Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Sep Sat 22, 2018 12:36 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 30 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 4:39 am 
Member
User avatar

Joined: May Sun 13, 2012 8:12 pm
Posts: 11170
Location: Central PA 16801
thanks

steve

_________________
I am not responsible for any damage, injury, or death from any content / advice in this thread.


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 5:40 am 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 10117
Location: Powell River BC Canada
5U4 The old reference to a line of 117 volts in the RCA manual
speaks volumes.



Attachment:
5U4.jpg
5U4.jpg [ 48.77 KiB | Viewed 97 times ]
Attachment:
5U4 i.jpg
5U4 i.jpg [ 177.09 KiB | Viewed 97 times ]
Attachment:
5U4  G  ii   117 volt power line note.jpg
5U4 G ii 117 volt power line note.jpg [ 141.97 KiB | Viewed 97 times ]
Attachment:
5U4 G iii  117 note.jpg
5U4 G iii 117 note.jpg [ 166.32 KiB | Viewed 97 times ]

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Last edited by radiotechnician on Jul Thu 12, 2018 6:10 am, edited 2 times in total.

Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 5:50 am 
Member
User avatar

Joined: Nov Sun 22, 2015 9:07 pm
Posts: 550
Location: Chicago, IL
Greetings!

Thanks for all the info here, I learned quite a bit and mainly found out what I suspected, that the newer tubes a lot of times aren't as robust and won't handle the maximum ratings of the NOS American made tubes. I also found out about European tubes using different size pins than American tubes. I don't know why, I wish they all were a standard! That's one thing I never understood, is how in the modern world, nothing can be standardized. The US uses 110-120 volts AC to homes, while other countries are 220-240 mains voltage. The US uses the standard measurement system, and everywhere else is metric. Different electrical sockets in different countries. Stuff like that.

I also wonder how difficult it would be some day to reproduce common eye tubes, such as the 6E5 or 1629. Obviously money and demand is a factor, but I wonder if eventually there would be a point where it would be reasonable to get some remanufactured again, even in fairly small quantities, as seemingly the prices of NOS eye tubes will continue to rise and will get scarcer.

-Dylan, CT101


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 6:43 am 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 10117
Location: Powell River BC Canada
When tubes were being manufactured for electronics prior to transistors,
a sole tube making plant depended on a vast network of suppliers of the
chemicals and special metals needed. These industries vanished when
tube production ceased since there was no longer a market for what
they made. (buggy whips) .

To make tubes that lasted standards for tube parts were established.

Tube making reached a pinnacle when factories were phased out.

It may be that the technology was simply given away.

A strategic reason may have been others (competition/enemy)
to grab it up and continue thermionics rather than setting
up solid state research of their own.

Below is part of a standard for making standard tubes to test
materials needed to make specific groups of tubes.
Attachment:
astm11 66  322 p8.jpg
astm11 66 322 p8.jpg [ 247.43 KiB | Viewed 96 times ]

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 2:25 pm 
Member

Joined: Aug Sat 02, 2014 3:59 am
Posts: 1058
Location: Brooklyn, NY 11217
Here is the production of the $1000+ new tubes. https://vinylsavor.blogspot.com/search/label/ELROG New WE tubes will be out soon. Only $1400 each... The cost of the eye tubes would be the same or more I am sure. LED replacements are more likely. I just don't have the engineering background to think it through...


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 6:07 pm 
Member
User avatar

Joined: Nov Sun 22, 2015 9:07 pm
Posts: 550
Location: Chicago, IL
Wow! Yeah that's what I figured, it would cost quite a bit considering these new tubes go for such money.. I find it ridiculous myself, but I understand that since it's such a small market for them they will be more expensive to produce and people will pay for them since they need them for their amps. It's interesting to see how they are produced, though. I have seen some hobbyists on YouTube make their own tubes using their own equipment, and I wonder how hard it would be to produce an eye tube. The problem would be getting a good source of phosphor for the targets/getting the targets made, and getting getters too.

-Dylan, CT101


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 7:03 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 19043
Location: Warner Robins, GA
CrankTelephone101 wrote:
and people will pay for them since they need them for their amps.
-Dylan, CT101


Which is why those tubes are so expensive.

Simple marketing. Have a product that someone needs and if no competition set the price to whatever you want and people will pay.


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 7:21 pm 
Member
User avatar

Joined: Nov Sun 22, 2015 9:07 pm
Posts: 550
Location: Chicago, IL
Tube Radio wrote:
CrankTelephone101 wrote:
and people will pay for them since they need them for their amps.
-Dylan, CT101


Which is why those tubes are so expensive.

Simple marketing. Have a product that someone needs and if no competition set the price to whatever you want and people will pay.

Exactly! They know people need the tubes and that they would be willing to pay whatever their prices are to get them since there isn't any competition. Something is only worth what someone will pay for it!


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 9:04 pm 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 10117
Location: Powell River BC Canada
Some tubes licensed for radio telegraph came with a pro rated guarantee
form inside the box. The station engineer filled out the exact details of how
the tube was used and sent it back.

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: Opinions on new production tubes
PostPosted: Jul Thu 12, 2018 9:25 pm 
Member
User avatar

Joined: May Sun 13, 2012 8:12 pm
Posts: 11170
Location: Central PA 16801
this is the only time i have ever used new production tubes in nearly 40 years for the obvious reasons. fortunately, i have an excellent stock of NOS and used/good tubes.

i used new production tubes in this motorola for reasons in this order.

1. the price of NOS and even used/good 6BQ5/EL84 tubes is out of control.

2. i don't want to touch my stash.

3. JJ is a highly recommended and reliable brand for new production tubes.

4. these were used and burned in for about a year within normal parameters in an organ. if they were to mess the bed from a premature defect, it is likely that they would have done so already.

5. these tubes are not pushed and are run at 80% of the max in my motorola amplifier.

6. they were basically free--a trade off for testing two handfuls of tubes for a good friend.

viewtopic.php?f=1&t=341427

steve


Attachments:
SAM_3595.JPG
SAM_3595.JPG [ 162.18 KiB | Viewed 72 times ]

_________________
I am not responsible for any damage, injury, or death from any content / advice in this thread.
Top
 Profile  
 
Post New Topic Post Reply  [ 30 posts ]  Go to page Previous  1, 2

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests



Search for:
Jump to:  
























Privacy Policy :: Powered by phpBB