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Enough- Now to a Choke
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Rich & DJ
Back to Radio / Amp stuff
Hello all you smart people, I don't have any electrical training but I am slowly building an amp from my junk box. The power supply is complete. I enjoyed the information about "glitch" protection and did a cut and paste of all the important notes, making my information list to build by. I will use a 50ohm resistor and a small gage wire as a fuse in the HV line. I will also put in a fuse c/t of the filament / bias line. I don't have much money (retired) to buy but a lot of stuff to build with. My next thing to figure out is the plate choke for a 4-1000A, I plan on about 3500v, first test, it nothing goes up in smoke I can later up the voltage to 4500. The amp will be a mono-bander at first, 21Mhz. With out a dip meter is there a simple way to build a HV plate choke. I will not load it to the max , just trying to make something work. Rich , kd0zz |
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Harold Mandel
¿ªÔÆÌåÓýDear Rich, ? Look at your reflector archives for the past couple of days. ? There¡¯s a ham who is selling all sorts of amplifier parts, including plate chokes. ? W2CQM, Ron Lumachi. ? He¡¯s been on the reflector forever, and he has some great stuff. ? Hal W4HBM ? From:
ham_amplifiers@... [mailto:ham_amplifiers@...] On Behalf Of Rich & DJ ? ? ? Back to Radio / Amp stuff ? Hello all you smart people, I don¡¯t have any electrical training but I am slowly building an amp from my junk box. The power supply is complete. I enjoyed the information about ¡°glitch¡± protection and did a cut and paste of all the important notes, making my information list to build by. I will use a 50ohm resistor and a small gage wire as a fuse in the HV line. I will also put in a fuse c/t of the filament / bias line. I don¡¯t have much money (retired) to buy but a lot of stuff to build with. My next thing to figure out is the plate choke for a 4-1000A, I plan on about 3500v, first test, it nothing goes up in smoke I can later up the voltage to 4500. The amp will be a mono-bander at first, 21Mhz. With out a dip meter is there a simple way to build a HV plate choke. I will not load it to the max , just trying to make something work. ? Rich , kd0zz ? ? |
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Rich & DJ
Thanks Hal , yes I remember seeing the parts , I guess I forgot to add I
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am trying to hand make all that I can. I have completed a hand made, 12Kv plate variable capacitor. I know I could buy one but then I can't say I made it. I have a 1" dia phenolic rod for a form and/or 22mm glass tube that could be mounted on a dowel to make a choke with. I was hoping to do a single wind of 20ga magnet wire. If I can do this and all does not go up in smoke , I plan on then looking for a vac variable plate cap and a band switch and building one for 40 thru 15 , I don't go below 40 and work 15 the most. I have an extra socket , chimneys , fil transformer and such for the next amp. I built the P/S so it is in its own cabinet on wheels , 0 to about 5Kv @ 1 amp. The RF deck will sit on top. Rich , kd0zz -----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...] On Behalf Of Harold Mandel Sent: Thursday, January 04, 2007 5:45 PM To: ham_amplifiers@... Subject: RE: [ham_amplifiers] Enough- Now to a Choke Dear Rich, Look at your reflector archives for the past couple of days. There's a ham who is selling all sorts of amplifier parts, including plate chokes. W2CQM, Ron Lumachi. He's been on the reflector forever, and he has some great stuff. Hal W4HBM _____ From: ham_amplifiers@... [mailto:ham_amplifiers@...] On Behalf Of Rich & DJ Sent: Thursday, January 04, 2007 6:06 PM To: ham_amplifiers@... Subject: [ham_amplifiers] Enough- Now to a Choke Back to Radio / Amp stuff Hello all you smart people, I don't have any electrical training but I am slowly building an amp from my junk box. The power supply is complete. I enjoyed the information about "glitch" protection and did a cut and paste of all the important notes, making my information list to build by. I will use a 50ohm resistor and a small gage wire as a fuse in the HV line. I will also put in a fuse c/t of the filament / bias line. I don't have much money (retired) to buy but a lot of stuff to build with. My next thing to figure out is the plate choke for a 4-1000A, I plan on about 3500v, first test, it nothing goes up in smoke I can later up the voltage to 4500. The amp will be a mono-bander at first, 21Mhz. With out a dip meter is there a simple way to build a HV plate choke. I will not load it to the max , just trying to make something work. Rich , kd0zz |
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Hi Dick --
