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[VE7RF]

Here, the pair of 60 uf (at 5 kv) oil caps are mounted. Caps will be wired in series, and 4 x 100k bleeders used. Center junction of resistors is wired to center junction of the series caps.  Each oil cap is isolated from each other..and chassis. This ensures each oil cap has the same V drop across it.  6.5 kv unload  B+, so 3250 v across each of the 5 kv rated caps.

3 x contactors used in total, with contacts in parallel.  The 'small' 0-270 vac @ 5 amp variac will be used to control the fil V.    2 x 7.5 vac @ 50 amp fil xfmrs are wired in parallel..to handle the tubes 7.0 vac @ 79 amp CCS requirement.  The variac will get it's own right angle drive, so the fil V adjustment can be done on the rear apron.

The big  EBM-Papst blower  will hang off the top lid of the B+ supply..and will provide 330 cfm @ .9" pressure for the tube.(tube requires 204 cfm @ just .4" pressure, but by using the bigger blower, the CCS anode diss is increased  by 20% to
7.2 kw.  This is with a 40 deg C (104 F) ambient intake air temp.  With a more normal 20-25 C (68-75 F) intake air temp, CCS anode diss is further increased to 8 kw CCS.   It's an easy tube to cool, due to it's small ceramic..'stem' (identical to a 3CX-3000A7)...and large diameter anode fins, esp on the underside of the fins.

2 x holes with mating finger guards on side of B+ supply, allow for the air intake to the blower.  The 330 cfm room air will also cool all the components, like plate and fil xfmr's, bleeders etc.     

A  custom gasket will be used between  top lid of B+ supply...and bottom lid of the smaller RF deck box, that will sit on top of the B+ supply.  That's how the compressed air gets to the cathode plenum..then up through the anode fins..and exhausted out the custom, screened portion of the top lid of RF deck.

It will all come together in the next 1-3 days. Scott has a bunch of SB-220's and Various Ameritron amps to fix, so has severe time constraints as is.

https://www.youtube.com/watch?v=98e93-CIN7c

[N4MQ]

?? WHY ??

[AA7IS]

?? WHY ??

He's been going on and on with these posts, I think it's some sort of strange flex. I know I'm not impressed I've known too many TRUE AMP builders over the last 60 years or so, put this boy to shame.
A W8JI wanna be lmao!!

[N6PJB]

Why not?

[KC0W]

 I'm kinda excited about the prospects of seeing it doing it's thing at 10kW. Hopefully by PART 30 it will happen............All good things take time. 


                                                                           Tom KH0/KC0W

[SWMAN]

 Looks good to me, just curious how much will this little beast cost when finished, amp, power supply and everything.

[VE7RF]

?? WHY ??

He's been going on and on with these posts, I think it's some sort of strange flex. I know I'm not impressed I've known too many TRUE AMP builders over the last 60 years or so, put this boy to shame.
A W8JI wanna be lmao!!

Really ?  This is what the client wanted, so this is how I designed it. No less, no more.  None of this is any any engineering books I have, nor in any ARRL / ORR publication.   The rule of thumb is.... if you don't post pix...IT NEVER HAPPENED.   I have only been involved with 3 x 6M amps in the past, so have limited experience.  This is #4.    6M is not like 80m, it's a whole different ballgame..and then some.  This 6M RF deck has some unique features that you won't see in other amplifiers.  For a GG triode amp, it's well designed and built.

160-10m, 15 kw pep out, bandswitched..... piece of cake, albeit expensive. Been there, done that too...old news.  There is big, then there is too big.  There is a practical upper limit on this stuff...esp with just the typ...'200 amp' service coming into a home. If you require more PO, then 400 amp service required.  10-15 kw pep output is the practical upper limit in most cases.  The next 3db is where issues arise.  Keep it below 20 kw pep, and  inexpensive 7-16 DIN connectors can be used. Start using 1 5/8" (or 3 1/8")  flange connectors...and you will require deep pockets.

