It's? 6-32 hardware.? ?6-32 has a? .138" diameter thread (3.51 mm).? ? The 32 means it has 32 threads per inch.?
|
Are you referring to the screws that mount the tube sockets?? Common thread sizes are 6-32, 8-32 and 10-32 or 10-24 . Mike
Hello ? On my Drake amplifier, I would like to install additional hardware using existing threaded rods (3-500Z support spacers). If I measure the thread diameter, I get a reading of 3.3 mm (1/7 inch). The existing nuts measure 6.1 mm (1/4 inch) across the flat. ? Can you tell me the US thread size for this type of thread? ? -- F1AMM Fran?ois
|
Re: CTR Engineering/W8JI Response?
We have more ??
And more to come
Will be around for a very long time, im 43
Eventually we will be winding plate chokes and selling parts for Ameritron pa’s
toggle quoted message
Show quoted text
|
Hello ? On my Drake amplifier, I would like to install additional hardware using existing threaded rods (3-500Z support spacers). If I measure the thread diameter, I get a reading of 3.3 mm (1/7 inch). The existing nuts measure 6.1 mm (1/4 inch) across the flat. ? Can you tell me the US thread size for this type of thread? ? -- F1AMM Fran?ois
|
Re: Total insanity....500KW 11m amp being built.
Little mistakes at those Power Levels goes BOOOOOOMMMMMMM !
Hi Jim,
Your're exactly right!?? i agree, the Only way is grid drive.?? Thanks for taking time do the math and and expose the massive plate? current on peaks.
Regardless, it's a crazy project but we are getting to exercise our imagination and exploring the limits of big steel tubes.
73's, Mike?
VK6ADA
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
|
Re: Total insanity....500KW 11m amp being built.
Hi Jim,
Your're exactly right!?? i agree, the Only way is grid drive.?? Thanks for taking time do the math and and expose the massive plate? current on peaks.
Regardless, it's a crazy project but we are getting to exercise our imagination and exploring the limits of big steel tubes.
73's, Mike?
VK6ADA
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
|
Re: Total insanity....500KW 11m amp being built.
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
|
SVHFS Presenters & Conference Update
Below is an update on the schedule of speakers and presentations for the Southeastern VHF Society Conference. The conference will be held at the Quality Inn at Exit #4 in Clarksville, TN April 4-5, 2025. This is an opportunity to meet other VHF+ enthusiasts, learn, exchange ideas, and have FUN. The $69 registration fee for the?conference is required, and it includes a 1 year membership in the SVHFS. Details are here:?. Advance registration?is highly recommended as the hotel requires a head count in order to prepare the food for the event. There will be door prizes given away at the banquet on Saturday evening. Feel free to contact me??via?email if you have any questions:? RobinK4IDC@....
Preliminary 2025 SVHFS Conference Schedule Friday 8:00 AM Registration 9:00 Charles Osborne -K4CSO – RF Zero - 30 min 9:30 Robin Midgett – K4IDC – RF Zero 2 Meter Beacon- 30 min 10:00 Bob Lear – W4ZST Power Dividers and Cable Loops – 30 min 10:30 15 Minute Break 10:45 Mike Stipick – KC4RI – 5.7 GHz SDR Transceiver - 45 min 11:30 Bill Pence – Grid Square Locator – 30 min 12:00 PM Lunch - Steve and Sandra Kostro – Designing a Multi Band Transverter 1:15 2:00 Paul Wielozenski - K4PEW - VHF Nets – 30 min 2:30 Ben Lowe – Rover Radiators – 30 min 3:00 George Presley – 10 GHz Beacon – 30 min 4:00 Charles Osborne / Kent O’ Dell – 10GHz Antenna test Range - 30 min 5:00 Dinner –On your own 7:00 Swap Fest and Hospitality Suite Saturday 9:00 AM Brian McCarthy – Lunar Rover Truck, 2.3GHz Amp – 1 hour 10:00 Peter Van Horne – KA6U - Moon Bounce Rover – 45 min 10:45 15 Minute Break 11:00 Chris Arthur - NV4B – 45 min 12:00 PM Lunch - On your own 1:30 Larry Cagle - K4WLO – Meteor Scatter with MSK144 - 45 min 2:15 SVHFS Business Meeting 3:00 – 5:00 Rover Round Up and 10GHz Antenna Range 6:00 Social Hour- Hotel Bar 7:00 Dinner Banquet followed by the Door Prize Extravaganza!?
