Author Topic: how much voltage can old 6P14P tubes take?  (Read 1274 times)

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Offline ELS122Topic starter

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how much voltage can old 6P14P tubes take?
« on: February 06, 2020, 02:00:56 am »
I know that they are claimed to only hold 250volts anode voltage. but I've seen more than that in a LOT of amps.
usually about 265v
so I wanted to have 360v on the plate but I am sure it will arc over in the tube.
so what would be the max voltage it can take really and what will be the consequences of using such high voltage?

also, I know that new 6P14P tubes can usually hold a lot more voltage since they're better quality.
so what can a new 6P14P tube hold?

also, 6P1P tubes are basically 6P14P 2.0 so can they hold more voltage? they are claimed to only hold 250v same as the 6P14P's but they are better in most other ways so it might be just underrated?

oh and 6P14P tubes are a Russian copy of EL84's with a 6V heater, and the 6P1P's are Russian copies of EL90 tubes.
 

Offline amyk

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Re: how much voltage can old 6P14P tubes take?
« Reply #1 on: February 06, 2020, 02:16:55 am »
According to https://www.hobbielektronika.hu/forum/getfile.php?id=21127 , absolute max of 300-400V, but it's hard to give a concrete answer because you're essentially asking "what's the distribution of maximum anode voltages and the manufacturing process variation".
 
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Offline gbaddeley

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Re: how much voltage can old 6P14P tubes take?
« Reply #2 on: February 08, 2020, 08:14:50 am »
Not sure why you would want 360V on the plate, as that is outside it’s normal operating range. Performance will be pitiful in a number of aspects.
Glenn
 

Offline Kirill V.

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Re: how much voltage can old 6P14P tubes take?
« Reply #3 on: February 08, 2020, 07:16:47 pm »
I know that they are claimed to only hold 250volts anode voltage. but I've seen more than that in a LOT of amps.
usually about 265v
Excess voltage drop on the anode load, probably.
An important parameter is the power dissipated at the anode. An increased anode voltage is dangerous by a breakdown between the electrodes. Since this pentode is intended for output stages of household audio equipment, I would not count on the ability to tolerate high voltages.
 


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