QSK, with 20 kw out on CW is old news, already done that, starting in 2007. 45 kw out, using QSK CW is the max upper limit...done that too.    Perhaps you and your imaginary friends can post several hundred pix for us.  100 kw pep out is a non issue..... the issue is the 3 phase power required to run the mess.

[SWMAN]

 Good job, but how much is it in price. 

[VR2AX]

"https://www.youtube.com/watch?v=98e93-CIN7c"

I have to say, seriously, and with no disrespect to the builder, does that look like a 10kw ccs out (20kw ccs input) power supply?

[KM4AH]

"https://www.youtube.com/watch?v=98e93-CIN7c"

I have to say, seriously, and with no disrespect to the builder, does that look like a 10kw ccs out (20kw ccs input) power supply?

I was a little curious about that myself.  My little home brew amp transformer is 2 amps CCS at 4000 DC and it looks bigger than that to me. But, copper and iron don't lie and I think he said it weighs 300 or 350 pounds.

[VE7RF]

 Just got off the phone with Scott. The shipping weight of the xfmr was 320 lbs.  It came on a small pallet that weighed
perhaps 10-12 lbs.   Then packed on 5 sides with layers and layers of cardboard, then the steel cinch bands.  Scott can manhandle and dead lift a 205 lb xfmr.... but not this one.  There was no lifting hooks on top, so him and his helper manhandled one corner up onto the  bottom of the new power supply box, then the other corner...then manhandled it all on, and slid into it's final place. Then bolted down.     It's  4400 vac @ 4 amps  CCS /  17.6 kva CCS.   

On my own 253 lb Dahl xfmr, it came on a small pallet, with pallet covered in a solid sheet of wood, then a 5 x sided wood box on top of that.  I got very lucky..... I had a helluva time getting the 5 x sided box off. The xfmr was exactly 3/16" higher than the bottom of my rack cabinet, so slid it straight across..then bolted down.  Mine came with the lifting hooks..which were not used.  In some cases, either steel winch cable / chain is used, and a temp steel spreader bar is placed between the cable / chain, and 2 x big folks can either lift, or use an engine hoist, to lift the xfmr...then the rack is slid under the xfmr....then xfmr lowered back down.  My 253 lb Dahl is 16" x 16" x 10.75" thick. 5200 vac @ 3 amps CCS. The hypersil pair of cores are good for 20 kva CCS per Dahl himself.  The smaller 10 kva CCS  Dahl xfmr's are only 127 lbs, and just under 1 cubic foot, abt the same as a 10 kva pole pig (120 lbs out of the oil). My 253 lb dahl is double the weight of the 10 kva dahl, but only 50% more VA.    The 441 lb dahl is a solid 30 kva CCS, and is 19" x 19" x 13" thick. I considered it initially, and Dahl talked me out of it, said the 253 lb xmr was ample for my application.

On my 127 lb Dahl 4 H choke,  I used a come along, and top lid of new hammond rack temp removed, and a 4" wide channel aluminum piece placed across the top of the rack.  Winch cable went across at an angle to lifting hooks on choke. Temp clamps on the basement ceiling joists held the temp angle aluminum pieces pointed straight down.  That prevented the new cab from flipping over.  Got it in ok, then bolted down.   

Stay tuned for part #19, which I will post in a few mins.                 

[VR2AX]

Just goes to show how appearances can be deceptive. I had to remind (check) myself the density of iron/copper, about 500 lb per cubic foot...so on reflection not a surprising result!

[VE7RF]

Just goes to show how appearances can be deceptive. I had to remind (check) myself the density of iron/copper, about 500 lb per cubic foot...so on reflection not a surprising result!

 1 cubic foot of copper = 559 lbs.   Copper is typ 1-2% heavier than steel.  Didn't think it was any where near that per cubic foot.

[SWMAN]

Looks like the builder doesn’t want to tell me the finished price of the unit.

[VE7RF]

Looks like the builder doesn’t want to tell me the finished price of the unit.

I sent u a PM  via eham, abt this, a few days ago, on feb 27th.