Hytron big 71A

Diy martin · 11th April 2006, 07:59 PM

Hello Diy members,

I have bought a nice and strange pair of 71A tubes on Evilbay.
I made a picture of a normal nikkel plate 71A and the Hytron blackplate .Now I am looking for some data about this big Hytron.
They test on the weak site but the same on my 177 tester, so I think they are a bit different than the normel one because the tubes are N.O.S

i_should_coco · 11th April 2006, 08:15 PM

Looks more like a VT-52. Does it have any markings?

Diy martin · 11th April 2006, 08:28 PM

Hello,

On the glass envelope is the orginal 71A mark ,on both tubes.

Thanks for your reply.

Martin.

i_should_coco · 11th April 2006, 11:04 PM

Fair enough! Never seen one like that before.

Big brute for a 71A.

Rocky · 12th April 2006, 12:15 AM

Never seen a 71A like that before. Tell us what you find out, I use 71A and would be especially curious about those big bulbs of yours... Could it perhaps be they arent 71A at all, but simply have the wrong marking?? Never seen that happen before either, but they sure don't look like 71A.

jlsem · 12th April 2006, 02:03 PM

If it's mismarked the filament voltage used to test is too low. I have seen tubes mismarked on the glass as well as the base, e.g. I had a 6A3 that had 5Z3 etched on the glass. It sure looks like a VT-52.

John

Diy martin · 12th April 2006, 06:26 PM

Here are some more pictures of the Hytron tube.

Thanks for your reply.

Diy martin · 12th April 2006, 06:29 PM

And another one,

Diy martin · 12th April 2006, 06:31 PM

And another one

testlab · 12th April 2006, 07:49 PM

Datasheet here

http://frank.pocnet.net/sheets/021/7/71A.pdf

11th April 2006, 08:28 PM	#3
Diy martin diyAudio Member Join Date: Apr 2003 Location: papendrecht	Hytron 71A Hello, On the glass envelope is the orginal 71A mark ,on both tubes. Thanks for your reply. Martin.

12th April 2006, 07:49 PM	#10
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	Datasheet here http://frank.pocnet.net/sheets/021/7/71A.pdf __________________ It's not whether you win or lose, it's how you lay the blame.

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11th April 2006, 08:15 PM	#2
i_should_coco diyAudio Member Join Date: Dec 2003 Location: Surrey, UK	Looks more like a VT-52. Does it have any markings?

11th April 2006, 11:04 PM	#4
i_should_coco diyAudio Member Join Date: Dec 2003 Location: Surrey, UK	Fair enough! Never seen one like that before. Big brute for a 71A.

12th April 2006, 12:15 AM	#5
Rocky diyAudio Member Join Date: Apr 2004 Location: Kongsberg/Oslo	Never seen a 71A like that before. Tell us what you find out, I use 71A and would be especially curious about those big bulbs of yours... Could it perhaps be they arent 71A at all, but simply have the wrong marking?? Never seen that happen before either, but they sure don't look like 71A.

12th April 2006, 02:03 PM	#6
jlsem diyAudio Member Join Date: Jun 2003 Location: Dallas,TX	If it's mismarked the filament voltage used to test is too low. I have seen tubes mismarked on the glass as well as the base, e.g. I had a 6A3 that had 5Z3 etched on the glass. It sure looks like a VT-52. John

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