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Something efficient and has very low losses.

Joe WB9SBD

On 10/2/2023 10:48 AM, DupyRail wrote:

Wondering what kind of antenna is used that will handle this much power?

A

On 10/2/2023 10:33 AM, Jim VE7RF wrote:

I designed this amp (back in 2007) for a buddy, who is now SK. Current owner is in MT. It uses a custom 253 lb Dahl plate xfmr and 24 x 3900uf lytics. Vac relays used for the input + cut off bias. Paralleled Jennings RJ2B's used for the output. We tested the manually tuned, tuned input with a 800 watt CCS cxr for 10 mins, on each band. Input swr is dead flat across all bands. Triple wafer model 85 switch used for the 12 kw PI net. Multronics MI-14 1/2" tubing coil used for 160-80-60-40-30m. HB 1/2 tubing coil used for 20-17-15-12m. This is a 9 band amp. 1000 pf @ 15 kv jennings tune cap. 3000 pf @ 5 kv jennings load cap. Bias is adjustable, on the fly with a 20 position rotary switch. Dual line section bird, with 25 kw forward slug and 1 kw reverse slug. Pep board also installed. Kicks offline if reflected power too high. 10 kw out with 500w of drive. 12 kw with 600 watts of drive. 7-16 DIN output connector. I also have a spare, nib blower, on my shelf. 253 lb dal xfmr has pri taps at 198-208-218 vac....and also 230-240-250 vac. Sec taps at 2300, 2900, 3900, 4600, 5000, 5400 vac. ( single phase 60 hz). 3 x 300 amp contactors used on the 240 vac input. One per each leg..and the 3rd one used for the step start. Separate step start and variac used for the fil xfmr. There is only 5600 hrs on the hour meter. You need 200 amp service...and also a 100 amp breaker installed in the main 200 amp panel...and a min of 3 ga copper wire from main panel to amp.

If interested, contact the seller below.

A SUPERBLY HAND BUILT 3CX-6000A7 HF AMPLIFIER IN A 6 FT RACK ON WHEELS. DESIGNED BY A PROFESSIONAL ENGINEER. PETER DAHL HV SUPPLY WITH TAPS DELIVERS UP TO 8000 VDC AT 3 AMPS. ANY TRANSCEIVER WITH A 500 WATT INTERMEDIATE AMP CAN PRODUCE OVER 10KW OUTPUT. INPUT AND OUTPUT BAND SWITCHES WITH TUNED PI NETWORKS FOR ALL HAM BANDS 160-12 METERS AND TUNABLE TO OTHER HF FREQUENCIES 3.5-24 MHZ. HUGE ADJUSTABLE OUTPUT VACUUM CAPS AND VACUUM RELAYS. ADJUSTABLE BIAS FOR BOTH LINEAR AND CLASS C. EXTENSIVE METERING, PROTECTION CIRCUITS AND FUSING THROUGHOUT. OVER $10,000 IN PARTS AT 2010 PRICES AND UNTOLD HOURS WERE SPENT BUILDING AND PERFECTING THIS INCREDIBLE MACHINE. WE CALL IT THE MONSTER AMP. ASKING $10,000 OR BEST OFFER. WE HAVE DETAILED PHOTOS. ONSITE DEMONSTRATION OF THIS AMP’S OPERATION AND CAPABILITES IS AVAILABLE IN MONTANA. TOO HEAVY TO SHIP. SERIOUS BUYERS CALL 406-240-5428 OR 406-830-6360 FOR MORE INFORMATION. NOTE: OPERATION HIGHER THAN 1500 WATTS IN US HAM BANDS VIOLATES FCC RULES.

-- 
"Where the Old Soo crossed the New Soo"
Duplainville, Wisconsin

Web page:  

Youtube Channel:  

-- 
"Where the Old Soo crossed the New Soo"
Duplainville, Wisconsin

Web page:  

Youtube Channel:  

<Think how "clean" a well built 12kw would be at 1500 out.??

<Don W4DNR

That would be like running a SB-220? at? 150 watts pep out.....wasted effort really.?

