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What do your meters normally read? (Read 8465 times)
Finch
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What do your meters normally read?
10/23/17 at 00:38:37
 
What mA do you expect with a 6P15P-EB?

How do these meters work? Does the input tube affect the output?

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Rega RP6- ZP3- macmini- Benchmark Dac2 HGC- Torii mkii/ SE84 UFO2- MG944/DNA
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Tripwr1964
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Re: What do your meters normally read?
Reply #1 - 10/27/17 at 17:19:00
 
mine sit at around 36 mA.
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Martindfletcher
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Re: What do your meters normally read?
Reply #2 - 11/12/17 at 06:09:42
 
Mine are same as trip.
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Finch
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Re: What do your meters normally read?
Reply #3 - 11/13/17 at 05:16:40
 
Thanks, I saw a picture somewhere with the meters over 40. Mine are 36 with the stock tubes too.
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Rega RP6- ZP3- macmini- Benchmark Dac2 HGC- Torii mkii/ SE84 UFO2- MG944/DNA
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Steve Deckert
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If the 1st watt
sucks why continue?

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Re: What do your meters normally read?
Reply #4 - 11/17/17 at 03:09:56
 
The mA reading on a UFO2 with 6N1P-EB tubes range from 20~40, the majority landing around 24 mA.  It depends on the tubes themselves.  Interestingly, with this tube, there does not seem to be a real difference in sound or power output between one that reads 20 vs. one that reads 30, so the more important reading is that of similarity.  Whatever one tube reads, ideally the other should also read.  If they are different beyond 5 mA there is usually a channel imbalance.

Steve
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AlexR
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Re: What do your meters normally read?
Reply #5 - 03/08/20 at 02:06:37
 
I've been wondering if it's time for new output tubes. If my meters are reading their typical 26 mA, can I assume they're still good? Or is this not a way to determine if tubes need to be replaced?
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Steve Deckert
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If the 1st watt
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Re: What do your meters normally read?
Reply #6 - 03/08/20 at 16:13:01
 

Hi Alex,

The meters are measuring current, which does not change much over the life of the tube.  Transconductance is the measure of lifespan and sadly the meters do not give any real indication of transconductance.

The best way to tell if your tubes need replaced, is to replace them with new and see if you can hear a difference.  If the tube is past its prime, you will hear it because it will sound diminished.

Steve
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AlexR
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Re: What do your meters normally read?
Reply #7 - 03/08/20 at 18:37:12
 
Thanks for the info, Steve. Much appreciated!
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