Thanks,
Robin Midgett K4IDC
|
Re: CTR Engineering/W8JI Response?
Harbach doesn't have the goodies he has.
On 3/15/2025 2:56 AM, Amp Guy Llc
wrote:
FYI
Harbachelectronics.com items ship the next business day On
2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR
recently: how long did it take to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in
his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
--
See my QRZ.com page at
|
Re: CTR Engineering/W8JI Response?
I’ve tried ordering from him in the past by emailing him as requested on his website. I never received a reply also.
Chuck. K1KW
Sent by radio waves
toggle quoted message
Show quoted text
On Mar 15, 2025, at 5:56 AM, Amp Guy Llc <kb1sel@...> wrote:
?FYI
Harbachelectronics.com items ship the next business day On 2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
Re: CTR Engineering/W8JI Response?
FYI
Harbachelectronics.com items ship the next business day On 2025-03-15 00:56, Steve wrote:
toggle quoted message
Show quoted text
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
Re: CTR Engineering/W8JI Response?
TNX, Alek!
73, Steve K0XP
On 3/15/2025 12:02 AM, Alek Petkovic
via groups.io wrote:
Hi
Steve.
I have found that Tom has a lot on his plate but he will get
around to your order or email enquiries as soon as he can. CTR
Engineering is pretty much a one man show.
Yes, shipping costs are calculated and advised specifically for
your order.
Bieing retired and in Australia, I accept that everything takes
time, so I don't mind if it takes a while before he can address my
questions or order. I'm very patient.
Anyway, his stuff is all very good and well worth the wait.
73, Alek VK6APK.
On 15/03/2025 2:56 pm, Steve wrote:
For those who have ordered from CTR
recently: how long did it take to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in
his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
--
See my QRZ.com page at
|
Re: CTR Engineering/W8JI Response?
Hi Steve.
I have found that Tom has a lot on his plate but he will get around to your order or email enquiries as soon as he can. CTR Engineering is pretty much a one man show.
Yes, shipping costs are calculated and advised specifically for your order.
Bieing retired and in Australia, I accept that everything takes time, so I don't mind if it takes a while before he can address my questions or order. I'm very patient.
Anyway, his stuff is all very good and well worth the wait.
73, Alek VK6APK.
toggle quoted message
Show quoted text
On 15/03/2025 2:56 pm, Steve wrote: For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
CTR Engineering/W8JI Response?
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 22
12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 22
Here, the series bank of 2500 uf @ 450 vdc lytics is uniquely wired up, in it's final config.? The ring terminal / spade lug is lopped off a sta-kon crimp connector, leaving just the barrel.? ?The barrel is then slid over the round pins of the lytics.? ?16 ga silver / stranded / teflon wire is inserted into the barrel, along with the solid 16 ga (.052")? lead of a 6 amp RVS connected diode, and also one end of the 100K? @ 3 watt MOF EQ resistor.? (1% Tolerance).? ?The resistors? all measure exactly? 99,800 ohms.? On paper, the V drop across each lytic should be identical. (375 vdc).? Diss in each resistor is 1.4 watts.
The function of the RVS connected diode across each cap, is in the unlikely event that if one leg of the main FWB rectifier assy failed shorted, you would end up with a condition whereby raw AC? from the plate xfmr sec, would be pumped into the string of lytics, causing severe damage to them.? ?The RVS connected diodes in this case, would conduct, bypassing the caps.... and taking out the HV fuse #2.