To run that amp at reduced power, the B+ needs to be reduced by using the lower taps on the sec of the plate xfmr.? ?Then the plate load Z remains the same.?
IE:? use the 2900 V tap...and drive to 1/2 normal plate current.? ?PO is now 3 kw.? Or use the 2300 V tap for even lower PO.?

With the Dayton blower used, and a 25 deg C (77F) inlet air temp, the CCS anode diss is 8 kw.? ?The blower is a 2 x speed type.? ?The lower speed is more than ample for SSB / CW use.? It also has a switch on the front panel to change blower speeds.? The front panel was powder coated.? The socket, tube, chimney and fil xfmr were all brand new.? The only thing used was the pair of Jennings vac tune + load caps...and variac for the fil xfmr.? All 4 vac relays are sped up with an overvoltage.? It's the same amp that I posted 57 pix of, years ago on the old yahoo? group.? When it switched to groups.io? the pix were not transferred over to the new group.? It's also got a new hr meter to keep track of hrs on the fil.? In normal operation, the 7.0 vac fil was reduced to just 6.3 vac (after 200 hrs @ 7.0 vac).? Bucketloads of emission. On paper, the tube should last 35k hrs.? Tube is rebuildable.? Tube is rated for 3.5 amps CCS.? In normal operation it was 2.1 amps? for 10 kw...and? 2.5 amps? for 12 kw.?

It's built like a fn tank.? ?It rolls around on steel casters.? Footswitch plugged into the amp, so it could be keyed from the garage for tune up.? In normal operation, all the various freqs for each band were logged on a cheat sheet, for both the output and the input. So it was just....'dial it up by the numbers' after that.? IE: dial up pre-sets.? ?Took 45 secs to get from 15m down to 160m.? Good enough.? It's a 24" wide rack.? ?Plate xfmr is 253 lbs.? Forget what the total weight is, I think around 400 lbs.??

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Think how "clean" a well built 12kw would be at 1500 out.??

Don W4DNR

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-----Original-Nachricht-----

Betreff: Re: [ham-amplifiers] 12 kw 160-12m amp for sale.

Datum: 2023-10-02T17:48:08+0200

Von: "DupyRail" <andytron434@...>

An: "[email protected]" <[email protected]>

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Any trapless yagi? or wire ant will handle it easily.? 12.8 kw is 16 amps into 50 ohms.? RMS voltage is? 16 x 50 =? ?800 volts rms? = 1131 volts peak.?
The CM choke is the trick part.? ?Here,? RG-393 teflon coax is used.?

?

For 160m use,? 7 turns of 393 coax are wound onto 5 x 2.4" OD? (type 31 cores).? This results in aprx 5.5k ohms.? 2 x identical CM chokes are used in series...= 11 k ohms.?
For 75m use, 7 turns of 393 coax are wound onto 5 x 2.4" OD ( type 31 cores).? This results in 7.6 k ohms.? 2 x identical CM chokes are used in series? =? ?15.2 k ohms.?

For 40m use,? 6 turns of 393 coax are wound onto 5 x 2.4" OD? ( type 31 cores).? ? This results in 6.6 k ohms.? ?Again, 2 x identical CM chokes are used in series? =? 13.2 k ohms.

Each CM choke assy? is installed inside a 8" x 8" x 4" thick plastic NEMA? box.? You can get the Nema plastic box's at any home depot, Lowes, etc...in the electrical dept. .?

And no, they don't over heat nor blow up.? ?I use Permatex dielectric grease on the gasketed lid..... and seal it up tight.? Also pack each nema box with a lot of silica gel ..aka...'desiccant'.?

?

Only 1/2 of the applied voltage appears across the choke.? EG:? 400 vrms? into? 11k ohms =? (400 v squared ) / 11,000 ohms =? 14.5 watts.? ?That's 7.25 watts? per nema box..( and even less when 13.2 and 15.2 k ohms are used)..? And that's with a? 12.8 kw CCS CXR into a 1:1 swr.?

?

On SSB, average power is only 29% of pep out....and that's with a lot of processing.? ?Average power on CW is higher than SSB.? ? But peak V is STILL? the same, regardless of duty cycle...or mode.? Average current is way less.? EG: .29 x 12.8 kw = 3.741 kw.? ?3.741 kw average =? 8.7 amps average current.?

