Tubes
Posted: Thu Dec 29, 2011 10:57 pm
Can anyone tell me is there a difference between a 5y3 tube and a 5y3gt tube, also should i get N.O.S. or just get new ones. if so what kind
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Tubes
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Re: Tubes
Posted: Fri Dec 30, 2011 1:41 am
If your unit calls for a "GT", you should not use a "plain" 5Y3. If your unit calls for a 5Y3G, you may use the "GT"--In other words, the newer tubes have suffix numbers, and usually can be sub'ed for the older tubes. I believe the "G" stands for "glass"--don't know what the "T" is for---As for NOS, vs. new--that's a "toss-up", I never worry about, with the exception that I won't purchase tubes made in China.-- Ron Rich
Re: Tubes
Posted: Fri Dec 30, 2011 7:17 am
Thanks so much, Tubedepo here i come.... 
Re: Tubes
Posted: Fri Dec 30, 2011 9:23 am
Ron Rich wrote:If your unit calls for a "GT", you should not use a "plain" 5Y3. If your unit calls for a 5Y3G, you may use the "GT"--In other words, the newer tubes have suffix numbers, and usually can be sub'ed for the older tubes. I believe the "G" stands for "glass"--don't know what the "T" is for---As for NOS, vs. new--that's a "toss-up", I never worry about, with the exception that I won't purchase tubes made in China.-- Ron Rich
You'll never catch a chinese tube in any of my sets either, Ron.
Oh and Ron, perhaps this might help:
A 5Y3G is a glass-encased "shoulder style" tube.
A 5Y3GT is a glass-encased "straight tubular" version.
The 5Y3GTA or "B" is an improved version - better power rating.
Re: Tubes
Posted: Fri Dec 30, 2011 6:48 pm
Matt,
Thanks--I had forgotten what the "T" was--BTW-- I think --if memory serves me well--a 5Y3, is a metal envelope, if my great, but not too long memory, serves me well-- Ron Rich
Thanks--I had forgotten what the "T" was--BTW-- I think --if memory serves me well--a 5Y3, is a metal envelope, if my great, but not too long memory, serves me well-- Ron Rich
Re: Tubes
Posted: Fri Jan 06, 2012 6:25 am
The GTA and GTB series are tubes built with a fixed warm up time.
In the old sets with tube filaments wired in series, if the tubes warmed up at different rates, the tube that warmed up first would get an overvoltage until the other tubes warmed up. That tube would burn out more frequently than the others. So they started designing tubes with a fixed warmup time: 11 seconds.
In the old sets with tube filaments wired in series, if the tubes warmed up at different rates, the tube that warmed up first would get an overvoltage until the other tubes warmed up. That tube would burn out more frequently than the others. So they started designing tubes with a fixed warmup time: 11 seconds.