?(located between? sec of plate xfmr and input to fwb).? ?The replacement costs for those lytics is very expensive. (non issue if an oil cap was used)
After? crimping, the? tops and bottoms of each barrel are then soldered.? This makes for a 100%? solid connection, both mechanically and electrically.? ?
Originally, those lytics were designed to be mounted to a PC board.? The 3rd (un-used) pin was to make for a small tripod, for better support.? ?In this application,? the caps are inverted, and mounted with nylon capacitor clamps.? ?The 330 cfm (filtered) intake air will 1st pass? by the caps,? before going into the planum of the RF deck.?
|
Re: Total insanity....500KW 11m amp being built.
Anytime a radiator is initially filled, like in a car, it's? typ? vac filled.? ?The last thing you want is trapped air? anywhere in the loop.? ?That would be a disaster on a 100 kw water cooled tube.? ?I'm assuming the large air cooled radiator will be outside the shop, ( to dump the heat to the outside)..... so lengthy water lines? will be involved.? IE: the total loop distance has increased.?
|
Re: Total insanity....500KW 11m amp being built.
In VO stokes book, they avoid water cooling and vapour phase cooling like the plague.? ?U can't use glycol mixed with distilled water. That combo will eat the inside of the tube.? Reason it has been used in the past for commercial broadcast is? if the commercial AC power went out at a remote site in winter...say a hill top, the water would freeze..... resulting in busted water lines, tube, pumps, radiator etc.?
Notice on asamoto's ASI site, he loops the water line inboard on the 1st loop, then the 2nd loop touches the RF deck sidewall....then it's off to the rear wall? water fitting.? ?That's done for a reason, to get max distance on the waterline...b4 it touches any metal.?
Water purity and filtering has to be done....along with resistivity.?
?
20 GPM at high pressure is no mean feat.? ?My garden hose is 4 gpm.?
I still want to see the proposed? tank coil.?
This is not an amp, you want to document on u tube..... with several flaws in the....'design'....then make urself look silly.? ?It's not engineered at all, it's ill conceived.?
|
Re: Total insanity....500KW 11m amp being built.
May be the end of the channel owner. Utter failure might be a hard thing to recover from. Seeing as though on the world stage .
Perhaps people will finally see there is no true knowledge , all smoke and mirrors.
toggle quoted message
Show quoted text
On 2025-03-12 15:50, Jim VE7RF via groups.io wrote: Correct. They use trial and error. They have no clue how much RF
current is flowing through any component. They just.....'pile
drive' the crap out of anything and everything...then wonder why the
tube doesn't last. Ditto with parts. They overheat and blow up, or
peak V arcs something. The last goofy one I saw on De luna's fb
page.... was where a fellow used magnet wire for the coil on the tuned
input, fine..... but he had a mile long magnet wire...going to the
cathode of the gg triode.
Mike, good detailed description. Problem is..... typ 11m op
wouldn't have a clue how to plate modulate anything.
Why mess with AM is beyond me....esp when using a linear amp in AM
mode. As I have shown before, SSB has a 12.04 db advantage over
AM.
EG: CXR is 6 kw........swings to 9 kw. Pep out is 24 kw. When
it swings from 6 - 9 kw, that's 3 kw of total sideband power...with
just 1.5 kw into each sideband. You could get 1.5 kw into one
sideband with a 8877.
Same tube, with 24 kw pep out on ssb. 24 kw / 1.5 kw = 12.04 db.
This is why linear AM is such a wasted effort.
IF I was a hardcore 11 m op....... I would put up 2-3-4 stacked
yagi's....and clean house. Then worry abt the amp.....and also deep
six AM mode.
Links:
------
[1] /g/ham-amplifiers/message/41074
[2] /mt/111589618/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
|
Re: Total insanity....500KW 11m amp being built.