?

It's average current that melts stuff...... and peak V that arcs stuff.? ? And if stacked yagi's are used, each only handles 1/2 the applied power ( if 2 yagi's used....and only 1/3 power, if 3 x yagi's used).?

?

Typ, depending on mode and freq used,? ?LMR-600 and bigger is used for main coax.? ?ALL? connectors are 7-16 DIN.? ?Typ,? RG-393 teflon coax is used for rotor loops....or? LMR-600UF.?

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I designed this amp (back in 2007) for a buddy, who is now SK. Current owner is in MT. It uses a custom 253 lb Dahl plate xfmr and 24 x 3900uf lytics. Vac relays used for the input + cut off bias. Paralleled Jennings RJ2B's used for the output. We tested the manually tuned, tuned input with a 800 watt CCS cxr for 10 mins, on each band. Input swr is dead flat across all bands. Triple wafer model 85 switch used for the 12 kw PI net. Multronics MI-14 1/2" tubing coil used for 160-80-60-40-30m. HB 1/2 tubing coil used for 20-17-15-12m. This is a 9 band amp. 1000 pf @ 15 kv jennings tune cap. 3000 pf @ 5 kv jennings load cap. Bias is adjustable, on the fly with a 20 position rotary switch. Dual line section bird, with 25 kw forward slug and 1 kw reverse slug. Pep board also installed. Kicks offline if reflected power too high. 10 kw out with 500w of drive. 12 kw with 600 watts of drive. 7-16 DIN output connector. I also have a spare, nib blower, on my shelf. 253 lb dal xfmr has pri taps at 198-208-218 vac....and also 230-240-250 vac. Sec taps at 2300, 2900, 3900, 4600, 5000, 5400 vac. ( single phase 60 hz). 3 x 300 amp contactors used on the 240 vac input. One per each leg..and the 3rd one used for the step start. Separate step start and variac used for the fil xfmr. There is only 5600 hrs on the hour meter. You need 200 amp service...and also a 100 amp breaker installed in the main 200 amp panel...and a min of 3 ga copper wire from main panel to amp.

If interested, contact the seller below.

A SUPERBLY HAND BUILT 3CX-6000A7 HF AMPLIFIER IN A 6 FT RACK ON WHEELS. DESIGNED BY A PROFESSIONAL ENGINEER. PETER DAHL HV SUPPLY WITH TAPS DELIVERS UP TO 8000 VDC AT 3 AMPS. ANY TRANSCEIVER WITH A 500 WATT INTERMEDIATE AMP CAN PRODUCE OVER 10KW OUTPUT. INPUT AND OUTPUT BAND SWITCHES WITH TUNED PI NETWORKS FOR ALL HAM BANDS 160-12 METERS AND TUNABLE TO OTHER HF FREQUENCIES 3.5-24 MHZ. HUGE ADJUSTABLE OUTPUT VACUUM CAPS AND VACUUM RELAYS. ADJUSTABLE BIAS FOR BOTH LINEAR AND CLASS C. EXTENSIVE METERING, PROTECTION CIRCUITS AND FUSING THROUGHOUT. OVER $10,000 IN PARTS AT 2010 PRICES AND UNTOLD HOURS WERE SPENT BUILDING AND PERFECTING THIS INCREDIBLE MACHINE. WE CALL IT THE MONSTER AMP. ASKING $10,000 OR BEST OFFER. WE HAVE DETAILED PHOTOS. ONSITE DEMONSTRATION OF THIS AMP’S OPERATION AND CAPABILITES IS AVAILABLE IN MONTANA. TOO HEAVY TO SHIP. SERIOUS BUYERS CALL 406-240-5428 OR 406-830-6360 FOR MORE INFORMATION. NOTE: OPERATION HIGHER THAN 1500 WATTS IN US HAM BANDS VIOLATES FCC RULES.

-- 
"Where the Old Soo crossed the New Soo"
Duplainville, Wisconsin

Web page:  

Youtube Channel:  

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My Bird 5Kw? reads 50r + - 2 ohms through 900mhz ,? but I wouldn't hesitate to feed my 30S-1 into a 60 ohm load.

Don W4DNR?

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