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Message |
    
Big_thunder
Junior Member
Username: Big_thunder
Post Number: 16
Registered: 9-2004
| | Posted on Friday, October 15, 2004 - 7:54 pm: | 
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I bought 3 572b tayor tubes didn't last 3 day very little talking was done on tubes went down quick. what is the best brand to buy and where can you buy them ? I'm waiting on response on the bad tubes hope I can get a refund. |
Bulldog369
Intermediate Member
Username: Bulldog369
Post Number: 182
Registered: 2-2004
| | Posted on Saturday, October 16, 2004 - 7:41 am: |
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TRY VACUMTUBESINC.COM.. THEY ARE OUT OF fla.... I BOUGHT MY TUBES THERE.. VERY GOOD.. HAD THEM WITHIN 3 DAYS... |
Big_thunder
Junior Member
Username: Big_thunder
Post Number: 17
Registered: 9-2004
| | Posted on Saturday, October 16, 2004 - 1:40 pm: |
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Bulldog what type of tubes did you get and what brand do they carry? thanks for the infor I have seen them on the website. |
Bulldog369
Intermediate Member
Username: Bulldog369
Post Number: 187
Registered: 2-2004
| | Posted on Saturday, October 16, 2004 - 7:00 pm: |
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i bought 6ju6's brand i can not remember now... but they are pretty good company... they have thousands of tubes... i have had mine now for about 10 months an they are going strong. |
Bruce
Senior Member
Username: Bruce
Post Number: 1686
Registered: 9-2003
| | Posted on Saturday, October 16, 2004 - 8:25 pm: |
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rfparts.com and tubesandmore.com |
Big_thunder
Junior Member
Username: Big_thunder
Post Number: 27
Registered: 9-2004
| | Posted on Tuesday, November 23, 2004 - 1:35 pm: |
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I would like to know if there is a good brand that makes the 572b other than the centron, they are the best but is there another brand out that you know of that is a dependable brand. |
Legend
Member
Username: Legend
Post Number: 70
Registered: 12-2002
| | Posted on Tuesday, November 23, 2004 - 8:38 pm: |
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Are the 572b's interchangable with the EL-509 (519)? Can you run 572's in a KLV-1000?
I saw this printed somewhere, but I can't remember where. |
Gage
Intermediate Member
Username: Gage
Post Number: 107
Registered: 7-2003
| | Posted on Tuesday, November 23, 2004 - 8:56 pm: |
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Big Thunder
I own a AL-572 bought it used ran great for about four months then low output!I sent the amp in where I got it from they said nothings wrong just the tubes are a little weak so I had them replace the tubes(572b).
The original tubes Sevtlana 572b-Made in Russia
New tubes from Pentalabs Made in China told should be just as good as originals or better!
Well I'm back in the same place as before low output.These tubes should last longer than that.
I was told that improper tuning could be the cause.I did read the manul and got input from where I got the amp from.
I give up since this is a long weekend I'll put the old tubes back in and see what happends.
Take care All and have a Good Thanksgiving Weekend!
Gage!CEF-114 |
Tech808
Moderator
Username: Tech808
Post Number: 4146
Registered: 8-2002
| | Posted on Tuesday, November 23, 2004 - 11:12 pm: |
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Big thunder,
http://www.rfparts.com/572b.html
Hope this helps.
Lon
Tech808
CEF808
N9OSN |
Legend
Member
Username: Legend
Post Number: 71
Registered: 12-2002
| | Posted on Wednesday, November 24, 2004 - 3:49 am: |
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Hello? |
Tech808
Moderator
Username: Tech808
Post Number: 4147
Registered: 8-2002
| | Posted on Wednesday, November 24, 2004 - 6:01 am: |
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Legend,
From the pictures I have seen of the 572B tubes they are 4 Pin tubes where the EL519/6KG6 tubes have 9 Pins.
If you click on the link in my above Post it gives you a clear picture of them.
Hope this helps.
