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Author Topic: how long will 3-500zg tubes be around?? 10 more years?  (Read 5084 times)
K1JK
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Posts: 207




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« on: June 21, 2011, 02:46:06 AM »

hey gang
i know tubes r on the way out,but how much longer will they
still make the 3-500zg??
5 more yrs,10yrs?Huh

thanks
jeff k
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KA5N
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Posts: 4380




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« Reply #1 on: June 21, 2011, 03:49:10 AM »

   

   6 years, 3 months, 21 days, 15 hours, 26 minutes, 14 seconds, 11 milliseconds,
   24 microseconds, 12 nanoseconds, and 6 picoseconds

   That's as close as I can get

   Stock up today!!!  (Also get some incandescent bulbs while you're at it)

Allen
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VR2AX
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Posts: 589




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« Reply #2 on: June 21, 2011, 04:26:50 AM »

Ask the horse…

HIGH HOPE INTERNATIONAL INC.
ADD:Floor 3 , Building 1 , 157 Zhuangpai Road , Nanjing 211106, China
TEL:86-25-5215-4950
FAX:86-25-8451-9409
E-MAIL:weijun@highhope.cn
http://HTTP://WWW.HIGHHOPE.CN
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WB2WIK
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« Reply #3 on: June 21, 2011, 08:55:10 AM »

   

   6 years, 3 months, 21 days, 15 hours, 26 minutes, 14 seconds, 11 milliseconds,
   24 microseconds, 12 nanoseconds, and 6 picoseconds


I read that also, but the disclaimer was this timing is plus or minus 20 years.

I doubt anyone could possibly know.

811As are still being made and they're a 75 year-old design.  The 3-500Z is a 40 year-old design.  So maybe it has another 35 years to go...
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W8JX
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« Reply #4 on: June 21, 2011, 09:56:58 AM »

What has help keep 811's and 572's alive and in demand is not just ham radio but rather audio too (especially 572's) as some audio buffs still prefer high power tube amps. Not sure if 3-500 has been ever used there.
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KB1NXE
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Posts: 310




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« Reply #5 on: June 21, 2011, 10:18:15 AM »

What has help keep 811's and 572's alive and in demand is not just ham radio but rather audio too (especially 572's) as some audio buffs still prefer high power tube amps. Not sure if 3-500 has been ever used there.

Not that I'm aware of, but it's a cool thought!  Fed by a pair of 6L6's or 572's, that would be a cool looking amp.  Especially with the Graphite anodes.  Some blue LEDs around the base of the tubes shining up and into the glass envelopes.

Now, just to find an audio transformer to handle the output.
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AH6RR
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« Reply #6 on: June 21, 2011, 12:00:37 PM »

Don't worry about it, the world will end when the Mayan calender runs out next year.  Grin I really dont have a clue it could be next week or 20 years from now.
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KA5N
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« Reply #7 on: June 21, 2011, 12:17:00 PM »

Not that I'm aware of, but it's a cool thought!  Fed by a pair of 6L6's or 572's, that would be a cool looking amp.  Especially with the Graphite anodes.  Some blue LEDs around the base of the tubes shining up and into the glass envelopes.
Now, just to find an audio transformer to handle the output.

Spend a little time looking at the sites that sell audio amp tubes and parts.  There is just about anything you can imagine.  But coupling capacitors go from $10 to $30 each.  Output transformers just shoot toward the stratosphere in price.  Plenty of tubes just bring plenty of money.  Everything must be identical to the original when repairs are made.  Lots of oxygen free stuff.  And they do indeed love
572 tubes.   
Groovy dawg
Allen

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AG6K
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Posts: 1




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« Reply #8 on: October 05, 2011, 03:18:16 PM »

hey gang
i know tubes r on the way out,but how much longer will they
still make the 3-500zg??
5 more yrs,10yrs?Huh

thanks
jeff k

  When I was working at Raytheon, Point Mugu, CA, Joe S., the senior engineer on the Sea Sparrow project said that if vacuum tubes were invented tomorrow, due to their ability to better withstand high temperature than transistors, they would be hailed as a technological breakthrough. (if you guessed Joe was a Ham, congrats)
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KG4NEL
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Posts: 373




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« Reply #9 on: October 05, 2011, 04:10:39 PM »

Not that I'm aware of, but it's a cool thought!  Fed by a pair of 6L6's or 572's, that would be a cool looking amp.  Especially with the Graphite anodes.  Some blue LEDs around the base of the tubes shining up and into the glass envelopes.
Now, just to find an audio transformer to handle the output.

Spend a little time looking at the sites that sell audio amp tubes and parts.  There is just about anything you can imagine.  But coupling capacitors go from $10 to $30 each.  Output transformers just shoot toward the stratosphere in price.  Plenty of tubes just bring plenty of money.  Everything must be identical to the original when repairs are made.  Lots of oxygen free stuff.  And they do indeed love
572 tubes.  
Groovy dawg
Allen



Yep, air-core transformers for single-ended output stages get pricey fast, and anything 300B-based commands a premium.

Part of why I ended up going with transmitting tubes for my stereo monoblocks - same output as 300Bs (8 watts) and a heck of a lot cheaper to re-tube. Thoriated tungsten cathodes last longer, too, and they look very cool at night Smiley

The ones that are getting hard to find is a lot of the pre-war triodes. Tubes like 26s & 56s are getting hard to find in non-microphonic shape, and unfortunately there are a lot of good, simple line stage and amp designs out there that use them. Same goes for NOS 6SN7s, because they've all been snapped up by audio geeks. I'm partial to the big octal-based stuff too, so I'm just as guilty as the rest.

But there'll be 12AU7s from now until we invent teleportation and colonize the Moon.
« Last Edit: October 05, 2011, 04:17:02 PM by KG4NEL » Logged
WA2AAR
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Posts: 88




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« Reply #10 on: October 05, 2011, 04:56:37 PM »

Hi I have a TL-922a Amp still has the original tubes in it. If you do not push the tubes they will las for ever.

Bob - WA2AAR
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W1QJ
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Posts: 1446




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« Reply #11 on: October 05, 2011, 05:02:37 PM »

Hi I have a TL-922a Amp still has the original tubes in it. If you do not push the tubes they will las for ever.

Bob - WA2AAR

OMG Bob, what is the filament voltage on that amp?
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W8JI
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Posts: 9296


WWW

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« Reply #12 on: October 05, 2011, 05:05:55 PM »

Hi I have a TL-922a Amp still has the original tubes in it. If you do not push the tubes they will las for ever.

Bob - WA2AAR

OMG Bob, what is the filament voltage on that amp?

Lew, shame on you.

Have you seen the emission tests I've been running? I keep adding to them.
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AG6K
Member

Posts: 1




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« Reply #13 on: October 05, 2011, 06:26:08 PM »

Hi I have a TL-922a Amp still has the original tubes in it. If you do not push the tubes they will las for ever.

Bob - WA2AAR

OMG Bob, what is the filament voltage on that amp?

Lew, shame on you.

Have you seen the emission tests I've been running? I keep adding to them.

  yea verily. 
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KA5ROW
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Posts: 500


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« Reply #14 on: October 05, 2011, 08:25:49 PM »

I would not worry about the 3-500z tube, they will last 30 years. If anything a retro fit to a ceramic tube is possible maybe a GI-7b.
A sign to look for is when Ameritron, QRO, and Ten-Tec all suddenly stop using the tube, like overnight.
That would be a sure sign the manufacture has notified them of the pending end of production.   
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