|
N3DRB The Derb
Guest
|
 |
« on: October 19, 2009, 06:15:30 PM » |
|
i want to use these blowers, the little one on the 4E27 rig, and the larger Dayton unit on 4-400's. the little one says it needs a cap which I have; a oil bathtub rated at 400 volts. the back of the blower has 3 terms marked with colored dots. green, yellow, and red. yellow and red had wires, green had never been used. Never hooked one of these up before. Any ideas on how the cap goes? Does the Dayton unit need a cap?  |
|
|
|
Logged
|
|
|
|
WA1GFZ
Member
 Offline
Posts: 11152
|
|
« Reply #1 on: October 19, 2009, 07:39:05 PM » |
|
I don't think that is enough blower for a pair of 4-400s unless it is turning over 3000 rpm.
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #2 on: October 19, 2009, 10:05:31 PM » |
|
The small one I want to put on the 4E27. The Dayton was gonna be fer the 4-400's.
here's the marks offa the Dayton. I'll do a search on the model.
ok it's 15 cfm at 3340 rpm. I'm gonna buy another one and just do 2 1 holers. Should work for singles.
|
|
|
|
Logged
|
|
|
|
WA1GFZ
Member
Offline
Posts: 11152
|
|
« Reply #3 on: October 20, 2009, 08:20:30 AM » |
|
Look up in Eimac care and feeding to see what you need. Check with a "U" tube. Hot tubes die young
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #4 on: October 20, 2009, 11:31:17 AM » |
|
I went to school. Those Daytons will work ok fine for singles, a bit on the hairy edge for a pair.
I'm just gonna do singles. if I can't strap with a single 4-400 @ 2500 v, another wont help me much. Fools gold.
Since I can get more, I'll just get another matching one and have 2 decks 1 per big rack. it all worketh out FB.
|
|
|
|
|
Logged
|
|
|
|
KM1H
Contributing
Member
Offline
Posts: 3519
|
|
« Reply #5 on: October 20, 2009, 11:43:19 AM » |
|
That Dayton will blow a pair fine if you use the proper sockets. Eimacs specs are for that old cast aluminum air restrictor.
Use either the plastic Eimac or a Johnson.
Carl
KM1H
|
|
|
|
|
Logged
|
|
|
|
N4LTA
Contributing
Member
Offline
Posts: 1075
|
|
« Reply #6 on: October 20, 2009, 02:46:29 PM » |
|
The 4-400 a data sheet only requires 14cfm at .25" pressure. That is with an Eimac socket.
I have a couple of brand new aluminum ones that I plan to use.
Pat
N4LTA
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #7 on: October 20, 2009, 02:52:49 PM » |
|
welllllll.......I do have a dual 4-400 fil transformer........  I dunno. Thing must weigh 40 pounds. |
|
|
|
|
Logged
|
|
|
|
N4LTA
Contributing
Member
Offline
Posts: 1075
|
|
« Reply #8 on: October 20, 2009, 03:42:35 PM » |
|
I am building a single 4-400 so if you need an Eimac cast socket - let me know.
Pat
N4LTA
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #9 on: October 20, 2009, 07:33:46 PM » |
|
ok will do. i have lots of Johnson 275's, prolly just use them.
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #10 on: October 20, 2009, 07:38:13 PM » |
|
anybody got any idea on the EAD mini blower connections? I really want to use that on the 4E27. I dont know if they mean use the cap as a motor start cap or a motor run cap.
|
|
|
|
|
Logged
|
|
|
|
ke7trp
Contributing
Member
Offline
Posts: 3659
|
|
« Reply #11 on: October 20, 2009, 07:56:52 PM » |
|
My Dual 4-400s use two blowers Twice that size back to back forcing air up the chimneys. This box runs FULL bore though and its needed. I have another one of those datons If you need it let me know.
I think its enough for duals if its plumbed right and if you dont plan on leaving it keyed for hours. My Globe king 500C has one with no chimney and uses small blower pressurizing the chassis. The tube never over heats even at 375 watts for a single and 120% mod.
|
|
|
|
|
Logged
|
|
|
|
Ed/KB1HYS
Contributing
Member
Offline
Posts: 1852
|
|
« Reply #12 on: October 20, 2009, 10:52:54 PM » |
|
interesting discussion. I was wondering about what the Globe Kings did for cooling the finals. Seems that the recommended airflow can be achieved more easily than I thought. Though the penalty for to much airflow is a bit more blower noise, while the penalty for not enough is tube death.
|
|
|
|
|
Logged
|
73 de Ed/KB1HYS
Happiness is Hot Tubes, Cold 807's, and warm room filling AM Sound.