Lon
Tech808
CEF808
N9OSN |
Tech808
Moderator
Username: Tech808
Post Number: 4148
Registered: 8-2002
| | Posted on Wednesday, November 24, 2004 - 6:53 am: |
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Gage,
TUBE BURN IN
Transmitting tubes generally require a “burn in” time to increase emission to its nominal value. In broadcast stations, 100-200 hours at rated filament voltage is allowed for burn in. This initial operation allows the getters, materials which absorb and hold residual gas, to finish the vacuum of the tube in its final operating environment. In an Amateur Radio amplifier, tubes will often require 50-200 hours of “key down” transmit time to remove the residual gas and condition the filament for full emission. It is well advised to allow tubes to operate in standby mode (filaments on, no transmit) for 10 hours before tune-up.
The 811A, 572B, 3-500Z, 4-400, etc. utilize a thoriated tungsten filament, which is highly dependent upon sufficient filament temperature to provide adequate electron emission for normal operation. Emission increases as the thorium migrates towards the surface of the filament wire. This is why it is recommended to “burn in” these tubes before operation.
QUALITY OF CHINESE TUBES
When Chinese tubes were first imported to the U.S., we found quality inconsistent and varied from factory to factory. Early 811A, 572B, and 3-500Z tubes also suffered from filament weakness. RF PARTS has worked closely with what we have found to be the best military electronics tube factory to improve product quality.
You could have received what they call NOS (New Old Stock) Tubes.
http://www.rfparts.com/tubeapp.html
Hope this helps.
Lon
Tech808
CEF808
N9OSN
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Viking
Intermediate Member
Username: Viking
Post Number: 170
Registered: 2-2002
| | Posted on Wednesday, November 24, 2004 - 11:08 am: |
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The EL509's I believe are the replacement (with modification?) for the 8950 tubes. A cheaper alternative to the 572's is 811A's. |
Big_thunder
Junior Member
Username: Big_thunder
Post Number: 28
Registered: 9-2004
| | Posted on Wednesday, November 24, 2004 - 8:08 pm: |
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Hello guys thanks for infor , hey gage the best tube i do know is the centron 572b I was just wondering if there was another one out there . LET me tell you again centron are the best and will not let you down I have some and they are the best but little expensive. |
Crafter
Senior Member
Username: Crafter
Post Number: 1043
Registered: 12-2002
| | Posted on Wednesday, November 24, 2004 - 9:43 pm: |
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Prefer Penta's, especially where they are mounted sideways and not sitting vertical. |
Kilowatt
Intermediate Member
Username: Kilowatt
Post Number: 108
Registered: 2-2004
| | Posted on Thursday, November 25, 2004 - 11:16 am: |
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Yep, love those Pentas! |
Legend
Member
Username: Legend
Post Number: 72
Registered: 12-2002
| | Posted on Thursday, November 25, 2004 - 6:33 pm: |
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So, does that mean that an 8950 will plug right into a KLV-1000 with no modification necessary?
I am only asking because I have 8 brand new 8950's and nothing to do with them other than selling them. I was wondering if they could be used as spares for the EL-509. |
Mike0228
Junior Member
Username: Mike0228
Post Number: 17
Registered: 6-2004
| | Posted on Friday, November 26, 2004 - 9:07 am: |
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Seems I've heard there is some relationship between Centron evolving into Taylor but can't recall right now. I'm very surprised to hear you had problems with Taylor as they have been proven good. I use a Heathkit SB-200 on 20M that still has the original Centron 572 tubes in it. They are about 40 yrs old and I get 600W pep out of them.
Are you using your amp on AM and if so what output? Most amateur amps aren't made to push big numbers on AM.
Mac |
Big_thunder
Junior Member
Username: Big_thunder
Post Number: 31
Registered: 9-2004
| | Posted on Sunday, January 09, 2005 - 9:32 am: |
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Hey Mike I'm using am and I have some centron that I,ve had for a while they are doing great I had another guy tell me that he had problems with taylor tubes so when I need to replace them I will get some more centron. |
Sg569
Junior Member
Username: Sg569
Post Number: 22
Registered: 12-2004
| | Posted on Sunday, January 09, 2005 - 10:43 am: |
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Seeing as how everybody is talking tubes here, anybody know where to get tube amp plans, ac, or dc would not matter. I just want to build a tube amp. Doesn't everybody?? |
