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bullet/151 southern Indiana
| | Posted on Sunday, September 09, 2001 - 11:14 pm: | 
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does anyone know how to mod a D&A phantom 500
to run other tubes like say 572b's,or 811a's
el509's,ect,ect.
thanks bullet |
-=881=-™
| | Posted on Monday, September 10, 2001 - 1:06 am: |
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If you visit www.svetlana.com you will see an article for modifing a dentron sweep tube amp that uses 6LQ6 tubes like your phantom. With a little reading and some work you can use these instructions for your cause.
73
Sam
881
-=WorldWide881=-™
www.881.cjb.net |
doctor bleedover
| | Posted on Monday, September 10, 2001 - 5:27 pm: |
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to modify a phantom 500 to 572's there are a lot of problems.i was looking at this myself.
to get the tubes into the box,you could only use 2 and the fan would have to be moved.
the voltage in a phantom is about 900 and the power supply circut would have to be changed to a doubler to get the 1800 to 2200 you need.
the 572's are driven on the heaters so you would need a filament choke and a filament transformer.
for a schematic you could copy a heathkit sb220 or the yaesu 2100b .
it just seemed like too much work for the result you would get to me so i abandoned the idea.
doctor squash did yse a d&a warrior chassis to build a 4 572'b amp but i never saw it.
if you need schematic's for an amp you can get them at W7FG on the internet or by calling 1 800 807 6146.
they have excellent reproductions of manuals for amps and radios for around 20 bucks.
good luck,
doctor bleedover
larry from missouri |
vernonott
| | Posted on Monday, September 10, 2001 - 5:56 pm: |
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Bullet: Is there a special reason you are wanting to change out tube types.My old Phantom used to do 800 watts clean & clear.In fact several weeks ago I sold a friend two full sets of tubes that tested at 99%.I know a tech in the upper part of the state that works on tube equipment everyday and he does not like the Russian tubes for one reason or another.73's |
bullet/151 southern Indiana
| | Posted on Thursday, September 13, 2001 - 5:52 am: |
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lets see if this one goes thru.
881,doc bleedover,
thanx for the reply ive seen the svetlana page befor thats what made me think about other tubes(transmit) a fella i used to talk with in clarksville said he had his re fitted for 811a's
said he only has four tube in her but that it does 800 watts.i was wondering if anyone knew of this mod or similar.
im more than likly going to go the svetlana route
on mine seems like a easier fix.ive got 2 to retro fit so ease of mod will be nice.
vernonott,
ya retubing is getting to costly at 500-600 dollars a box,plus all these tubes out are old stock.these el509 tubes are being made today and looks like will be around a good while. and are much cheaper than the old 6lq6 and are more durrable/more wattage than the 6lq6.
ya ive had some 6lq6's that tested that good
did 997 watts on a bird 43 at the shop and did
it on my 43 at the house.but they dont last forever.im down to 1/2 power on one amp and 1/4 power on the other one.so its time to redo things.
have a great day guys 73's bullet |
Anonymous
| | Posted on Thursday, September 13, 2001 - 3:09 pm: |
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I WILL TELL YOU LIKE IT IS THE PHANTOM 500 IS A TUBE EATER DONT WASTE YOUR TIME SELL IT !!!! |
vernonott
| | Posted on Monday, September 17, 2001 - 4:57 pm: |
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bullet : I may have received false information but a tech told me today that the el 509 was designed to be a receiving tube and didn't last very long using it as a transmitting tube.I have no idea whether this is true or not. |
bullet
| | Posted on Monday, October 15, 2001 - 5:45 am: |
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the 6lq6 is also in that same class! |
Insider
| | Posted on Saturday, January 05, 2002 - 12:57 pm: |
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The EL 509 was used in the horizontal deflection circuits of color TVs. |
Scrapiron63
| | Posted on Saturday, January 05, 2002 - 5:54 pm: |
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Bullet, is the Phantom a 10 or 12 tuber. Are all the tubes bad, if not I would have them checked, and re-tube it. Of course if they are all bad, thats a different story. Those old d&a amps were some of the best in sound and dependability, most of them are at least 25 years old. They don't like a big keyup, but if you just put around 2 watts in with a good swinging radio, a 10 tuber will key 300-400 and swing 800 watts, with great sound. And your tubes will last years. I just bought one last year, the previous owner got it new in 1975, it still had some of the orginial tubes, a couple had shorted over the years. He had never run it on anything other than a Browning S23-R27 radio, that keyed about 2 watts, and he always 'rolled' the load over, dropped the keyup to about 250 watts, and let it do its thing. Scrapiron |
Rci2990
| | Posted on Wednesday, February 06, 2002 - 9:05 pm: |
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I had a 12 tuber(ive also had a 10 tuber and anotehr 12 tuber and 2 mav 250s) that did about 1 kw and it was well. LOUD!!! Those old D&A amps are built rock solid!!! Ive always wanted to try one behind a tube base rig like an old Robyn 240D or an old 40 channel Teaberry model T 40 channel just to see how they sound driver with a tube rig... |
Funtimebob
| | Posted on Wednesday, May 15, 2002 - 2:37 am: |
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I wish I could afford to build my own amp.
