5Y3 with slow warm up input and output tubes

g(f(e)) · 8th March 2011, 10:55 PM

Hello,

I plan on using a 5Y3GT rectifier tube into a 10H choke. My driver tube is a 6SN7GTB and the output tube is 6V6GTA. Looking at one of the charts for the 6V6GTA it states an 11 sec warmup with series heaters and no warm up time with parallel connection. Would this be true also with the 6SN7GTB?

If not, what are the issues with a fast warm up rectifier with slow warm up driver and output tubes?

I have lots of all of these tubes and would prefer to use them if possible.

Thanks

Gary

kevinkr · 8th March 2011, 10:58 PM

Quote:

Originally Posted by g(f(e))

Hello,

I plan on using a 5Y3GT rectifier tube into a 10H choke. My driver tube is a 6SN7GTB and the output tube is 6V6GTA. Looking at one of the charts for the 6V6GTA it states an 11 sec warmup with series heaters and no warm up time with parallel connection. Would this be true also with the 6SN7GTB?

If not, what are the issues with a fast warm up rectifier with slow warm up driver and output tubes?

I have lots of all of these tubes and would prefer to use them if possible.

Thanks

Gary

No issues at all with this combination of tubes, just make sure that all supply capacitors are rated for the maximum voltage that will appear across them before the other tubes have fully warmed up and started to draw plate current.

g(f(e)) · 8th March 2011, 11:30 PM

Thanks for the quick reply.

I am using motor runs and they are rated for 440Vac. I am using a 350V - 350V transformer. That is what it measures unloaded, I have been a little concerned if they are rated high enough.

Eli Duttman · 8th March 2011, 11:40 PM

The minimum DC voltage your motor run caps. can tolerate continuously is 622 V. and they probably can take a bit more serving as filters instead of current carriers.

If you want to be "fanatic" you can try either the 6087 or 6106. They are 5Y3 variants with cathode sleeves.

HollowState · 8th March 2011, 11:42 PM

Even though there are no issues with these tubes, you could go for an industrial version of the 5Y3 that is a slow warming indirectly heated cathode. The GE type 6087. A bit hard to find and expensive, but a great tube.

8th March 2011, 10:55 PM	#1
g(f(e)) diyAudio Member Join Date: Dec 2007	5Y3 with slow warm up input and output tubes Hello, I plan on using a 5Y3GT rectifier tube into a 10H choke. My driver tube is a 6SN7GTB and the output tube is 6V6GTA. Looking at one of the charts for the 6V6GTA it states an 11 sec warmup with series heaters and no warm up time with parallel connection. Would this be true also with the 6SN7GTB? If not, what are the issues with a fast warm up rectifier with slow warm up driver and output tubes? I have lots of all of these tubes and would prefer to use them if possible. Thanks Gary

8th March 2011, 11:40 PM	#4
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	The minimum DC voltage your motor run caps. can tolerate continuously is 622 V. and they probably can take a bit more serving as filters instead of current carriers. If you want to be "fanatic" you can try either the 6087 or 6106. They are 5Y3 variants with cathode sleeves. __________________ Eli D.

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8th March 2011, 11:30 PM	#3
g(f(e)) diyAudio Member Join Date: Dec 2007	Thanks for the quick reply. I am using motor runs and they are rated for 440Vac. I am using a 350V - 350V transformer. That is what it measures unloaded, I have been a little concerned if they are rated high enough.

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