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Old 27th July 2011, 03:41 AM   #1
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Default 6EZ5 as drop in replacement for 6V6 tube?

Hello people!

I know that their heater current requirements are almost double that of a 6V6 tube?
But at 99 cents per tube (NOS/NIB RCA 6EZ5), it was too good a deal to walk away from?
Is there anything else I need to know, before trying them out??

Steve
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Old 27th July 2011, 05:25 AM   #2
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Originally Posted by leadbelly View Post
Oh, I know this game! The title I pick is: "Megan Fox stalking me?"
What kind of a bizarre response it that? What have you been smoking tonight?

Steve,
If your filament supply has the reserve juice, go ahead and try them. Everything else like plate/screen voltage, bias, plate resistance, transconductance & dissipation look close enough for audio. Only other difference is that it's a beam tetrode compared to a true pentode. A slight bias adjustment might be necessary for the best operating point.
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Old 27th July 2011, 05:57 AM   #3
AJT is offline AJT  Philippines
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Quote:
Originally Posted by KrankKall View Post
Hello people!

I know that their heater current requirements are almost double that of a 6V6 tube?
But at 99 cents per tube (NOS/NIB RCA 6EZ5), it was too good a deal to walk away from?
Is there anything else I need to know, before trying them out??

Steve
hi, can you pm me the store haveing this $0.99deal? thanks...
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Old 27th July 2011, 12:36 PM   #4
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ESRC no longer has them on their dollar list. Vacuumtubes.net has them on their $1 list but they have none in stock. Too bad because in most places including my SSE board they will replace a 6V6. Some adjustment of the bias is needed.
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Old 27th July 2011, 02:19 PM   #5
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The 99 cent 6EZ5 tubes were from an e-bay vender.
He only had a few, and I bought them all.
At THAT price, why not buy them and at least try them out?
Sorry guys!

That bias adjustment mentioned, is that because cathode current is higher than a 6V6 tube?

THANKS!!
Steve
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Old 27th July 2011, 02:37 PM   #6
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Slightly different characteristics from the 6V6..
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Old 27th July 2011, 04:15 PM   #7
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That bias adjustment mentioned, is that because cathode current is higher than a 6V6 tube?......Slightly different characteristics from the 6V6..
The 6EZ5 has slightly different characteristics than a 6V6, that will cause a higher cathode current if you just plug it into a 6V6 socket. The 6EZ5 was designed for TV vertical sweep and it has a bigger cathode than the 6V6.
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Old 28th July 2011, 12:02 AM   #8
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Well, I'm assuming that since a 6EZ5 does have a bigger cathode than a 6V6 tube.
That is should be able to handle higher cathode current because of that, correct??
And as long as the power transformer (and rectifier) is beefy enough to supply the additional current requirements, then it shouldn't be a problem?

Am I correct on this.....or am I swinging at a ball out of the strike zone??

Steve
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Old 28th July 2011, 12:35 AM   #9
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^or you could work into lower voltages for the same power, makes your tube last longer......
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Old 28th July 2011, 01:07 AM   #10
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Quote:
Originally Posted by KrankKall View Post
Well, I'm assuming that since a 6EZ5 does have a bigger cathode than a 6V6 tube.
That is should be able to handle higher cathode current because of that, correct??
And as long as the power transformer (and rectifier) is beefy enough to supply the additional current requirements, then it shouldn't be a problem?

Am I correct on this.....or am I swinging at a ball out of the strike zone??

Steve
In addition to previous comments about things to check you also need to check that the transformer can handle the increased current and audio output power linearly, and that the plate dissipation is not excessively exceeded - no glowing plate spots..
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