5Y3 tubes using different types???

corbymite · **Posted:** Apr Sun 22, 2012 6:26 am

I have heard that you should not replace 5y3 with 5y3G or 5y3GTA/B. As long as the radio does not use series filaments would it matter which type you use?

Corbymite :?:

yafan · **Posted:** Apr Sun 22, 2012 7:05 am

corbymite wrote:

I have heard that you should not replace 5y3 with 5y3G or 5y3GTA/B. As long as the radio does not use series filaments would it matter which type you use?

Corbymite :?:

The only difference between 5y3g and 5y3gt is the style of the glass bulb. If space permits, you can interchange them.
The ones with the ending suffix a/b usually indicate performance measurements (better quality) as in the case with 5y3gtb, it was used in aircraft computer equipment.

I don't believe there is a 5y3 metal type. If there is a metal-type tube, I hear that you have to ground the shell i think, at least they have a pin going to the shell in most cases.

35Z5 · **Posted:** Apr Sun 22, 2012 3:14 pm

5Y3 were not used in series sets, it's heater has to be powered from a separate transformer winding, it has the same electrical specs as the big pin type 80...

There have been rumors of a metal 5Y3, but I doubt they exist as least as a regular production type, a metal version was never registered with RMA/EIA...

Tom

Burnt Fingers · **Posted:** Apr Sun 22, 2012 4:35 pm

A 5Y3 was registered 6-6-35 which would have indicated metal, actual production unknown.

Carl

35Z5 · **Posted:** Apr Sun 22, 2012 5:23 pm

There is a 5Y3 listed in Tube Lore, and a 5Y3 in the RMA/EIA registrations but it's listed with a ST14 bulb, also lists 5Z4 as metal replacement... In the master index(where I first checked), Jim Cross lists the 6-6-35 registration as 5Y3G...

Tom

codefox · **Joined:** Nov Sat 27, 2010 6:15 pm **Posts:** 3597

Matters almost not. Later GT or GTA/B might be a little beefier, but for old radios it does not matter.

corbymite · **Posted:** Apr Mon 23, 2012 2:21 am

Thanks for all the replies! :!:

Pretty much what I hoped, "if you have it use it"

Corby

Burnt Fingers · **Posted:** Apr Mon 23, 2012 2:33 am

Quote:

In the master index(where I first checked), Jim Cross lists the 6-6-35 registration as 5Y3G...

I tend to go with Lud for reliable info.

35Z5 · **Posted:** Apr Mon 23, 2012 4:51 am

Burnt Fingers wrote:

Quote:

In the master index(where I first checked), Jim Cross lists the 6-6-35 registration as 5Y3G...

I tend to go with Lud for reliable info.

Not discounting Lud's work, but I'm looking at the original registration submitted by Arcturus that's dated 5/21/35 & registered 6/6/35 by the RMA... Possibly the lack of the G in the type was just an omission but if so, it was duplicated i several places...

BTW Jim Cross is the Chairman of TCA that Lud is President, his work documenting the RMA tube registrations came several years after Tube Lore was published...

http://www.tubecollectors.org/index.htm

Tom

Burnt Fingers · **Posted:** Apr Mon 23, 2012 9:54 pm

I know all that but Lud seems to be more up on the tech stuff and details from watching both of their postings.

Id call it a draw

Carl

5Y3 tubes using different types???

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