Correct.? They use trial and error.? They have no clue how much? RF current is flowing through any component.? ? They just.....'pile drive'? the crap out of anything and everything...then wonder why the tube doesn't last.? Ditto with parts.? They overheat and blow up, or peak V? arcs something.? ?The last goofy one I saw on De luna's? fb page.... was where a fellow used magnet wire for the coil on the tuned input, fine..... but he had a mile long magnet wire...going to the cathode of the gg triode.?
Mike,? good detailed description.? ? Problem is..... typ 11m op wouldn't have a clue how to plate modulate anything.?
Why mess with AM is beyond me....esp when using a linear amp? in AM mode.? ?As I have shown before,? SSB has a 12.04 db? advantage over AM.?
EG:? ?CXR? is? 6 kw........swings to 9 kw.? Pep out is 24 kw.? ?When it swings from 6 - 9 kw, that's? 3 kw of total sideband power...with just 1.5 kw into each sideband.? ?You could get 1.5 kw into one sideband with a 8877.
Same tube, with 24 kw pep out on ssb.? ?24 kw / 1.5 kw =? 12.04 db.? ?This is why linear AM? is? such a wasted effort.?
IF I was a hardcore? 11 m op....... I would put up? 2-3-4? stacked yagi's....and clean house.? ?Then worry abt the amp.....and also deep six? AM mode.??
|
Re: Total insanity....500KW 11m amp being built.
This is the best entertainment yet on this group!
In a previous post there were a set of specs that indicated "plate modulation" of the final running Class C and an audio requirement of 70KW! No details on that. That in itself is a major undertaking, including where to find a mod transformer! Then how to T-R this whole set up.
I also saw that they intended to use glycol treated water for cooling! THAT will not work. Distilled water with resistance monitoring is required. Been there before on a commercial project that eventually abandoned water cooling. Too many maintenance issues. A bunch of amateurs will NOT figure this out.
Yeah...entertaining....I suspect at some point it all will go away when either it blows up (100%) or they figure out it's hopeless design.
If those CB'ers want a big signal, then I suggest for a fraction of the cost of this amp, an antenna system would be FAR better for those additional db's.
-Chuck K1KW
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Amp Guy Llc Sent: Wednesday, March 12, 2025 2:36 PM To: [email protected]Subject: Re: [ham-amplifiers] Total insanity....500KW 11m amp being built. They don’t calculate , they use the trial and error method. They think it’s normal to loose a doorknob cap, vacuum variable capacitor, tube etc. Swap part with the next size up and repeat. On 2025-03-12 10:28, HaL Mandel via groups.io wrote: When bolting-up the tube sockets for the GU-84b's
I could tell they were some doozies.
Cleaning the silver metal without removing
it from plated instead of solid metal contact
areas required a toothbrush and a pile or two
of Kool-Amp silver plating powder to get the
'low hanging fruit' acceptable.
The big surprise for me were these green glazed
oblong-shaped capacitors with silver metal flat
contacts on each end. They formed a circle around
one of the concentric parts of the sockets.
The grid port, going back through the neutralizing Breuhne bridge
is bypassed, or perhaps better named as "loaded" with a non-inductive
450 ohm, 50 watt 1% resistor that can easily be replaced
or removed as the neutralizing process is analyzed on the bench.
With the cost of all these little specialized pieces taking longer to
agree with myself that the purchase will probably be useful has
gauged my efforts in getting this project 'hot' and making satellite
contacts on 10m.
This is why, looking at the 500MW nuclear reactor experiment
elsewhere, I wonder who performed the calculations for each
and every component, and how did the design choice fare on
a peer review for viability, feasibility and reasonability?
Hal
W4HBM
Links:
------
[1] /g/ham-amplifiers/message/41070
[2] /mt/111589618/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy -- This email has been checked for viruses by Avast antivirus software. www.avast.com
|
Mike Peace
Robin Midgett