ham_amplifiers@...> Sent: Wednesday, September 20, 2006 2:39 PM Subject: [-] Re: [ham_amplifiers] Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven Dave Smith VK3HZ did some ivvesigation of these, with interesting findings |
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Re: New poll for ham_amplifiers
Mike Sawyer
¿ªÔÆÌåÓýFrank,
??? I thought I took all your 4-1000's ;>) Welcome to the
new group.
Mod-U-Lator, Mike(y) W3SLK ----- Original Message -----
From: FRANCIS CARCIA
Sent: Wednesday, September 20, 2006 5:32 PM
Subject: Re: [ham_amplifiers] New poll for
ham_amplifiers Maybe we could change the pole to what size breaker can you trip.......I plea
the fifth
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Top band Reflector
Mike\(W5UC\) & Kathy\(K5MWH\)
Earlier today someone mentioned the top band reflector. I love 160 and can't
wait until the bands get quiet enough for it to be productive. However I have a lot to learn about building some kinda receiving antenna that will improve my reception. How do I find it? 73, Mike, W5UC |
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Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven
Dave Smith VK3HZ did some ivvesigation of these, with interesting findings at:
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www.users.bigpond.net.au/dwsmith/hv_inverter.pdf Roger ----- Original Message -----
From: "Dick" <pa3duv@...> To: <ham_amplifiers@...> Sent: Wednesday, September 20, 2006 9:33 PM Subject: [ham_amplifiers] Re: Panasonic/Matsushita Switcher HV-PS u-Wave Oven Very interesting Rich. |
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Re: New Group
FRANCIS CARCIA
man you got that right? John.....all that useless mail. The one on wiring back to the breaker panel that went on for ever sent me a runnin. my $50,000 alpha won't work?
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jcoupejr wrote:
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Re: New poll for ham_amplifiers
FRANCIS CARCIA
Maybe we could change the pole to what size breaker can you trip.......I plea the fifth
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ham_amplifiers@... wrote:
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