I've been working with the math and so far I've come up with most of the info to build a 6 tube 572B amp for about 2.1kw. just strictly as a math exercise. |
Jyd
| | Posted on Wednesday, May 15, 2002 - 2:35 pm: |
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should do alot more than that,i think 2 572b's are good for 800 to 1000 watts |
Funtimebob
| | Posted on Thursday, May 16, 2002 - 1:22 am: |
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They only recommend running the tubes at about 350 watts in the Amateur handbooks. 2400vdc@250ma each ICAS |
Jyd
| | Posted on Thursday, May 16, 2002 - 11:03 am: |
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what do you mean run about 350 watts?if the box puts out 800,how are you going to run it at 350 watts. |
409
| | Posted on Friday, May 17, 2002 - 4:31 am: |
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Yes you are correct , but this is class B biasing. Also note that drive is approx. 100 watts. |
Funtimebob
| | Posted on Friday, May 17, 2002 - 2:01 am: |
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350 watts output power. input power would be 600 watts per tube 2400vdc@250ma minus plate efficiency of the amp= appx 350 watts out per tube |
Funtimebob
| | Posted on Friday, May 17, 2002 - 3:01 pm: |
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They also recommend a negative 2vdc Bias and list the drive requirements at 15 watts per tube. some of The old Hallicrafters amps were Class B amps |
Cuddlebear
| | Posted on Monday, June 17, 2002 - 2:24 pm: |
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I had a Tech tell me that the reason most ppl don't like the Russian made tubes is because the quality is very low in the building process. He said that because Russia is a poor country they use "unpure" metals etc, in their building process and therefore causing quality problems. I have no idea if this is true, But it sure makes sense to me. |
Taz
| | Posted on Tuesday, June 18, 2002 - 4:36 am: |
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they take people in migs for cash to their government. Then will also take people in space. A bunch of their navys subs,battleships and vessels are sitting in mothballs because they cant afford to run them. |
Brad
| | Posted on Sunday, August 18, 2002 - 7:31 pm: |
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I've had my phantom 500 for two years now and would not part with it. i run it at about 375 watt deadkey and it swings 600 putting in 4 watts from my galaxy 2527. i talk from az. to florida and poeple say its so clear i sound like a local.they say i'm putting 9 s-units on them from west of phoenix here. i'm really impressed with the skylab i just bought from you and will give my a-99 away if someone wants it.a friend of mine is into tube stereo's and showed me a catalog that was selling 6lq6's for 19.95 a piece. i'll try to get that info on the forum as soon as i can. i have had my 500 tuned to a point where it put out 900 watts but there's no quality running it that hard, and no reason.brad. |
Brad
| | Posted on Thursday, August 22, 2002 - 8:32 pm: |
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I found the source for 6lq6's. it's called the antique electronic suppl co., ph. 480-820-5411
that's phoenix az. the last catalog i had listed these tubes at $19.95 each. give them a shout. brad. |
Jp1116
| | Posted on Friday, August 30, 2002 - 5:27 pm: |
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I believe the 19.95 is for used tubes and they have gone up to 24.95 in the latest catalog. Still better than the alternative, however, there is a place in Florida that sells them new for $35.00. Time to buy a SB-220 when it gets that expensive for tubes. |
Brad
| | Posted on Saturday, August 31, 2002 - 10:17 am: |
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i'd like an sb-220. i tried to buy one when i got the phantom but it wouldn't key up so i settled for the 500. it's been a good amp, iv'e never done anything to it except put a 4 inch computer fan on the left side to pull air through the tube section. seems to keep it stable, i haven't seen any power loss yet. |
Yote
New member
Username: Yote
Post Number: 1
Registered: 2-2004
| | Posted on Saturday, February 28, 2004 - 12:10 am: |
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Im looking to retube a phantom tripple stage 10 tube amp.Can you let me know where the place is in Florida that sells them for $35.00 is.Thank you. |
Pogo12
Junior Member
Username: Pogo12
Post Number: 30
Registered: 3-2005
| | Posted on Friday, June 16, 2006 - 4:18 pm: |
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Retube the phamtom with a Odd filament tube like the 24LQ6.You can still get them at a decent price and it just requires changing the filament wiring around. |
