La Radiotechnique 12AX7S HF 6727 - FRS - 67024 - Tube?

[Ivo Conceicao]

Hi all, I hope to find you safe.

I have here some Tubes "La Radiotechnique 12AX7S HF 6727 - FRS - 67024" NOS in Box, I need to know something about them. Does anyone know of a website with their features? Does anyone know their price per unit?

Thanks in advance
Kindest regards

 

[56085]

It has the same electrical parameters as the 12AX7/ECC83, but is made to better handle shock/vibrations (for aeronautical and industrial applications). It also has a heater that can be lit and extuingished atleast 5000 times.

 

[Ivo Conceicao]

It has the same electrical parameters as the 12AX7/ECC83, but is made to better handle shock/vibrations (for aeronautical and industrial applications). It also has a heater that can be lit and extuingished atleast 5000 times.

Thank you very much for your wisdom and answer, I appreciate it very much!

Do they have 3 silver mica plates? I have some matched pairs, can you tell me their value?

thanks again
kindest regards
Ivo Conceição

 

[Steve Morley]

$1 each, but since I'm a generous guy $2 each. 🙂 I'll pay for the shipping too.

S.

 

[56085]

Do they have 3 silver mica plates? I have some matched pairs, can you tell me their value?

I wouldn't know. What I wrote comes straight out of the datasheets.

 

[Steve Morley]

But seriously, a quick surf through a couple of US tube vendors shows virtually no new 12AX7 (or equivalents) in stock. NOS European tubes are selling for silly money. If you are looking to sell you could get as high as $100 each if you pick the right place to sell them. You would need to assure potential buyers that they have been properly tested. If you have many, say 25 or more, a tube dealer might be interested in buying them, but you would of course get less for them that way.

S.

 

[Ivo Conceicao]

Thanks again guys! Awesome info! Take care 😎 Regards. Ivo

 

[Steve Morley]

Have a look for the type and date codes etched on the glass. Search: Philips tube date codes Here are just a few examples:

http://www.tube-classics.de/TC/Tubes/Valvo/Phlipscode.htm.

https://mullard.org/blogs/news/mullard-valve-etched-codes-how-to-interpret-them

https://tubes4hifiaudio.nl/tube-testing-quality-control/philips-etceteras-date-codes/

 

[Ivo Conceicao]

Thanks a lot again guys! All necessary info, you rock.
Take care.
Kindest regards
Ivo

 

[astouffer]

But seriously, a quick surf through a couple of US tube vendors shows virtually no new 12AX7 (or equivalents) in stock. NOS European tubes are selling for silly money. If you are looking to sell you could get as high as $100 each if you pick the right place to sell them. You would need to assure potential buyers that they have been properly tested. If you have many, say 25 or more, a tube dealer might be interested in buying them, but you would of course get less for them that way.

S.

I have a drawer full of 12AX7s that are good pulls. Maybe it's time to eBay them.

 

[Kay Pirinha]

Your tubes apparently once were meant for public authority or military supply. The tube plant of La Radiotechnique in Chartres, France, was a subsidiary within the big Philips group. So you've found some true gems 😉.

Best regards!