"I've spent three quarters of my life trying to figure out how to do a $50 job for $.50, the rest I spent trying to come up with the $0.50" - D. Gingery
|
|
|
ke7trp
Contributing
Member
Offline
Posts: 3659
|
|
« Reply #13 on: October 20, 2009, 11:15:21 PM » |
|
The king as a Very small blower. But the pins and seals are cooled. They dont run the tube more then 300-330ma at 1800 volts so in that sense, Its ok. But at 4000 and 500MA, Its a different story  |
|
|
|
|
Logged
|
|
|
|
w4bfs
W4 Beans For Supper
Contributing
Member
Offline
Posts: 1433
more inpoot often yields more outpoot
|
|
« Reply #14 on: October 21, 2009, 07:54:32 AM » |
|
hi Derb ... the 3 conx small blower needs the phase shift cap, most likely ... as I recall from a long time ago, one wire gets power, one wire gets cap and the last one gets cap and wire to power return .... just ballast with a small incandescent lamp (40 W ) or so and try the mix of connections until it works ... the ballast will stop loud explosions  |
|
|
|
|
Logged
|
Beefus
O would some power the gift give us
to see ourselves as others see us.
It would from many blunders free us. Robert Burns
|
|
|
WA1GFZ
Member
Offline
Posts: 11152
|
|
« Reply #15 on: October 21, 2009, 02:13:26 PM » |
|
Even the plastic sockets come up against the bottom of the tube with small holes between the pins. So you need enough pressure to move 14 CFM of air through them. So build it and mount a water U tube to see if you have at least .25 inches. Another trick I have used is add a muffin fan on the top side to suck air out but you need a sealed box.
|
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #16 on: October 21, 2009, 11:17:38 PM » |
|
I'm gonna take the EAD blower up to Beider's electric motor repair place in Martinsburg along with the cap and have them test it and hook it up for me. I dont feel comfy trying out this or that. I want it to work and be ready for me to hook up. 10 cfm should be ok fine for a single 4E27.
|
|
|
|
|
Logged
|
|
|
|
The Slab Bacon
Member
Offline
Posts: 3934
|
|
« Reply #17 on: October 22, 2009, 07:51:36 AM » |
|
I'm gonna take the EAD blower up to Beider's electric motor repair place in Martinsburg along with the cap and have them test it and hook it up for me. I dont feel comfy trying out this or that. I want it to work and be ready for me to hook up. 10 cfm should be ok fine for a single 4E27.
If they want to charge you for it, dont do it. Bring it down when you come down to pick up the "Derbophone" and I will wring it out for you. It's a simple test. Just work on mounting and plumbing it for now. I should have the "Derbophone" done next week sometime. I hope to maybe finish it up this weekend. |
|
|
|
|
Logged
|
"No is not an answer and failure is not an option!"
|
|
|
KM1H
Contributing
Member
Offline
Posts: 3519
|
|
« Reply #18 on: October 22, 2009, 09:33:45 AM » |
|
This might help selecting hamfest or surplus shop blowers. The math is uncomplicated. Naturally slow=quiet. You can also use a PTT controlled relay to run a high speed blower thru a resistor in standby. http://en.wikipedia.org/wiki/Affinity_lawsCarl KM1H |
|
|
|
|
Logged
|
|
|
|
|
N3DRB The Derb
Guest
|
|
« Reply #19 on: October 22, 2009, 10:41:10 AM » |
|
well, I thought they could test it for me at the same time they show me how to wire it. It's WW2 vintage, and while it seems to be nice and spinny without wobbles or side to side play in the shaft, considering how old it is might be a good idea to hear it play before I settle on it. I could just use the dayton. thats brand new.
I'll call em and see if they wanna charge me, if so I'll just mount it up and wait till we get together. Do you want me to bring my extra R175A choke down for the amp?
|
|
|
|
|
Logged
|
|
|
|
|