Good luck on your 4-1000A amplifier. I built one back in the 70s and you can see it at: 1000A%20Amp/4-1000a1.htm I was going to mention a cost-saver for you since you mentioned about building your amp a low cost. Many years ago I read a suggestion, I believe in 73 Magazine, where a fellow suggested using a 1 gallon pickle jar as a replacement for the more expensive Pyrex chimney for a 4-1000A. He cut out the bottom and enlarged the top and claimed it fit the air socket just fine. At the time I read that I think my regular Pyrex chimney cost me $12 but I put that bit of information in the back of my skull in case I ever needed to have another one or a replacement. So far I've never had to use it. You mentioned that you already had a chimney so you won't need that bit of info either but it might be worth remembering for something. The plate choke I used in my amp was commercially available but I don't recall the manufacturer. They probably aren't in business now anyway. (Oh no....I hope that doesn't resurrect the recent thread on the ham_amplifier reflector which had nothing to do with ham_amplifiers.) Good luck on your project. There's nothing quite like the feeling you get from throwing the switch on a 3500+ volt power supply connected to a newly-build but totally-untested amplifier. You've heard about people who saw their whole life flash before their eyes? That's similar. 73, Jim - K5LAD On 4 Jan 2007 at 17:05, Rich & DJ wrote: Back to Radio / Amp stuff"It's so simple to be wise. Just think of something stupid to say and then don't say it." -- Sam Levenson ======================================= My Web Page - |
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Randy
Jim:
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Just to throw in my $.02, I forget which tube it was, but the glass from Coleman lanterns are supposed to make fine chimneys for one or the other, and heat isn't such a concern. I'm sure somebody will pipe up with the answer, I just mention it also along the lines of saving $. 73, Randy KZ4RV K5LAD@... wrote:
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Rich & DJ
I don¡¯t think the Coleman works on the 4/or3-1000 I think its for the
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3-500 size. I hope to sneak up on the 3500V , I know it wont tune just right but I will soft start it with an autotransformer , not just flip 3500v to it cold. Then increase the drive. It does have a standard soft start set up in the PS. Rich -----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...] On Behalf Of Randy Sent: Thursday, January 04, 2007 7:31 PM To: ham_amplifiers@... Subject: Re: [ham_amplifiers] Enough- Now to a Choke Jim: Just to throw in my $.02, I forget which tube it was, but the glass from Coleman lanterns are supposed to make fine chimneys for one or the other, and heat isn't such a concern. I'm sure somebody will pipe up with the answer, I just mention it also along the lines of saving $. 73, Randy KZ4RV K5LAD@... <mailto:K5LAD%40arrl.net> wrote: net/~jpk5lad/4- <. <> net/%7Ejpk5lad/4-> 1000A%20Amp/4-1000a1.htmnet/~jpk5lad <. <>net/%7Ejpk5lad> |
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Rich & DJ
Thanks for the information, I already have two chimneys and fans for the
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4-1000¡¯s. I also sent you an off list e-mail. Rich , kdozz Subject: Re: [ham_amplifiers] Enough- Now to a Choke Hi Dick -- Good luck on your 4-1000A amplifier. I built one back in the 70s and you can see it at: . <> net/~jpk5lad/4- 1000A%20Amp/4-1000a1.htm I was going to mention a cost-saver for you since you mentioned about building your amp a low cost. Many years ago I read a suggestion, I believe in 73 Magazine, where a fellow suggested using a 1 gallon pickle jar as a replacement for the more expensive Pyrex chimney for a 4-1000A. He cut out the bottom and enlarged the top and claimed it fit the air socket just fine. At the time I read that I think my regular Pyrex chimney cost me $12 but I put that bit of information in the back of my skull in case I ever needed to have another one or a replacement. So far I've never had to use it. You mentioned that you already had a chimney so you won't need that bit of info either but it might be worth remembering for something. The plate choke I used in my amp was commercially available but I don't recall the manufacturer. They probably aren't in business now anyway. (Oh no....I hope that doesn't resurrect the recent thread on the ham_amplifier reflector which had nothing to do with ham_amplifiers.) Good luck on your project. There's nothing quite like the feeling you get from throwing the switch on a 3500+ volt power supply connected to a newly-build but totally-untested amplifier. You've heard about people who saw their whole life flash before their eyes? That's similar. 73, Jim - K5LAD On 4 Jan 2007 at 17:05, Rich & DJ wrote:
Back to Radio / Amp stuff |
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thank you
On Jan 4, 2007, at 3:44 PM, Harold Mandel wrote: R. L. Measures, AG6K, 805.386.3734 r@..., rlm@..., www.somis.org |
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Rich & DJ
I sniped off a lot of the original and replies.
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Thanks Rich for the reply, I saw the parts for sale but I am try to build what I can. I have completed a hand made, 12Kv plate variable capacitor. I know I could buy one but then I can't say I made it. I have a 1" dia phenolic rod for a form and/or 22mm glass tube that could be mounted on a dowel to make a choke with. I was hoping to do a single wind of 20ga magnet wire. If I can do this and all does not go up in smoke and I feel confident I plan on then looking for a vac variable plate cap and a band switch and building another one for 40 thru 15, I don't go below 40 and work 15 the most. I have an extra socket, chimneys, fil transformer and such for the next amp. I built the P/S so it is in its own cabinet on wheels, 0 to about 5Kv @ 1 amp. The RF deck will sit on top. Rich, kd0zz On Jan 4, 2007, at 3:44 PM, Harold Mandel wrote:
Look at your reflector archives for the past couple of days. to buy but a lot of stuff to build with. My next thing to figure |
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